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Journal articles on the topic 'Topography polypeptides'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Dubreuil, R. R., T. K. Rosiere, M. C. Rosner, and G. B. Bouck. "Properties and topography of the major integral plasma membrane protein of a unicellular organism." Journal of Cell Biology 107, no. 1 (1988): 191–200. http://dx.doi.org/10.1083/jcb.107.1.191.

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The cellular distribution, membrane orientation, and biochemical properties of the two major NaOH-insoluble (integral) plasma membrane proteins of Euglena are detailed. We present evidence which suggests that these two polypeptides (Mr 68 and 39 kD) are dimer and monomer of the same protein: (a) Antibodies directed against either the 68- or the 39-kD polypeptide bind to both 68- and 39-kD bands in Western blots. (b) Trypsin digests of the 68- and 39-kD polypeptides yield similar peptide fragments. (c) The 68- and 39-kD polypeptides interconvert during successive electrophoresis runs in the pre

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2

Marr, Kathleen M., and Mary K. Lyon. "Characterization of photosystem II with the atomic-force microscope." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1146–47. http://dx.doi.org/10.1017/s0424820100130365.

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Photosystem II (PSII) is different from all other reaction centers in that it splits water to evolve oxygen and hydrogen ions. This unique ability to evolve oxygen is partly due to three oxygen evolving polypeptides (OEPs) associated with the PSII complex. Freeze etching on grana derived insideout membranes revealed that the OEPs contribute to the observed tetrameric nature of the PSIl particle; when the OEPs are removed, a distinct dimer emerges. Thus, the surface of the PSII complex changes dramatically upon removal of these polypeptides. The atomic force microscope (AFM) is ideal for examin

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3

Clarkson, G. H. D., J. Neagle, and J. G. Lindsay. "Topography of succinate dehydrogenase in the mitochondrial inner membrane. A study using limited proteolysis and immunoblotting." Biochemical Journal 273, no. 3 (1991): 719–24. http://dx.doi.org/10.1042/bj2730719.

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The arrangement of the large (70,000-Mr) and small (30,000-Mr) subunits of succinate dehydrogenase in the mitochondrial inner membrane was investigated by immunoblot analysis of bovine heart mitochondria (right-side-out, outer membrane disrupted) or submitochondrial particles (inside-out) that had been subjected to surface-specific proteolysis. Both subunits were resistant to proteinase treatment provided that the integrity of the inner membrane was preserved, suggesting that neither subunit is exposed at the cytoplasmic surface of the membrane. The bulk of the small subunit appears to protrud

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4

Takemoto, J. Y., R. L. Peterson, M. H. Tadros, and G. Drews. "Transverse membrane topography of the B875 light-harvesting polypeptides of wild-type Rhodobacter sphaeroides." Journal of Bacteriology 169, no. 10 (1987): 4731–36. http://dx.doi.org/10.1128/jb.169.10.4731-4736.1987.

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5

Costa, Rui R., Artur J. Ribeiro, José C. Rodríguez-Cabello, and João F. Mano. "Nanostructured Thin Coatings from Chitosan and an Elastin-Like Recombinamer with Acute Stimuli-Responsive Behavior." Materials Science Forum 730-732 (November 2012): 32–37. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.32.

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In the present work, chitosan (CHI) and elastin-like recombinamers (ELRs) were used to conceive nanostructured thin films driven by sequential electrostatic layer-by-layer (LbL), a simple and versatile technique that discards the use of harmful reagents. Two similar ELRs were engineered to contain negatively charged aminoacids and organized and a single monoblock or a triblock. The buildup of the films was monitored in real time using a quartz-crystal microbalance with dissipation monitoring (QCM-D). Wettability transitions were observed from a moderate hydrophobic surface to an extremely wett

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6

D'Andrea, Paola, Deborah Civita, Michela Cok, et al. "Myoblast Adhesion, Proliferation and Differentiation on Human Elastin-Like Polypeptide (HELP) Hydrogels." Journal of Applied Biomaterials & Functional Materials 15, no. 1 (2017): 43–53. http://dx.doi.org/10.5301/jabfm.5000331.

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Background The biochemical, mechanical and topographic properties of extracellular matrix are crucially involved in determining skeletal muscle cell morphogenesis, proliferation and differentiation. Human elastin-like polypeptides (HELPs) are recombinant biomimetic proteins designed to mimic some properties of the native matrix protein; when employed as myoblast adhesion substrates, they stimulate in vitro myogenesis. Given the influence that the biophysical properties of extracellular matrix have on skeletal muscle cells, the aim of this work was to investigate the effects of HELP hydrogels o

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Watanabe, M., A. L. Frelinger, and U. Rutishauser. "Topography of N-CAM structural and functional determinants. I. Classification of monoclonal antibody epitopes." Journal of Cell Biology 103, no. 5 (1986): 1721–27. http://dx.doi.org/10.1083/jcb.103.5.1721.

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12 distinct neural cell adhesion molecule (N-CAM) epitopes, each recognized by a different monoclonal antibody (mAb), have been characterized in terms of the major structural and functional features of the molecule. Seven antibodies, each recognizing the amino-terminal region of the molecule, altered the rate of N-CAM-mediated adhesion. Four of these were inhibitors, two of which also recognized a heparin-binding N-CAM fragment. The other three antibodies specifically enhanced the rate of N-CAM-mediated adhesion. Three epitopes, one polypeptide- and two carbohydrate-dependent, were associated

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Ferl, R. J. "Discontinuities in the topography of alcohol dehydrogenase-sodium dodecyl sulphate complexes revealed by mutagenesis and proteolysis." Biochemical Journal 226, no. 3 (1985): 853–58. http://dx.doi.org/10.1042/bj2260853.

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Experiments utilizing proteolytic mapping of maize Alcohol dehydrogenase-1 protein (EC 1.1.1.1; ADH) showed that, in the presence of sodium dodecyl sulphate (SDS), two discrete areas of the protein molecule were hypersensitive to digestion with Staphylococcus aureus V8 proteinase. These areas were mapped to points 11 and 27 kDa along the 41 kDa polypeptide. Furthermore, ADH1 proteins isolated from the ethyl methanesulphonate-induced mutants U725 and W586 showed both a change in electrophoretic mobility in SDS gels, and an altered V8 proteinase digestion pattern. Protein from U725 migrated in S

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9

Kumar Mandal, Tapas. "Electron Microscopic study of the polymyxin treated vibrio cholerae cells." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 3 (1990): 642–43. http://dx.doi.org/10.1017/s0424820100160765.

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Infections by Vibrio Cholerae (a gram-negative bacterial organism) in the Indian subcontinent are frequently encoutered. The polypeptide antibiotic polymyxin-B (PB) is a clinically important antibiotic which is used to treat infections caused by a number of gr am-negative bacteria. It has been observed that PB causes disruption of u U1rastructure of outer membrane (OW) , as revealed by the electron microscopic studies for a number of bacteria, through the formation of blebs and crenations (finger-like structures) on the OM . In this context, it is relevant to look specifically at the morpholog

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10

Bakos, M. A., A. Kurosky, C. S. Woodard, R. M. Denney, and R. M. Goldblum. "Probing the topography of free and polymeric Ig-bound human secretory component with monoclonal antibodies." Journal of Immunology 146, no. 1 (1991): 162–68. http://dx.doi.org/10.4049/jimmunol.146.1.162.

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Abstract Secretory component (SC), an integral membrane protein expressed on basolateral surfaces of secretory epithelial cells, mediates the transport of polymeric Ig (PIg) into external secretions. The ectoplasmic segment of SC is released into secretions either in a free form (FSC) or bound to PIg as secretory IgA or IgM. The topography of human SC in its free and PIgA-bound form was studied by using mAb directed against each form of SC. Competition experiments identified a minimum of nine SC epitopes, one of which was dependent on an N-glycosidic moiety. Three of the polypeptide-derived ep

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Weaver, Dylan R., and Gavin M. King. "Atomic Force Microscopy Reveals Complexity Underlying General Secretory System Activity." International Journal of Molecular Sciences 24, no. 1 (2022): 55. http://dx.doi.org/10.3390/ijms24010055.

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The translocation of specific polypeptide chains across membranes is an essential activity for all life forms. The main components of the general secretory (Sec) system of E. coli include integral membrane translocon SecYEG, peripheral ATPase SecA, and SecDF, an ancillary complex that enhances polypeptide secretion by coupling translocation to proton motive force. Atomic force microscopy (AFM), a single-molecule imaging technique, is well suited to unmask complex, asynchronous molecular activities of membrane-associated proteins including those comprising the Sec apparatus. Using AFM, the dyna

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12

Cole, G. J., A. Loewy, N. V. Cross, R. Akeson, and L. Glaser. "Topographic localization of the heparin-binding domain of the neural cell adhesion molecule N-CAM." Journal of Cell Biology 103, no. 5 (1986): 1739–44. http://dx.doi.org/10.1083/jcb.103.5.1739.

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Previous studies have reported that the cell-binding region of the neural cell adhesion molecule (N-CAM) resides in a 65,000-D amino-terminal fragment designated Frl (Cunningham, B. A., S. Hoffman, U. Rutishauser, J. J. Hemperly, and G. M. Edelman, 1983, Proc. Natl. Acad. Sci. USA, 80:3116-3120). We have reported the presence of two functional domains in N-CAM, each identified by a specific mAb, that are required for cell-cell or cell-substratum adhesion (Cole, G. J., and L. Glaser, 1986, J. Cell Biol., 102:403-412). One of these domains is a heparin (heparan sulfate)-binding domain. In the pr

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13

Pamir, Nathalie, Francis C. Lynn, Alison M. J. Buchan, et al. "Glucose-dependent insulinotropic polypeptide receptor null mice exhibit compensatory changes in the enteroinsular axis." American Journal of Physiology-Endocrinology and Metabolism 284, no. 5 (2003): E931—E939. http://dx.doi.org/10.1152/ajpendo.00270.2002.

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The incretins glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) are gut hormones that act via the enteroinsular axis to potentiate insulin secretion from the pancreas in a glucose-dependent manner. Both GLP-1 receptor and GIP receptor knockout mice ( GLP-1R−/−and GIPR−/−, respectively) have been generated to investigate the physiological importance of this axis. Although reduced GIP action is a component of type 2 diabetes, GIPR-deficient mice exhibit only moderately impaired glucose tolerance. The present study was directed at investigating possible compen

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14

Johnson, R. J., J. D. Tamerius, and D. E. Chenoweth. "Identification of an antigenic epitope and receptor binding domain of human C5a." Journal of Immunology 138, no. 11 (1987): 3856–62. http://dx.doi.org/10.4049/jimmunol.138.11.3856.

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Abstract Nine different murine anti-human C5a monoclonal antibodies have been produced and characterized. They exhibit Kas for the 125I-labeled ligand that range from 0.4 to 48 X 10(8) M-1, and they display limited cross-reactivity with C5a from other species. Each of these antibodies has been found to compete with the granulocyte C5a receptor for binding site(s) on the C5a polypeptide. Exploration of the antigenic topography of C5a revealed that the immunodominant portion of this glycopolypeptide resides between residues Lys20 and Arg37, with the area surrounding Cys27 being particularly impo

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15

Rahman, S., and W. H. Evans. "Topography of connexin32 in rat liver gap junctions. Evidence for an intramolecular disulphide linkage connecting the two extracellular peptide loops." Journal of Cell Science 100, no. 3 (1991): 567–78. http://dx.doi.org/10.1242/jcs.100.3.567.

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A range of anti-peptide antibodies directed towards selected amino acid sequences of connexin32 was prepared and characterised. The site-directed antibodies that identified connexin32 were used to study by immunolocalization and by proteolytic treatment of intact and split gap junctions the arrangement of the protein in the membrane. These studies reinforce models of connexin topography in which the polypeptide traverses the junctional membrane four times, with the amino and carboxyl termini cytoplasmically located. The four transmembrane domains were shown to be linked by two extracellular lo

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16

Müller, Daniel J., and Andreas Engel. "Structure, Flexibility and Intramolecular Forces Observed on Individual Proteins Using Afm." Microscopy and Microanalysis 5, S2 (1999): 996–97. http://dx.doi.org/10.1017/s1431927600018304.

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Atomic force microscopy (AFM) allows the surfaces of native biological macromolecules to be imaged in aqueous solution with submolecular resolution. Short range forces govern the interactions between the AFM tip and the sample and produce the submolecular information of high resolution topographs. In contrast, the long range electrostatic double-layer (EDL) force can be adjusted by pH and electrolytes to distribute the force applied to the AFM tip over a large sample area [1]. As demonstrated on fragile biological samples, adjustment of the electrolyte solution results in a local reduction of

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17

Gulevskyy, O. K. "URRENT CONCEPT OF THE STRUCTURAL AND FUNCTIONAL PROPERTIES OF ALFA-FETOPROTEIN AND THE POSSIBILITIES OF ITS CLINICAL APPLICATION." Biotechnologia Acta 14, no. 1 (2021): 25–37. http://dx.doi.org/10.15407/biotech14.01.025.

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This paper was aimed to review the literature data from native and foreign sources accumulated for 40-years period of research of the features of the molecular structure, functions, production and application of human alpha-fetoprotein (AFP), which is known as one of the most studied and increasingly demanded proteins. Results of fundamental studies performed with the use of modern methods, including various types of electrophoresis, chromatography, electron microscopy and immunoassay, in order to characterize the principal physicochemical capacities and localization of free and bound forms of

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18

Poulter, L., J. P. Earnest, R. M. Stroud, and A. L. Burlingame. "Structure, oligosaccharide structures, and posttranslationally modified sites of the nicotinic acetylcholine receptor." Proceedings of the National Academy of Sciences 86, no. 17 (1989): 6645–49. http://dx.doi.org/10.1073/pnas.86.17.6645.

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Using mass spectrometry, we have examined the transmembrane topography of the nicotinic acetylcholine receptor, a five-subunit glycosylated protein complex that forms a gated ion channel in the neuromuscular junction. The primary sequences of the four polypeptide chains making up the acetylcholine receptor from Torpedo californica contain many possible sites for glycosylation or phosphorylation. We have used liquid secondary ion mass spectrometry to identify posttranslationally modified residues and to determine the intact oligosaccharide structures of the carbohydrate present on the acetylcho

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19

Saccani Jotti, G., M. Fontanesi, A. Colombo, M. Valtolina, and A. Tardini. "Localization of Mucinous - like Carcinoma Associated Antigen (MCA) in Breast Pathology: Comparison with Carcinoembryonic Antigen (CEA) and Tissue Polypeptide Antigen (TPA)." International Journal of Biological Markers 5, no. 3 (1990): 145–52. http://dx.doi.org/10.1177/172460089000500308.

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The topographic distribution of a mucinous-like cancer antigen (MCA) recognized by a monoclonal antibody b-12 (MAb b-12) was assessed in benign (38) and malignant (66) breast tissues. The reactivity of MAb b-12 showed a good selectivity for breast tissues, reacting both with normal tissues and breast cancer. The degree of MCA expression was evaluated in the various groups of breast pathology adopting quantitative criteria of assessment. With the criteria of evaluation adopted, strong staining was observed in 71.4% breast carcinomas. The most positive reaction was demonstrated in mucinous carci

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20

Szafran, Klaudia, Małgorzata Jurak, Robert Mroczka, and Agnieszka Ewa Wiącek. "Surface Properties of the Polyethylene Terephthalate (PET) Substrate Modified with the Phospholipid-Polypeptide-Antioxidant Films: Design of Functional Biocoatings." Pharmaceutics 14, no. 12 (2022): 2815. http://dx.doi.org/10.3390/pharmaceutics14122815.

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Surface properties of polyethylene terephthalate (PET) coated with the ternary monolayers of the phospholipid 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), the immunosuppressant cyclosporine A (CsA), and the antioxidant lauryl gallate (LG) were examined. The films were deposited, by means of the Langmuir–Blodgett (LB) technique, on activated by air low temperature plasma PET plates (PETair). Their topography and surface chemistry were determined with the help of atomic force microscopy (AFM) and time-of-flight secondary ion mass spectrometry (TOF-SIMS), respectively, while wettability was e

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21

Lossow, Kristina, Irm Hermans-Borgmeyer, Wolfgang Meyerhof, and Maik Behrens. "Segregated Expression of ENaC Subunits in Taste Cells." Chemical Senses 45, no. 4 (2020): 235–48. http://dx.doi.org/10.1093/chemse/bjaa004.

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Abstract Salt taste is one of the 5 basic taste qualities. Depending on the concentration, table salt is perceived either as appetitive or aversive, suggesting the contribution of several mechanisms to salt taste, distinguishable by their sensitivity to the epithelial sodium channel (ENaC) blocker amiloride. A taste-specific knockout of the α-subunit of the ENaC revealed the relevance of this polypeptide for low-salt transduction, whereas the response to other taste qualities remained normal. The fully functional ENaC is composed of α-, β-, and γ-subunits. In taste tissue, however, the precise

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Szczepaniak, A., M. T. Black, and W. A. Cramer. "Topography of the Chloroplast Cytochrome b6: Orientation of the Cytochrome and Accessibility of the Lumen-Side Interhelix Loops." Zeitschrift für Naturforschung C 44, no. 5-6 (1989): 453–61. http://dx.doi.org/10.1515/znc-1989-5-619.

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Abstract The to pography of chloroplast cytochromes f and b6 was probed with proteases carboxypeptidase A (CpA ), trypsin, and Staph, aureus V8. The cytochrome and its proteolytic products were detected by heme stain and, in most experiments, by immunoreaction. In thylakoids, the only protease that significantly affected the intactness of cytochrome f was CpA that caused a small (ΔMr = -1 - 2000) decrease in the apparent molecular weight. In SDS -treated thylakoids, both trypsin and V8 degraded cytochrome f. The inferred topography of cytochrom f , with the COOH -terminus on the stromal (n) si

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23

Shmukler, B., T. Sun, C. Brugnara, and S. L. Alper. "Reinterpretation of the RACTK1 K+ channel." American Journal of Physiology-Cell Physiology 272, no. 1 (1997): C350—C354. http://dx.doi.org/10.1152/ajpcell.1997.272.1.c350.

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The RACTK1 cDNA cloned from rabbit kidney cortical collecting duct cells was associated with inwardly rectifying pH-regulated K+ channel activity (M. Suzuki, K. Takahashi, M. [keda, H Hayakawa, A. Ogawa, Y. Kawaguchi, and O. Sakai. Nature Lond. 367: 642-645, 1994). The deduced amino acid sequence of the encoded novel polypeptide lacked the signature sequence of a K(+)-selective pore region but predicted a topography suggestive of the inward rectifier K+ channel family. In subsequent articles a RACTK1 epitope was immunolocalized to the apical surface of kidney collecting duct and to arteriolar

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24

McPherson, D. C., H. Kim, M. Hahn, et al. "Characterization of the Bacillus subtilis Spore Morphogenetic Coat Protein CotO." Journal of Bacteriology 187, no. 24 (2005): 8278–90. http://dx.doi.org/10.1128/jb.187.24.8278-8290.2005.

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ABSTRACT Bacillus spores are protected by a structurally and biochemically complex protein shell composed of over 50 polypeptide species, called the coat. Coat assembly in Bacillus subtilis serves as a relatively tractable model for the study of the formation of more complex macromolecular structures and organelles. It is also a critical model for the discovery of strategies to decontaminate B. anthracis spores. In B. subtilis, a subset of coat proteins is known to have important roles in assembly. Here we show that the recently identified B. subtilis coat protein CotO (YjbX) has an especially

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25

Kaufman, S. J., R. F. Foster, K. R. Haye, and L. E. Faiman. "Expression of a developmentally regulated antigen on the surface of skeletal and cardiac muscle cells." Journal of Cell Biology 100, no. 6 (1985): 1977–87. http://dx.doi.org/10.1083/jcb.100.6.1977.

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H36 is a species-specific, cell-surface antigen on differentiating newborn rat skeletal myoblasts and myogenic lines. This membrane antigen has been defined by a monoclonal antibody raised by the fusion of SP 2/0-Ag14 myeloma cells with spleen cells from mice immunized with myotubes derived from the myogenic E63 line. H36 antigen, isolated by immunoaffinity chromatography, is comprised of two polypeptides with apparent molecular weights of 98,000 and 117,000. Fluorescence photometry and radioimmunoassays have been used to follow quantitative and topographic changes in the H36 determinant durin

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26

Ahrén, Bo, Maria Sörhede Winzell, Nils Wierup, Frank Sundler, Bryan Burkey та Thomas E. Hughes. "DPP-4 inhibition improves glucose tolerance and increases insulin and GLP-1 responses to gastric glucose in association with normalized islet topography in mice with β-cell-specific overexpression of human islet amyloid polypeptide". Regulatory Peptides 143, № 1-3 (2007): 97–103. http://dx.doi.org/10.1016/j.regpep.2007.03.008.

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Bayley, Hagan, Musti Krishnasastry, Barbara Walker та John Kasianowicz. "Assembly of α-Hemolysin: a Proteinaceous Pore with Potential Applications in Materials Synthesis". MRS Proceedings 292 (1992). http://dx.doi.org/10.1557/proc-292-243.

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Abstractα-Hemolysin (αHL) is secreted by the bacteriumStaphylococcus aureusas a watersoluble polypeptide of 293 amino acid residues. When presented with lipid bilayers or the detergent deoxycholate (DOC), aHL assembles into hexameric cylindrical pores that each contain one channel ∼ 1 to 2 nm in Internal diameter. A long-term goal of this laboratory is to use wild-type or re-engineered αHL pores as components of nanoscale materials: for example, to confer novel permeability properties upon thin films. The implementation of this concept would be facilitated by a better understanding of the mech

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Kotko, Oleksii, Petr Šálek, Jana Dvořáková, et al. "Soft micron-sized polypeptide microgels: preparation, crosslink density, topography and nanomechanics in swollen state." Materials Advances, 2024. http://dx.doi.org/10.1039/d4ma00356j.

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Aseyev, Vladimir. "Soft micron-sized polypeptide microgels: preparation, crosslink density, topography and nanomechanics in swollen state." June 25, 2024. https://doi.org/10.1039/d4ma00356j.

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Pedro, Lavrador, Gaspar Vítor, and Mano João. "Mechanochemical Patternable ECM-Mimetic Hydrogels for Programmed Cell Orientation." April 22, 2021. https://doi.org/10.5281/zenodo.6407048.

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Native human tissues are supported by a viscoelastic extracellular matrix (ECM) that can adapt its intricate network to dynamic mechanical stimuli. To recapitulate the unique ECM biofunctionality, hydrogel design is shifting from typical covalent crosslinks toward covalently adaptable networks. To pursue such properties, herein hybrid polysaccharide-polypeptide networks are designed based on dynamic covalent assembly inspired by natural ECM crosslinking processes. This is achieved through the synthesis of an amine-reactive oxidized-laminarin biopolymer that can readily crosslink with gelatin (

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sprotocols. "Biofunctionalization of PDMS-based microfluidic systems." January 18, 2015. https://doi.org/10.5281/zenodo.14013.

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Authors: Bergoi Ibarlucea, Cesar Fernández-Sánchez, Stefanie Demming, Stephanus Büttgenbach & Andreu Llobera ### Abstract Three simple approaches for the selective immobilization of biomolecules on the surface of poly(dimethylsiloxane) (PDMS) microfluidic systems that do not require any specific instrumentation, are described and compared. They are based in the introduction of hydroxyl groups on the PDMS surface by direct adsorption of either polyethylene glycol (PEG) or polyvinyl alcohol (PVA) as well as by a liquid-based oxidation step. The hydroxyl groups are then silanized using a sila

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