Proteolytic release of cell surface proteins during differentiation of Trypanosoma brucei

Biochemistry ◽  
1993 ◽  
Vol 32 (14) ◽  
pp. 3737-3742 ◽  
Author(s):  
Karl Ziegelbauer ◽  
Bernd Stahl ◽  
Michael Karas ◽  
York Dieter Stierhof ◽  
Peter Overath
Keyword(s):  
Cell Surface ◽  
Trypanosoma Brucei ◽  
Surface Proteins ◽  
Cell Surface Proteins

What do nanometer molecular trajectories tell us about heterogeneous cell surface domaines?

1995 ◽  
Vol 53 ◽  
pp. 786-787
Author(s):  
Watt W. Webb
Keyword(s):  
Cell Surface ◽  
Lipid Membranes ◽  
Surface Proteins ◽  
Protein Diffusion ◽  
Coated Pits ◽  
Cell Surface Proteins ◽  
Membrane Heterogeneity ◽  
Fluorescence Photobleaching Recovery ◽  
Photobleaching Recovery ◽  
Plasma Membrane Heterogeneity

Plasma membrane heterogeneity is implicit in the existence of specialized cell surface organelles which are necessary for cellular function; coated pits, post and pre-synaptic terminals, microvillae, caveolae, tight junctions, focal contacts and endothelial polarization are examples. The persistence of these discrete molecular aggregates depends on localized restraint of the constituent molecules within specific domaines in the cell surface by strong intermolecular bonds and/or anchorage to extended cytoskeleton. The observed plasticity of many of organelles and the dynamical modulation of domaines induced by cellular signaling evidence evanescent intermolecular interactions even in conspicuous aggregates. There is also strong evidence that universal restraints on the mobility of cell surface proteins persist virtually everywhere in cell surfaces, not only in the discrete organelles. Diffusion of cell surface proteins is slowed by several orders of magnitude relative to corresponding protein diffusion coefficients in isolated lipid membranes as has been determined by various ensemble average methods of measurement such as fluorescence photobleaching recovery(FPR).

scholarly journals Cell Surface Expression of Nrg1 Protein in Candida auris

2021 ◽  
Vol 7 (4) ◽  
pp. 262
Author(s):  
Anuja Paudyal ◽  
Govindsamy Vediyappan
Keyword(s):  
Cell Surface ◽  
Growth Conditions ◽  
Zinc Ion ◽  
Surface Proteins ◽  
Cell Surface Expression ◽  
Unexpected Finding ◽  
Candida Auris ◽  
Cell Surface Proteins ◽  
Biofilm Growth

Candida auris is an emerging antifungal resistant human fungal pathogen increasingly reported in healthcare facilities. It persists in hospital environments, and on skin surfaces, and can form biofilms readily. Here, we investigated the cell surface proteins from C. auris biofilms grown in a synthetic sweat medium mimicking human skin conditions. Cell surface proteins from both biofilm and planktonic control cells were extracted with a buffer containing β-mercaptoethanol and resolved by 2-D gel electrophoresis. Some of the differentially expressed proteins were excised and identified by mass spectrometry. C. albicans orthologs Spe3p, Tdh3p, Sod2p, Ywp1p, and Mdh1p were overexpressed in biofilm cells when compared to the planktonic cells of C. auris. Interestingly, several proteins with zinc ion binding activity were detected. Nrg1p is a zinc-binding transcription factor that negatively regulates hyphal growth in C. albicans. C. auris does not produce true hypha under standard in vitro growth conditions, and the role of Nrg1p in C. auris is currently unknown. Western blot analyses of cell surface and cytosolic proteins of C. auris against anti-CalNrg1 antibody revealed the Nrg1p in both locations. Cell surface localization of Nrg1p in C. auris, an unexpected finding, was further confirmed by immunofluorescence microscopy. Nrg1p expression is uniform across all four clades of C. auris and is dependent on growth conditions. Taken together, the data indicate that C. auris produces several unique proteins during its biofilm growth, which may assist in the skin-colonizing lifestyle of the fungus during its pathogenesis.

scholarly journals Understudied G Protein-Coupled Receptors in the Kidney

Nephron ◽  
2021 ◽  
pp. 1-4
Author(s):  
Nathan A. Zaidman ◽  
Jennifer L. Pluznick
Keyword(s):  
Renal Function ◽  
Cell Surface ◽  
Gene Family ◽  
G Protein ◽  
External Environment ◽  
G Protein Coupled Receptors ◽  
Surface Proteins ◽  
Cell Surface Proteins ◽  
Large Subset ◽  
G Protein Coupled

G protein-coupled receptors (GPCRs) are cell surface proteins which play a key role in allowing cells, tissues, and organs to respond to changes in the external environment in order to maintain homeostasis. Despite the fact that GPCRs are known to play key roles in a variety of tissues, there are a large subset of GPCRs that remain poorly studied. In this minireview, we will summarize what is known regarding the “understudied” GPCRs with respect to renal function, and in so doing will highlight the promise represented by studying this gene family.

Functions of red cell surface proteins

Vox Sanguinis ◽  
2007 ◽  
Vol 0 (0) ◽  
pp. 070807042627006-??? ◽  
Author(s):  
G. Daniels
Keyword(s):  
Cell Surface ◽  
Surface Proteins ◽  
Red Cell ◽  
Cell Surface Proteins
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