Polypeptide composition of cell wall extracts and whole protoplast homogenates from C. albicans as revealed by different electrophoretic techniques (A.

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Polypeptide composition of cell wall extracts and whole protoplast homogenates from C. albicans as revealed by different electrophoretic techniques (A and B). Polypeptide composition of cell wall extracts and whole protoplast homogenates from C. albicans as revealed by different electrophoretic techniques (A and B). C. albicanscells from which samples were obtained were incubated in the presence of 14C-labelled protein hydrolysate and subsequently tagged with biotin. Double-labelled cell wall proteins and glycoproteins were extracted from intact blastoconidia (lanes 1 and 3) and germinated blastoconidia (lanes 2 and 4) by sequential treatment with βME (lanes 1 and 2) and digestion with Zymolyase 20T (lanes 3 and 4). Samples of protoplast homogenates from blastoconidia and germinated blastoconidia were run in lanes 5 and 6, respectively. Polypeptides were separated by SDS-PAGE and detected by fluorography (A) or transferred to nitrocellulose and detected with an avidin-peroxidase conjugate (B; lane S in this panel shows a mixture of prestained molecular weight standards run in parallel). Numbers and letters are used to identify and compare bands detected in the cell wall extracts by the different experimental procedures used. Although qualitative differences were observed (i.e., some polypeptides exhibited a strong radioactive label but were weakly biotinylated [band 6; star]), surface labelling of cells with biotin appeared to be a suitable technique to detect proteins in the wall of C. albicans. Thus, from the complex polypeptide pattern found in the protoplast homogenate samples as revealed by fluorography (A, lanes 5 and 6), only few species were labelled with biotin, indicating that most proteins released by βME and Zymolyase from intact cells are bona fide cell wall components. Brackets indicate a cluster of bands within a molecular weight range where many candidal moieties that represent receptors for host ligands have been identified (see the text). Reprinted from reference61 with permission of the American Society for Microbiology. (C) The complexity of the polypeptide pattern of the cell wall extracts was clearly evidenced when analysis was performed by two-dimensional PAGE and silver staining (the polypeptide pattern shown corresponds to the βME extract from blastoconidia). Reprinted from reference 486 with permission of the American Society for Microbiology. W. Lajean Chaffin et al. Microbiol. Mol. Biol. Rev. 1998; doi: