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Beta-1,2 oligomannose adhesin epitopes are widely distributed over the different families of Candida albicans cell wall mannoproteins and are associated through both N- and O-glycosylation processes.

Abstract：

:Beta-1,2-linked mannosides (beta-Mans) are believed to contribute to Candida albicans virulence. The presence of beta-Mans has been chemically established for two molecules (phosphopeptidomannan [PPM] and phospholipomannan) that are noncovalently linked to the cell wall, where they correspond to specific epitopes. However, a large number of cell wall mannoproteins (CWMPs) also express beta-Man epitopes, although their nature and mode of beta-mannosylation are unknown. We therefore used Western blotting to map beta-Man epitopes for the different families of mannoproteins gradually released from the cell wall according to their mode of anchorage (soluble, released by dithiothreitol, beta-1,3 glucan linked, and beta-1,6 glucan linked). Reduction of beta-Man epitope expression occurred after chemical and enzymatic deglycosylation of the different cell wall fractions, as well as in a secreted form of Hwp1, a representative of the CWMPs linked by glycosylphosphatidylinositol remnants. Enzyme-linked immunosorbent assay inhibition tests were performed to assess the presence of beta-Man epitopes in released oligomannosides. A comparison of the results obtained with CWMPs to the results obtained with PPM and the use of mutants with mutations affecting O and N glycosylation demonstrated that both O glycosylation and N glycosylation participate in the association of beta-Mans with the protein moieties of CWMPs. This process, which can alter the function of cell wall molecules and their recognition by the host, is therefore more important and more complex than originally thought, since it differs from the model established previously with PPM.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Fradin C,Slomianny MC,Mille C,Masset A,Robert R,Sendid B,Ernst JF,Michalski JC,Poulain D

doi

10.1128/IAI.00368-08

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

4509-17

issue

eissn

0019-9567

issn

1098-5522

pii

IAI.00368-08

journal_volume

pub_type

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Beta-1,2 oligomannose adhesin epitopes are widely distributed over the different families of Candida albicans cell wall mannoproteins and are associated through both N- and O-glycosylation processes.