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Towards an experimental system for the examination of protein mannosylation in Actinobacteria.
Glycobiology 2023 March 22
The actinobacterial species Cellulomonas fimi ATCC484 has long been known to secrete mannose-containing proteins, but a closer examination of glycoproteins associated with the cell has never been reported. Using ConA lectin chromatography and mass spectrometry we have surveyed the cell associated glycoproteome from C. fimi and collected detailed information on the glycosylation sites of 19 cell-associated glycoproteins. In addition, we have expressed a previously known C. fimi secreted cellulase, Celf_3184, (formerly CenA), a putative peptide prolyl-isomerase, Celf_2022, and a penicillin binding protein, Celf_0189, in the mannosylation capable host, Corynebacterium glutamicum. We found that the glycosylation machinery in C. glutamicum was able to use the recombinant C. fimi proteins as substrates and that the glycosylation matched closely that found in the native proteins when expressed in C. fimi. We are pursuing this observation as a prelude to dissecting the biosynthetic machinery and biological consequences of this protein mannosylation.
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