1. Multiple xylosyltransferases heterogeneously xylosylate protein N‐linked glycans in Chlamydomonas reinhardtii.
- Author
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Lucas, Pierre‐Louis, Mathieu‐Rivet, Elodie, Song, Philippe C.T., Oltmanns, Anne, Loutelier‐Bourhis, Corinne, Plasson, Carole, Afonso, Carlos, Hippler, Michael, Lerouge, Patrice, Mati‐Baouche, Narimane, and Bardor, Muriel
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CHLAMYDOMONAS reinhardtii , *CHLAMYDOMONAS , *GLYCANS , *MASS spectrometry , *GLYCOPROTEIN analysis , *ION mobility - Abstract
Summary : Nowadays, little information is available regarding the N‐glycosylation pathway in the green microalga Chlamydomonas reinhardtii. Recent investigation demonstrated that C. reinhardtii synthesizes linear oligomannosides. Maturation of these oligomannosides results in N‐glycans that are partially methylated and carry one or two xylose residues. One xylose residue was demonstrated to be a core β(1,2)‐xylose. Recently, N‐glycoproteomic analysis performed on glycoproteins secreted by C. reinhardtii demonstrated that the xylosyltransferase A (XTA) was responsible for the addition of the core β(1,2)‐xylose. Furthermore, another xylosyltransferase candidate named XTB was suggested to be involved in the xylosylation in C. reinhardtii. In the present study, we focus especially on the characterization of the structures of the xylosylated N‐glycans from C. reinhardtii taking advantage of insertional mutants of XTA and XTB, and of the XTA/XTB double‐mutant. The combination of mass spectrometry approaches allowed us to identify the major N‐glycan structures bearing one or two xylose residues. They confirm that XTA is responsible for the addition of the core β(1,2)‐xylose, whereas XTB is involved in the addition of the xylose residue onto the linear branch of the N‐glycan as well as in the partial addition of the core β(1,2)‐xylose suggesting that this transferase exhibits a low substrate specificity. Analysis of the double‐mutant suggests that an additional xylosyltransferase is involved in the xylosylation process in C. reinhardtii. Additional putative candidates have been identified in the C. reinhardtii genome. Altogether, these results pave the way for a better understanding of the C. reinhardtii N‐glycosylation pathway. Significance Statement: Xylosylation in Chlamydomonas reinhardtii leads to heterogeneous N‐glycan structures. XTA is responsible for the addition of core β(1,2)‐xylose, whereas XTB could be involved in the addition of xylose residue onto the linear branch of the N‐glycan and in complement to XTA, in the partial addition of the core β(1,2)‐xylose, suggesting that this transferase exhibits a low acceptor substrate specificity. Additional XT candidates are involved in the xylosylation process in C. reinhardtii. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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