Multiple xylosyltransferases heterogeneously xylosylate protein N-linked glycans in Chlamydomonas reinhardtii - Normandie Université Accéder directement au contenu
Article Dans Une Revue Plant Journal Année : 2020

Multiple xylosyltransferases heterogeneously xylosylate protein N-linked glycans in Chlamydomonas reinhardtii

Résumé

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.

Dates et versions

hal-02465693 , version 1 (04-02-2020)

Identifiants

Citer

Pierre-Louis Lucas, Elodie Mathieu-Rivet, Philippe C T Song, Anne Oltmanns, Corinne Loutelier-Bourhis, et al.. Multiple xylosyltransferases heterogeneously xylosylate protein N-linked glycans in Chlamydomonas reinhardtii. Plant Journal, 2020, 102 (2), pp.230-245. ⟨10.1111/tpj.14620⟩. ⟨hal-02465693⟩
92 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More