| Autor: |
Silvia Melina Velasquez, Juan eSalgado Salter, Bent Larsen ePetersen, Jose Manuel Estevez |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
|
| Zdroj: |
Frontiers in Plant Science, Vol 3 (2012) |
| Druh dokumentu: |
article |
| ISSN: |
1664-462X |
| DOI: |
10.3389/fpls.2012.00093 |
| Popis: |
The genetic set up and the enzymes that define the O-glycosylation sites and transfer the activated sugars to the cell wall protein backbone have remained unknown for a long time. We are now beginning to see the emerging components of the molecular machinery that assembles these complex O-glycoproteins on the plant cell wall. Genes conferring the posttranslational modifications, i.e. proline hydroxylation and subsequent O-glycosylation, of the plant cell wall protein extensin subgroup have being recently identified. In this review we summarize the enzymes that define the O-glycosylation sites on the O-glycoproteins, i.e. the prolyl 4–hydroxylases (P4Hs), the glycosyltransferases that transfer arabinose units (named arabinosyltransferases, AraTs) and the one responsible for the transfer of a single galactose (galactosyltransferase, GalT) on the protein extensin backbones, and finally the EXT peroxidase-mediated crosslinking at the cell wall. We discuss the effect of posttranslational modification on the structure and function of extensins in the plant cell walls. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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