Xyloglucan endo-transglycosylase explained

Symbol:	XET_C
Xyloglucan endo-transglycosylase C terminal domain
Pfam:	PF06955
Interpro:	IPR010713
Scop:	1un1

In molecular biology, the xyloglucan endo-transglycosylase (XET) is an enzyme that is involved in the metabolism of xyloglucan, which is a component of plant cell walls. This enzyme is part of glycoside hydrolase family 16.

Function

Xyloglucan endo-transglycosylase (XET) is thought to be highly important during seed germination, fruit ripening, and rapid wall expansion.^[1]

Xyloglucan is the predominant hemicellulose in the primary cell walls of most dicotyledons. With cellulose, it forms a network that strengthens the cell wall. XET catalyses the splitting of xyloglucan chains and the linking of the newly generated reducing end to the non-reducing end of another xyloglucan chain, thereby loosening the cell wall.^[2]

Notes and References

1. Baumann MJ, Eklöf JM, Michel G, Kallas AM, Teeri TT, Czjzek M, etal . Structural evidence for the evolution of xyloglucanase activity from xyloglucan endo-transglycosylases: biological implications for cell wall metabolism. . Plant Cell . 2007 . 19 . 6 . 1947–63 . 17557806 . 10.1105/tpc.107.051391 . 1955714 .
2. Schröder R, Atkinson RG, Langenkämper G, Redgwell RJ . Biochemical and molecular characterisation of xyloglucan endotransglycosylase from ripe kiwifruit . Planta . 204 . 2 . 242–51 . February 1998 . 9487728 . 10.1007/s004250050253. 1998Plant.204..242S . 24098211 .