A xyloglucan endotransglucosylase/hydrolase involves in growth of primary root and alters the deposition of cellulose in Arabidopsis.
Xyloglucan endotransglucosylase/hydrolases (XTHs) are a class of enzymes that mediate the construction and restructure of the cellulose/xyloglucan framework by splitting and reconnecting xyloglucan molecule cross-linking among cellulose microfibrils. Remodification of cellulose microfibrils within cell-wall matrices is realized to be one of the most critical steps in the regulation of cells expansion in plants. Thirty-three XTH genes have been found in Arabidopsis thaliana but their roles remain unclear. AtXTH21 (At2g18800), an Arabidopsis XTH gene that mainly expresses in root and flower, exhibits different expression profiles from other XTH members under hormone treatment. We examined loss-of-function mutants using T-DNA insertion lines and overexpression lines and found that the AtXTH21 gene played a principal role in the growth of the primary roots by altering the deposition of cellulose and the elongation of cell wall.
Key Lab of MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China.
Ya-Bao
YB
Liu
Si-Min
SM
Lu
Jian-Feng
JF
Zhang
Sheng
S
Liu
Ying-Tang
YT
Lu
D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D015152:Blotting, Northern; D002473:Cell Wall / Q000378:metabolism / Q000648:ultrastructure; D002482:Cellulose / Q000378:metabolism*; D020869:Gene Expression Profiling; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005936:Glucans / Q000737:chemistry / Q000378:metabolism; D016695:Glycosyltransferases / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D046529:Microscopy, Electron, Transmission; D008970:Molecular Weight; D009154:Mutation; D010937:Plant Growth Regulators / Q000494:pharmacology; D018517:Plant Roots / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014990:Xylans / Q000737:chemistry / Q000378:metabolism
D029681:Arabidopsis Proteins; D005936:Glucans; D010937:Plant Growth Regulators; D014990:Xylans; C029353:xyloglucan; D002482:Cellulose; D016695:Glycosyltransferases; C000597590:XTH21 protein, Arabidopsis; C473049:xyloglucan - xyloglucosyltransferase