Expanisns |
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Authors: | Mark W Shieh Daniel J Cosgrove |
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Institution: | (1) Department of Biology, 208 Mueller Laboratory, Pennsylvania State University, 16802 University Park, PA, USA |
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Abstract: | Biochemical dissection of the “acid-growth” process of plant cell walls led to the isolation of a new class of wall loosening
proteins, called expansins. These proteins affect the rheology of growing walls by permitting the microfibril-matrix network
to slide, thereby enabling the wall to expand. Molecular sequence analysis suggests that expansins might have a cryptic glycosyl
transferase activity, but biochemical results suggest that expansins disrupt noncovalent bonding between microfibrils and
the matrix. Recent discoveries of a new expansin family and gene expression in fruit, meristerms and cotton fibers have enlarged
our view of the developmental functions of this group of wall loosening proteins. |
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Keywords: | Cell enlargement Cell growth Cell wall loosening Cell walls Expansin |
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