Plant Cell Wall Loosening by Expansins.
Annu Rev Cell Dev Biol
; 40(1): 329-352, 2024 Oct.
Article
in En
| MEDLINE
| ID: mdl-38724021
ABSTRACT
Expansins comprise an ancient group of cell wall proteins ubiquitous in land plants and their algal ancestors. During cell growth, they facilitate passive yielding of the wall's cellulose networks to turgor-generated tensile stresses, without evidence of enzymatic activity. Expansins are also implicated in fruit softening and other developmental processes and in adaptive responses to environmental stresses and pathogens. The major expansin families in plants include α-expansins (EXPAs), which act on cellulose-cellulose junctions, and ß-expansins, which can act on xylans. EXPAs mediate acid growth, which contributes to wall enlargement by auxin and other growth agents. The genomes of diverse microbes, including many plant pathogens, also encode expansins designated expansin-like X. Expansins are proposed to disrupt noncovalent bonding between laterally aligned polysaccharides (notably cellulose), facilitating wall loosening for a variety of biological roles.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Plant Proteins
/
Cell Wall
Language:
En
Journal:
Ann. rev. cell dev. biol
/
Annu Rev Cell Dev Biol
/
Annual review of cell and developmental biology
Journal subject:
BIOLOGIA
Year:
2024
Type:
Article