[No authors listed]
Patatin-containing phospholipase A (pPLA) hydrolyzes membrane glycerolipids, producing free fatty acids and lysoglycerolipids. Ten pPLAs in the Arabidopsis thaliana genome are grouped into 3 subfamilies, and pPLAIIIs differ from pPLAI and IIs in their catalytic motifs and overexpression (OE) of pPLAIIIs reduces cell elongation and cellulose content. To probe the question of how pPLAIII overexpression results in the changes, comparative proteomic analyses were conducted between pPLAIIIδ-OE and WT seedlings. The data indicate a change in the microtubule-associated protein, MAP18. MAP18 is involved in destabilizing cortical microtubules and modulating directional cell growth. The result suggests that pPLAIII and their derived products may regulate cytoskeletal dynamics leading to retardation in anisotropic growth.
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