Arabidopsis TCH4, regulated by hormones and the environment, encodes a xyloglucan endotransglycosylase.
AUTOR(ES)
Xu, W
RESUMO
Adaptation of plants to environmental conditions requires that sensing of external stimuli be linked to mechanisms of morphogenesis. The Arabidopsis TCH (for touch) genes are rapidly upregulated in expression in response to environmental stimuli, but a connection between this molecular response and developmental alterations has not been established. We identified TCH4 as a xyloglucan endotransglycosylase by sequence similarity and enzyme activity. Xyloglucan endotransglycosylases most likely modify cell walls, a fundamental determinant of plant form. We determined that TCH4 expression is regulated by auxin and brassinosteroids, by environmental stimuli, and during development, by a 1-kb region. Expression was restricted to expanding tissues and organs that undergo cell wall modification. Regulation of genes encoding cell wall-modifying enzymes, such as TCH4, may underlie plant morphogenetic responses to the environment.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=161010Documentos Relacionados
- The Arabidopsis TCH4 xyloglucan endotransglycosylase. Substrate specificity, pH optimum, and cold tolerance.
- Complete cDNA and genomic sequence encoding a flooding-responsive gene from maize (Zea mays L.) homologous to xyloglucan endotransglycosylase.
- Characterization of a Tomato Xyloglucan Endotransglycosylase Gene That Is Down-Regulated by Auxin in Etiolated Hypocotyls1
- Cellular localization of Arabidopsis xyloglucan endotransglycosylase-related proteins during development and after wind stimulation.
- Inside the Matrix: Crystal Structure of a Xyloglucan Endotransglycosylase