NDLI: The proteolytic function of the Arabidopsis 26S proteasome is required for specifying leaf adaxial identity.

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The proteolytic function of the Arabidopsis 26S proteasome is required for specifying leaf adaxial identity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Huang, Weihua Pi, Limin Liang, Wanqi Xu, Ben Wang, Hua Cai, Run Huang, Hai
Description	Country affiliation: China Author Affiliation: Huang W ( National Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institute for Biological Sciences, Shanghai 200032, China. hhuang@sippe.ac.cn)
Abstract	Polarity formation is central to leaf morphogenesis, and several key genes that function in adaxial-abaxial polarity establishment have been identified and characterized extensively. We previously reported that Arabidopsis thaliana ASYMMERTIC LEAVES1 (AS1) and AS2 are important in promoting leaf adaxial fates. We obtained an as2 enhancer mutant, asymmetric leaves enhancer3 (ae3), which demonstrated pleiotropic plant phenotypes, including a defective adaxial identity in some leaves. The ae3 as2 double mutant displayed severely abaxialized leaves, which were accompanied by elevated levels of leaf abaxial promoting genes FILAMENTOUS FLOWER, YABBY3, KANADI1 (KAN1), and KAN2 and a reduced level of the adaxial promoting gene REVOLUTA. We identified AE3, which encodes a putative 26S proteasome subunit RPN8a. Furthermore, double mutant combinations of as2 with other 26S subunit mutations, including rpt2a, rpt4a, rpt5a, rpn1a, rpn9a, pad1, and pbe1, all displayed comparable phenotypes with those of ae3 as2, albeit with varying phenotypic severity. Since these mutated genes encode subunits that are located in different parts of the 26S proteasome, it is possible that the proteolytic function of the 26S holoenzyme is involved in leaf polarity formation. Together, our findings reveal that posttranslational regulation is essential in proper leaf patterning.
File Format	HTM / HTML
ISSN	10404651
e-ISSN	1531298X
Journal	THE PLANT CELL ONLINE
Issue Number	10
Volume Number	18
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2006-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Botany Arabidopsis Enzymology Growth & Development Proteasome Endopeptidase Complex Metabolism Amino Acid Sequence Genetics Cloning, Molecular Dna Primers Gene Expression Regulation, Plant Genes, Plant Hydrolysis Molecular Sequence Data Mutation Phenotype Chemistry Reverse Transcriptase Polymerase Chain Reaction Sequence Homology, Amino Acid Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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