NDLI: Genes for calcineurin B-like proteins in Arabidopsis are differentially regulated by stress signals

Content Provider	PubMed Central
Author	Kudla, Jörg Xu, Qiang Harter, Klaus Wilhelm, Gruissem Luan, Sheng
Copyright Year	1999
Abstract	An important effector of Ca2+ signaling in animals and yeast is the Ca2+/calmodulin-dependent protein phosphatase calcineurin. However, the biochemical identity of plant calcineurin remained elusive. Here we report the molecular characterization of AtCBL ( A rabidopsis t haliana calcineurin B-like protein) from Arabidopsis. The protein is most similar to mammalian calcineurin B, the regulatory subunit of the phosphatase. AtCBL also shows significant similarity with another Ca2+-binding protein, the neuronal calcium sensor in animals. It contains typical EF-hand motifs with Ca2+-binding capability, as confirmed by in vitro Ca2+-binding assays, and it interacts in vivo with rat calcineurin A in the yeast two-hybrid system. Interaction of AtCBL1 and rat calcineurin A complemented the salt-sensitive phenotype in a yeast calcineurin B mutant. Cloning of cDNAs revealed that AtCBL proteins are encoded by a family of at least six genes in Arabidopsis. Genes for three isoforms were identified in this study. AtCBL1 mRNA was preferentially expressed in stems and roots and its mRNA levels strongly increased in response to specific stress signals such as drought, cold, and wounding. In contrast, AtCBL2 and AtCBL3 are constitutively expressed under all conditions investigated. Our data suggest that AtCBL1 may act as a regulatory subunit of a plant calcineurin-like activity mediating calcium signaling under certain stress conditions.
Starting Page	4718
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	8
Volume Number	96
Language	English
Publisher	The National Academy of Sciences
Publisher Date	1999-04-13
Access Restriction	Open
Rights Holder	The National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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