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First published online October 3, 2002; 10.1104/pp.007468

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Plant Physiol, October 2002, Vol. 130, pp. 538-548

The COBRA Family of Putative GPI-Anchored Proteins in Arabidopsis. A New Fellowship in Expansion1

François Roudier, Gary Schindelman,2 Rob DeSalle, and Philip N. Benfey*

Department of Biology, New York University, New York, New York 10003 (F.R., G.S., P.N.B.); and Division of Invertebrates, American Museum of Natural History, New York, New York (R.D.)

Identification of regulatory molecules that determine the extent and direction of expansion is necessary to understand how cell morphogenesis is controlled in plants. We recently identified COB (COBRA) as a key regulator of the orientation of cell expansion in the root. Analysis of the Arabidopsis genome sequence indicated that COB belongs to a multigene family consisting of 12 members, all predicted to encode glycosylphosphatidylinositol-anchored proteins. All but two of the COBL (COB-like) genes are expressed in most organs examined, suggesting possible redundancy. Sequence comparisons, phylogenetic analyses, and exon-intron positions revealed that the COB family is composed of two main subgroups sharing a common architecture, one subgroup being characterized by an additional N-terminal domain. Identification of expressed sequence tags corresponding to potential orthologs in other plant species suggested that COB-related functions are required in all vascular plants. Together, these results indicate that COB family members are likely to be important new players at the plasma membrane-cell wall interface.

1 This work was supported by the National Science Foundation (grants to P.N.B.), by the Graduate School of Arts and Sciences at New York University (Dean's Dissertation Fellowship to G.S.), and in part by the Lewis B. and Dorothy Cullman Program for Molecular Systematic Studies and the Ambrose Monell Collection for Molecular and Microbial Research (to R.D.).

2 Present address: Division of Biology and Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125.

* Corresponding author; e-mail philip.benfey{at}duke.edu; fax 919-613-8177.

© 2002 American Society of Plant Physiologists


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