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Published on October 3, 2002; 10.1104/pp.007468

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Received April 23, 2002
Returned for revision June 5, 2002
Accepted June 18, 2002

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

François Roudier , Gary Schindelman , 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.)

* Corresponding author; email: philip.benfey{at}duke.edu.

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.




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