Abstract
An examination of the Arabidopsis thaliana genome sequence led to the identification of 29 predicted genes with the potential to encode members of the chaperonin family of chaperones (CPN60 and CCT), their associated cochaperonins, and the cytoplasmic chaperonin cofactor prefoldin. These comprise the first complete set of plant chaperonin protein sequences and indicate that the CPN family is more diverse than previously described. In addition to surprising sequence diversity within CPN subclasses, the genomic data also suggest the existence of previously undescribed family members, including a 10-kDa chloroplast cochaperonin. Consideration of the sequence data described in this review prompts questions about the complexities of plant CPN systems and the evolutionary relationships and functions of the component proteins, most of which have not been studied experimentally.
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