Send to:

Choose Destination
See comment in PubMed Commons below
Gene. 1990 Oct 15;94(2):181-7.

Unique composition of plastid chaperonin-60: alpha and beta polypeptide-encoding genes are highly divergent.

Author information

  • 1Plant Biotechnology Institute, National Research Council Canada, Saskatoon, Saskatchewan.


Molecular chaperones of the chaperonin family occur in prokaryotes and in plastids and mitochondria. Prokaryotic and mitochondrial chaperonin-60 oligomers (Cpn-60) are composed of a single subunit type (p60cpn-60). In contrast, preparations of purified plastid Cpn-60 contain approximately equal quantities of two polypeptides, p60cpn-60 alpha and p60cpn-60 beta, with slightly different electrophoretic mobilities. We have isolated cDNA clones encoding plastid p60cpn-60 alpha and p60cpn-60 beta polypeptides from Brassica napus and Arabidopsis thaliana. The unexpected degree of sequence divergence observed between p60cpn-60 alpha and p60cpn-60 beta raises questions concerning the structure of the oligomer and the functions of these polypeptides. We have also found an amino acid sequence motif within all p60cpn-60 sequences which resembles the p10cpn-10 sequences.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Loading ...
    Write to the Help Desk