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. 1992 Oct;100(2):1048–1054. doi: 10.1104/pp.100.2.1048

Isolation and Characterization of a cDNA Clone Encoding the Major Hsp70 of the Pea Chloroplastic Stroma 1

Jerry S Marshall 1,2, Kenneth Keegstra 1
PMCID: PMC1075665  PMID: 16653016

Abstract

The 70-kD heat shock proteins (hsp70s) are a group of ubiquitous, highly conserved molecular chaperones that have been implicated in a variety of processes, ranging from DNA replication to protein folding and transport. To learn more about the evolution and possible functions of higher plant chloroplastic hsp70s, we isolated a cDNA clone encoding the major stromal hsp70 of pea chloroplasts, which we term CSS1 (Chloroplastic Stress Seventy). This cDNA clone encodes a 75,490-D protein that is very closely related to an hsp70 from the cyanobacterium, Synechocystis. CSS1 is nuclear encoded and synthesized as a higher molecular mass precursor with a chloroplastic transit peptide approximately 65 amino acids long. CSS1 mRNA was detected in RNA samples from leaves and roots of pea (Pisum sativum) plants grown at 18°C but increased 9- and 6-fold, respectively, after brief exposure of the plants to elevated temperature. We discuss the possible role(s) of CSS1 in chloroplastic protein transport and other processes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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