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FEBS Lett. 2001 Jan 5;487(3):347-50.

The 70-kDa major DNA-compacting protein of the chloroplast nucleoid is sulfite reductase.

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  • 1Department of Molecular Biology, Saitama University, Urawa, Saitama Prefecture, Japan.


The chloroplast nucleoid is a complex of chloroplast DNA and various, mostly uncharacterized proteins. An abundant 70-kDa protein of the isolated nucleoids of pea chloroplasts was identified as sulfite reductase by N-terminal sequence analysis as well as immunoblot analysis, spectrophotometry and enzyme activity analysis. Recombinant maize sulfite reductase was indeed able to compact chloroplast DNA and to form nucleoid-like particles in vitro. The role of sulfite reductase in the structural organization of the nucleoid is discussed.

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