Sequence homology between the 32K dalton and the D2 chloroplast membrane polypeptides of Chlamydomonas reinhardii.

Plant molecular biology ·Vol. 3 ·No. 6 ·1984-11-00 ·Pages 363-70

Rochaix JD, Dron M, Rahire M, Malnoe P

Abstract

The region of the chloroplast genome of Chlamydomonas reinhardii containing the gene of the thylakoid polypeptide D2 (psbD) has been sequenced. A unique open reading frame of 350 codons exists in this region. Because the first ATG is followed 11 codons downstream by a second one, the D2 polypeptide consists of either 339 or 350 amino acids. Comparison of the sequences of D2 and the 32K dalton polypeptides, both of which are associated with photosystem II, reveals partial homology. Although, the overall homology of these two polypeptides is only 27%, they contain several related regions and their hydropathic profiles are strikingly similar. These data suggest that the two polypeptides may have related functions and/or that their genes may have originated from a common ancestor. Alternatively, convergent evolution of these polypeptides may be due to structural constraints in the thylakoid membrane. Limited sequence homology is also observed between the D2 polypeptide and some of the subunits of the reaction centers of photosynthetic bacteria.

Authors & Affiliations

4 authors, click to expand affiliations / ORCID

Rochaix J D

Department of Molecular Biology, University of Geneva, 1211, Geneva 4, Switzerland.

Dron M

Rahire M

Malnoe P

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Article Info

Journal

Plant molecular biology

Abbr.

Plant Mol Biol

ISSN

0167-4412

DOI

10.1007/BF00033383

Published

1984-11-00

Pages

363-70

Language

English

Region

Netherlands

NLM ID

9106343

External Links

PubMed source DOI: 10.1007/BF00033383 View journal details

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Sequence homology between the 32K dalton and the D2 chloroplast membrane polypeptides of Chlamydomonas reinhardii.

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