PMID: 8980547Dec 1, 1996Paper

CP12: a small nuclear-encoded chloroplast protein provides novel insights into higher-plant GAPDH evolution

Plant Molecular Biology
K PohlmeyerNorbert Wedel

Abstract

Higher-plant chloroplast NAD(P)-glyceraldehyde 3-phosphate dehydrogenase (NAD(P)-GAPDH; EC 1.2.1.13) is composed of two different nuclear-encoded subunits, GAPA and GAPB, forming the highly active heterotetrameric A2B2 enzyme. The main difference between these two subunits is a C-terminal extension of about 30 amino acid residues of GAPB. We present cDNA clones for a nuclear-encoded chloroplast protein from pea, spinach and tobacco, which we have named CP12. The mature protein consists of only 74, 75 and 76 amino acid residues, respectively and contains two domains with significant homology to the C-terminal extension of GAPB. Affinity chromatography approaches reveal also a specific interaction between CP12 and chloroplast GAPDH. Northern blot analysis indicates that CP12 is, like plastid GAPDH, expressed in green and also in etiolated leaves. Further homology is observed between CP12 and ORF3, an open reading frame located in the hox gene cluster of Anabaena variabilis. This gene cluster encodes the subunits of the bidirectional NADP(+)-dependent [NiFeS] dehydrogenase. We propose therefore a common evolutionary origin of CP12 and higher-plant chloroplast GAPDH subunit GAPB from the cyanobacterial ORF3.

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Citations

Apr 14, 2007·Current Genetics·Stéphane D LemaireEmmanuelle Issakidis-Bourguet
Nov 9, 2002·European Journal of Biochemistry·Renate ScheibeSonja-Manuela Sauermann
Mar 7, 2008·Proceedings of the National Academy of Sciences of the United States of America·Thomas P HowardChristine A Raines
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