PMID: 7580854Jan 1, 1995Paper

Nucleoside diphosphate kinase from pea chloroplasts: purification, cDNA cloning and import into chloroplasts

Planta
J Lübeck, J Soll

Abstract

Nucleoside diphosphate kinase (NDPK; EC 2.7.4.6) was enriched 1900-fold from purified pea (Pisum sativum L. cv. Golf.) chloroplasts. The active enzyme preparation contained two polypeptides of apparent molecular weight 18.5 kDa and 17.4 kDa. Both proteins were enzymatically active and were recognized by an antiserum raised against NDPK from spinach chloroplasts, suggesting the existence of two isoforms in pea chloroplasts. The N-terminal protein sequence data were obtained for both polypeptides and compared with the nucleotide sequence of a cDNA clone isolated from a pea cDNA library. The analysis revealed that the two NDPK forms are encoded for by one mRNA, indicating that the lower-molecular-weight form could represent a proteolytic breakdown product of the 18.5-kDa NDPK. The pea chloroplastic NDPK is made as a larger precursor protein which is imported into chloroplasts. The NDPK precursor is then processed by the stromal processing peptidase to yield the 18.5-kDa form.

Citations

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