当前位置： SCI文献检索 > ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS期刊下所有文献 > Molecular mechanisms of the resistance to hydrogen peroxide of enzymes involved in the calvin cycle from halotolerant Chlamydomonas sp. W80.

Molecular mechanisms of the resistance to hydrogen peroxide of enzymes involved in the calvin cycle from halotolerant Chlamydomonas sp. W80.

Abstract：

:cDNA clones encoding NADP(+)-glyceraldehyde-3-phosphate dehydrogenase (NADP(+)-GAPDH) and sedoheptulose-1,7-bisphosphatase (SBPase) were isolated and characterized from halotolerant Chlamydomonas sp. W80 (C. W80) cells. The cDNA clone for NADP(+)-GAPDH encoded 369 amino acid residues, preceded by the chloroplast transit peptide (37 amino acid residues). The cDNA clone for SBPase encoded 351 amino acids with the chloroplast transit peptide. The activities of NADP(+)-GAPDH and SBPase from C. W80 cells were resistant to H(2)O(2) up to 1 mM, as distinct from spinach chloroplastic thiol-modulated enzymes. The illumination to the dark-adapted cells and dithiothreitol treatment to the crude homogenate had little effect on the activities of NADP(+)-GAPDH and SBPase in C. W80. Modeling of the tertiary structures of NADP(+)-GAPDH and SBPase suggests that resistance of the enzymes to H(2)O(2) in C. W80 is due to the different conformational structures in the vicinity of the Cys residues of the chloroplastic enzymes between higher plant and C. W80 cells.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Tamoi M,Kanaboshi H,Miyasaka H,Shigeoka S

doi

10.1006/abbi.2001.2375

subject

Has Abstract

pub_date

2001-06-15 00:00:00

pages

176-85

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(01)92375-6

journal_volume

390

pub_type

杂志文章

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