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7mdh

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[[Image:7mdh.gif|left|200px]]
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{{STRUCTURE_7mdh| PDB=7mdh | SCENE= }}
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'''STRUCTURAL BASIS FOR LIGHT ACITVATION OF A CHLOROPLAST ENZYME. THE STRUCTURE OF SORGHUM NADP-MALATE DEHYDROGENASE IN ITS OXIDIZED FORM'''
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===STRUCTURAL BASIS FOR LIGHT ACITVATION OF A CHLOROPLAST ENZYME. THE STRUCTURE OF SORGHUM NADP-MALATE DEHYDROGENASE IN ITS OXIDIZED FORM===
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==Overview==
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Some key chloroplast enzymes are activated by light via a ferredoxin-thioredoxin reduction system which reduces disulfide bridges in the enzymes. We describe for the first time the structural basis for the redox activation of a chloroplast enzyme, the NADP-dependent malate dehydrogenase (MDH) from Sorghum vulgare whose structure has been determined and refined at 2.4 A resolution. In addition to the normal structural components of MDHs, the enzyme exhibits extensions at both the N- and C-termini, each of which contains a regulatory disulfide bridge which must be reduced for activation. The N-terminal disulfide motif is inserted in a cleft between the two subunits of the dimer, thereby locking the domains in each subunit. The C-terminal disulfide keeps the C-terminal residues tight to the enzyme surface and blocks access to the active site. Reduction of the N-terminal disulfide would release the stopper between the domains and give the enzyme the necessary flexibility. Simultaneous reduction of the C-terminal disulfide would free the C-terminal residues from binding to the enzyme and make the active site accessible.
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{{ABSTRACT_PUBMED_10194350}}
==About this Structure==
==About this Structure==
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[[Category: Saarinen, M.]]
[[Category: Saarinen, M.]]
[[Category: Activated by light]]
[[Category: Activated by light]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:46:38 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 14:42:02 2008''

Revision as of 11:42, 3 July 2008

Image:7mdh.png

Template:STRUCTURE 7mdh

STRUCTURAL BASIS FOR LIGHT ACITVATION OF A CHLOROPLAST ENZYME. THE STRUCTURE OF SORGHUM NADP-MALATE DEHYDROGENASE IN ITS OXIDIZED FORM

Template:ABSTRACT PUBMED 10194350

About this Structure

7MDH is a Single protein structure of sequence from Sorghum bicolor. Full crystallographic information is available from OCA.

Reference

Structural basis for light activation of a chloroplast enzyme: the structure of sorghum NADP-malate dehydrogenase in its oxidized form., Johansson K, Ramaswamy S, Saarinen M, Lemaire-Chamley M, Issakidis-Bourguet E, Miginiac-Maslow M, Eklund H, Biochemistry. 1999 Apr 6;38(14):4319-26. PMID:10194350

Page seeded by OCA on Thu Jul 3 14:42:02 2008

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