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7mdh
From Proteopedia
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|PDB= 7mdh |SIZE=350|CAPTION= <scene name='initialview01'>7mdh</scene>, resolution 2.40Å | |PDB= 7mdh |SIZE=350|CAPTION= <scene name='initialview01'>7mdh</scene>, resolution 2.40Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=ZN:ZINC ION'>ZN</scene> | + | |LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Malate_dehydrogenase_(NADP(+)) Malate dehydrogenase (NADP(+))], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.82 1.1.1.82] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Malate_dehydrogenase_(NADP(+)) Malate dehydrogenase (NADP(+))], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.82 1.1.1.82] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=7mdh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7mdh OCA], [http://www.ebi.ac.uk/pdbsum/7mdh PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=7mdh RCSB]</span> | ||
}} | }} | ||
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[[Category: Ramaswamy, S.]] | [[Category: Ramaswamy, S.]] | ||
[[Category: Saarinen, M.]] | [[Category: Saarinen, M.]] | ||
| - | [[Category: ZN]] | ||
[[Category: activated by light]] | [[Category: activated by light]] | ||
[[Category: chloroplastic malate dehydrogenase (nadp+)]] | [[Category: chloroplastic malate dehydrogenase (nadp+)]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 05:44:32 2008'' |
Revision as of 02:44, 31 March 2008
| |||||||
| , resolution 2.40Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Activity: | Malate dehydrogenase (NADP(+)), with EC number 1.1.1.82 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STRUCTURAL BASIS FOR LIGHT ACITVATION OF A CHLOROPLAST ENZYME. THE STRUCTURE OF SORGHUM NADP-MALATE DEHYDROGENASE IN ITS OXIDIZED FORM
Overview
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.
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 Mon Mar 31 05:44:32 2008
