2hlp | pdb_00002hlp

CRYSTAL STRUCTURE OF THE E267R MUTANT OF A HALOPHILIC MALATE DEHYDROGENASE IN THE APO FORM

spinqualitylabelsall models 2hlp, resolution 2.59Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2hlp is a 2 chain structure with sequence from "flavobacterium_(halobacterium)_maris-mortui_(sic)"_elazari-volcani_1940 "flavobacterium (halobacterium) maris-mortui (sic)" elazari-volcani 1940. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, NA Activity: Malate dehydrogenase, with EC number 1.1.1.37 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [MDH_HALMA] Catalyzes the reversible oxidation of malate to oxaloacetate.[HAMAP-Rule:MF_00487] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Previous biophysical studies of tetrameric malate dehydrogenase from the halophilic archaeon Haloarcula marismortui (Hm MalDH) have revealed the importance of protein-solvent interactions for its adaptation to molar salt conditions that strongly affect protein solubility, stability, and activity, in general. The structures of the E267R stability mutant of apo (-NADH) Hm MalDH determined to 2.6 A resolution and of apo (-NADH) wild type Hm MalDH determined to 2.9 A resolution, presented here, highlight a variety of novel protein-solvent features involved in halophilic adaptation. The tetramer appears to be stabilized by ordered water molecule networks and intersubunit complex salt bridges "locked" in by bound solvent chloride and sodium ions. The E267R mutation points into a central ordered water cavity, disrupting protein-solvent interactions. The analysis of the crystal structures showed that halophilic adaptation is not aimed uniquely at "protecting" the enzyme from the extreme salt conditions, as may have been expected, but, on the contrary, consists of mechanisms that harness the high ionic concentration in the environment. Halophilic adaptation: novel solvent protein interactions observed in the 2.9 and 2.6 A resolution structures of the wild type and a mutant of malate dehydrogenase from Haloarcula marismortui.,Richard SB, Madern D, Garcin E, Zaccai G Biochemistry. 2000 Feb 8;39(5):992-1000. PMID:10653643 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Malate dehydrogenase

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