4rla: Difference between revisions
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==Overview== | ==Overview== | ||
Arginase is a thermostable (Tm = 75 degrees C) binuclear manganese, metalloenzyme which hydrolyzes l-arginine to form l-ornithine and urea., The three-dimensional structures of native metal-depleted arginase, metal-loaded H101N arginase, and metal-depleted H101N arginase have been, determined by X-ray crystallographic methods to probe the roles of the, manganese ion in site A (Mn2+A) and its ligand H101 in catalysis and, thermostability. We correlate these structures with thermal stability and, catalytic activity measurements reported here and elsewhere [Cavalli, R., C., Burke, C. J., Kawamoto, S., Soprano, D. R., and Ash, D. E. (1994), Biochemistry 33, 10652-10657]. We conclude that the substitution of a, wild-type histidine ligand to Mn2+A compromises metal binding, which in, turn .. | Arginase is a thermostable (Tm = 75 degrees C) binuclear manganese, metalloenzyme which hydrolyzes l-arginine to form l-ornithine and urea., The three-dimensional structures of native metal-depleted arginase, metal-loaded H101N arginase, and metal-depleted H101N arginase have been, determined by X-ray crystallographic methods to probe the roles of the, manganese ion in site A (Mn2+A) and its ligand H101 in catalysis and, thermostability. We correlate these structures with thermal stability and, catalytic activity measurements reported here and elsewhere [Cavalli, R., C., Burke, C. J., Kawamoto, S., Soprano, D. R., and Ash, D. E. (1994), Biochemistry 33, 10652-10657]. We conclude that the substitution of a, wild-type histidine ligand to Mn2+A compromises metal binding, which in, turn compromises protein thermostability and catalytic function., Therefore, a fully occupied binuclear manganese metal cluster is required, for optimal catalysis and thermostability. | ||
==About this Structure== | ==About this Structure== | ||
4RLA is a | 4RLA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus] with MN as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Arginase Arginase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.3.1 3.5.3.1] Structure known Active Sites: MNA, MNB and MNC. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=4RLA OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: urea cycle]] | [[Category: urea cycle]] | ||
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 12:44:29 2007'' | ||
