4bir

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[[Image:4bir.gif|left|200px]]
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{{Seed}}
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[[Image:4bir.png|left|200px]]
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{{STRUCTURE_4bir| PDB=4bir | SCENE= }}
{{STRUCTURE_4bir| PDB=4bir | SCENE= }}
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'''RIBONUCLEASE T1: FREE HIS92GLN MUTANT'''
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===RIBONUCLEASE T1: FREE HIS92GLN MUTANT===
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==Overview==
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Histidine-40 is known to participate in phosphodiester transesterification catalyzed by the enzyme ribonuclease T1. A mutant enzyme with a lysine replacing the histidine-40 (His40Lys RNase T1) retains considerable catalytic activity [Steyaert, J., Hallenga, K., Wyns, L., &amp; Stanssens, P. (1990) Biochemistry 29, 9064-9072]. We report on the crystal structures of His40Lys RNase T1 containing a phosphate anion and a guanosine 2'-phosphate inhibitor in the active site, respectively. Similar to previously described structures, the phosphate-containing crystals are of space group P2(1)2(1)2(1), with one molecule per asymmetric unit (a = 48.27 A, b = 46.50 A, c = 41.14 A). The complex with 2'-GMP crystallized in the lower symmetry space group P2(1), with two molecules per asymmetric unit (a = 49.20 A, b = 48.19 A, c = 40.16 A, beta = 90.26). The crystal structures have been solved at 1.8- and 2.0-A resolution yielding R values of 14.5% and 16.0%, respectively. Comparison of these His40Lys structures with the corresponding wild-type structures, containing 2'-GMP [Arni, R., Heinemann, U., Tokuoka, R., &amp; Saenger, W. (1988) J. Biol. Chem. 263, 15358-15368] and vanadate [Kostrewa, D., Hui-Woog Choe, Heinemann, U., &amp; Saenger, W. (1989) Biochemistry 28, 7692-7600] in the active site, respectively, leads to the following conclusions. First, the His40Lys mutation causes no significant changes in the overall structure of RNase T1; second, the Lys40 side chains in the mutant structures occupy roughly the same space as His40 in the corresponding wild-type RNase T1 structures.(ABSTRACT TRUNCATED AT 250 WORDS)
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{{ABSTRACT_PUBMED_1445870}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Ribonuclease]]
[[Category: Ribonuclease]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 13:29:41 2008''

Revision as of 10:29, 3 July 2008

Image:4bir.png

Template:STRUCTURE 4bir

RIBONUCLEASE T1: FREE HIS92GLN MUTANT

Template:ABSTRACT PUBMED 1445870

About this Structure

4BIR is a Single protein structure of sequence from Aspergillus oryzae. Full crystallographic information is available from OCA.

Reference

Role of histidine-40 in ribonuclease T1 catalysis: three-dimensionalstructures of the partially active His40Lys mutant., Zegers I, Verhelst P, Choe HW, Steyaert J, Heinemann U, Saenger W, Wyns L, Biochemistry. 1992 Nov 24;31(46):11317-25. PMID:1445870

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