1lra

CRYSTALLOGRAPHIC STUDY OF GLU 58 ALA RNASE T1(ASTERISK)2'-GUANOSINE MONOPHOSPHATE AT 1.9 ANGSTROMS RESOLUTION

spinqualitylabelsall models 1lra, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1lra is a 1 chain structure with sequence from Aspergillus oryzae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: 2GP, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RNT1_ASPOR 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 Glu58 is known to participate in phosphodiester transesterification catalyzed by the enzyme RNase T1. For Glu58 RNase T1, an altered mechanism has been proposed in which His40 replaces Glu58 as the base catalyst [Steyaert, J., Hallenga, K., Wyns, L., & Stanssens, P. (1990) Biochemistry 29, 9064-9072]. Glu58Ala Rnase T1 has been cocrystallized with guanosine 2'-monophosphate (2'-GMP). The crystals are of space group P2(1), with one molecule per asymmetric unit (a = 32.44 A, b = 49.64 A, c = 26.09 A, beta = 99.17 degrees). The three-dimensional structure of the enzyme was determined to a nominal resolution of 1.9 A, yielding a crystallographic R factor of 0.178 for all X-ray data. Comparison of this structure with wild-type structures leads to the following conclusions. The minor changes apparent in the tertiary structure can be explained by either the mutation of Glu58 or by the change in the space group. In the active site, the extra space available through the mutation of Glu58 is occupied by the phosphate group (after a reorientation) and by a solvent molecule replacing a carboxylate oxygen of Glu58. This solvent molecule is a candidate for participation in the altered mechanism of this mutant enzyme. Following up on a study of conserved water sites in RNase T1 crystallized in space group P2(1)2(1)2(1) [Malin, R., Zielenkiewicz, P., & Saenger, W. (1991) J. Mol. Biol. 266, 4848-4852], we investigated the hydration structure for four different packing modes of RNase T1.(ABSTRACT TRUNCATED AT 250 WORDS) Crystallographic study of Glu58Ala RNase T1 x 2'-guanosine monophosphate at 1.9-A resolution.,Pletinckx J, Steyaert J, Zegers I, Choe HW, Heinemann U, Wyns L Biochemistry. 1994 Feb 22;33(7):1654-62. PMID:7906540 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease 3D structures

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