Crystallographic study of Glu58Ala RNase T1 x 2'-guanosine monophosphate at 1.9-A resolution.Pletinckx, J., Steyaert, J., Zegers, I., Choe, H.W., Heinemann, U., Wyns, L.
(1994) Biochemistry 33: 1654-1662
- PubMed: 7906540
- PubMed Abstract:
- The Structural and Sequence Homology of a Family of Microbial Ribonucleases
Hill, C.,Dodson, G.,Heinemann, U.,Saenger, W.,Mitsui, Y.,Nakamura, K.,Borisov, S.,Tischenko, G.,Polyakov, K.,Pavlovsky, S.
(1983) Trends Biochem.Sci.(Pers. Ed.) 8: 364
- Histidine-40 of Ribonuclease T1Acts as Base Catalyst When the True Catalytic Base, Glutamic Acid 58 is Replaced by Alanine
Steyaert, J.,Hallenga, K.,Wyns, L.,Stanssens, P.
(1990) Biochemistry 29: 9064
- Ribonuclease T1 with Free Recognition and Catalytic Site: Crystal Structure Analysis at 1.5 Angstroms
Martinez-Oyanedel, J.,Choe, H.-W.,Heinemann, U.,Saenger, W.
(1991) J.Mol.Biol. 222: 335
- Crystallographic Study of Mechanism of Ribonuclease T1-Catalysed Specific RNA Hydrolysis
Heinemann, U.,Saenger, W.
(1983) J.Biomol.Struct.Dyn. 1: 523
- Restrained Least-Squares Refinement of the Crystal Structure of the Ribonuclease T1(Asterisk)2'-Guanylic Acid Complex at 1.9 Angstroms Resolution
Arni, R.,Heinemann, U.,Maslowska, M.,Tokuoka, R.,Saenger, W.
(1987) Acta Crystallogr.,Sect.B 43: 549
- Crystallization of a Complex between Ribonuclease T1 and 2'-Guanylic Acid
Heinemann, U.,Wernitz, M.,Paehler, A.,Saenger, W.,Menke, G.,Rueterjans, H.
(1980) Eur.J.Biochem. 109: 109
- Three-Dimensional Structure of Ribonuclease T1 Complexed with Guanylyl-2',5'-Guanosine at 1.8 Angstroms Resolution
Koepke, J.,Maslowska, M.,Heinemann, U.,Saenger, W.
(1989) J.Mol.Biol. 206: 475
- Three-Dimensional Structure of the Ribonuclease T1(Asterisk)2'-Gmp Complex at 1.9-Angstroms Resolution
Arni, R.,Heinemann, U.,Tokuoka, R.,Saenger, W.
(1988) J.Biol.Chem. 263: 15358
- Specific Protein-Nucleic Acid Recognition in Ribonuclease T1-2'-Guanylic Acid Complex. An X-Ray Study
Heinemann, U.,Saenger, W.
(1982) Nature 299: 27
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., ...
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)
Instituut voor Moleculaire Biologie, Vrije Universiteit Brussel, Belgium.