4bir
From Proteopedia
| Line 5: | Line 5: | ||
==Overview== | ==Overview== | ||
| - | 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., & 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 ... [[ | + | 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., & 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., & Saenger, W. (1988) J. Biol. Chem. 263, 15358-15368] and vanadate [Kostrewa, D., Hui-Woog Choe, Heinemann, U., &, 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) |
==About this Structure== | ==About this Structure== | ||
| - | 4BIR is a | + | 4BIR is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Aspergillus_oryzae Aspergillus oryzae] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Ribonuclease_T(1) Ribonuclease T(1)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.27.3 3.1.27.3] Structure known Active Site: CAT. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=4BIR OCA]. |
==Reference== | ==Reference== | ||
| Line 23: | Line 23: | ||
[[Category: ribonuclease]] | [[Category: ribonuclease]] | ||
| - | ''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 15:21:25 2007'' |
Revision as of 13:16, 5 November 2007
|
RIBONUCLEASE T1: FREE HIS92GLN MUTANT
Overview
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., & 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., & Saenger, W. (1988) J. Biol. Chem. 263, 15358-15368] and vanadate [Kostrewa, D., Hui-Woog Choe, Heinemann, U., &, 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)
About this Structure
4BIR is a Single protein structure of sequence from Aspergillus oryzae with CA as ligand. Active as Ribonuclease T(1), with EC number 3.1.27.3 Structure known Active Site: CAT. 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
Page seeded by OCA on Mon Nov 5 15:21:25 2007
