1gov
From Proteopedia
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==Overview== | ==Overview== | ||
| - | The structures of Bacillus intermedius ribonuclease (binase), an | + | The structures of Bacillus intermedius ribonuclease (binase), an extracellular 109-residue enzyme, and its complexes with 3'GMP and sulfate ions were solved at 1.65 and 2.0 A, respectively. The structures were refined using REFMAC. The crystal of free binase belongs to the space group C2, whereas the crystals of complexes belong to the space group P2(1)2(1)2(1). In both crystal lattices the asymmetric unit contains two molecules which form an identical dimer. The structure of the dimer is such that only one of its subunits can bind the nucleotide in the 3'GMP-binase complex, where the guanyl base is located in the recognition loop of the enzyme. In both binase complex structures the phosphate group of 3'GMP or one of the sulfate ions make an electrostatic interaction with the binase molecule at the catalytic site. A second phosphate-binding site was found in the structures of the complexes at the cleft formed by the loop 34-39, the main chain of Arg82 and the side chain of Trp34. Comparison of the complex and unliganded enzyme crystal structures shows that there are some small but distinct differences in the specificity loop (56-62) and in the loops 34-39 and 99-104 associated with the binding of the nucleotide and sulfate ions. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Ribonuclease T(1)]] | [[Category: Ribonuclease T(1)]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Dodson, G | + | [[Category: Dodson, G G.]] |
| - | [[Category: Lebedev, A | + | [[Category: Lebedev, A A.]] |
| - | [[Category: Pavlovsky, A | + | [[Category: Pavlovsky, A G.]] |
| - | [[Category: Polyakov, K | + | [[Category: Polyakov, K M.]] |
| - | [[Category: Sanishvili, R | + | [[Category: Sanishvili, R G.]] |
[[Category: SO4]] | [[Category: SO4]] | ||
[[Category: endoribonuclease]] | [[Category: endoribonuclease]] | ||
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[[Category: nuclease]] | [[Category: nuclease]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:52:23 2008'' |
Revision as of 10:52, 21 February 2008
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RIBONUCLEASE BI(G SPECIFIC ENDONUCLEASE) COMPLEXED WITH SULFATE IONS
Overview
The structures of Bacillus intermedius ribonuclease (binase), an extracellular 109-residue enzyme, and its complexes with 3'GMP and sulfate ions were solved at 1.65 and 2.0 A, respectively. The structures were refined using REFMAC. The crystal of free binase belongs to the space group C2, whereas the crystals of complexes belong to the space group P2(1)2(1)2(1). In both crystal lattices the asymmetric unit contains two molecules which form an identical dimer. The structure of the dimer is such that only one of its subunits can bind the nucleotide in the 3'GMP-binase complex, where the guanyl base is located in the recognition loop of the enzyme. In both binase complex structures the phosphate group of 3'GMP or one of the sulfate ions make an electrostatic interaction with the binase molecule at the catalytic site. A second phosphate-binding site was found in the structures of the complexes at the cleft formed by the loop 34-39, the main chain of Arg82 and the side chain of Trp34. Comparison of the complex and unliganded enzyme crystal structures shows that there are some small but distinct differences in the specificity loop (56-62) and in the loops 34-39 and 99-104 associated with the binding of the nucleotide and sulfate ions.
About this Structure
1GOV is a Single protein structure of sequence from Bacillus intermedius with as ligand. Active as Ribonuclease T(1), with EC number 3.1.27.3 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
The structure of substrate-free microbial ribonuclease binase and of its complexes with 3'GMP and sulfate ions., Polyakov KM, Lebedev AA, Okorokov AL, Panov KI, Schulga AA, Pavlovsky AG, Karpeisky MY, Dodson GG, Acta Crystallogr D Biol Crystallogr. 2002 May;58(Pt 5):744-50. Epub 2002, Apr 26. PMID:11976484
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