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1ril

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{{STRUCTURE_1ril| PDB=1ril | SCENE= }}
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'''CRYSTAL STRUCTURE OF RIBONUCLEASE H FROM THERMUS THERMOPHILUS HB8 REFINED AT 2.8 ANGSTROMS RESOLUTION'''
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===CRYSTAL STRUCTURE OF RIBONUCLEASE H FROM THERMUS THERMOPHILUS HB8 REFINED AT 2.8 ANGSTROMS RESOLUTION===
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==Overview==
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The crystal structure of Thermus thermophilus RNase H was determined at 2.8 A resolution. The structure was solved by the molecular replacement method, based on the accurately refined structure of Escherichia coli RNase HI, which shows 52% amino acid sequence identity. Crystallographic refinement led to an R-factor of 0.205, with a 0.019 A root-mean-square deviation from ideal bond lengths and 0.048 A from ideal bond angle distances. Structural comparison shows a striking similarity in the overall folding of the thermophilic and mesophilic enzymes. The root-mean-square displacement is 0.95 A between equivalent alpha-carbon atoms from all elements of secondary structure (five alpha-helices and five beta-strands). However, some notable differences, which account for the enhanced thermostability of T. thermophilus RNase H, are observed in loop structures and side-chain conformations. The substitution of Gly for the left-handed helical residue (Lys95) in the E. coli enzyme is proposed to substantially enhance the thermostability, due to the release of steric hindrance caused by the beta-carbon atom. Furthermore, it is likely that the expansion of an aromatic cluster, arising from the replacement of Ile78 in the mesophilic enzyme by Phe, and the increased number of salt-bridges additively contribute to the stability.
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{{ABSTRACT_PUBMED_8385228}}
==About this Structure==
==About this Structure==
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[[Category: Nakamura, H.]]
[[Category: Nakamura, H.]]
[[Category: Okumura, M.]]
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Revision as of 00:02, 29 July 2008

Image:1ril.png

Template:STRUCTURE 1ril

CRYSTAL STRUCTURE OF RIBONUCLEASE H FROM THERMUS THERMOPHILUS HB8 REFINED AT 2.8 ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 8385228

About this Structure

1RIL is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Crystal structure of ribonuclease H from Thermus thermophilus HB8 refined at 2.8 A resolution., Ishikawa K, Okumura M, Katayanagi K, Kimura S, Kanaya S, Nakamura H, Morikawa K, J Mol Biol. 1993 Mar 20;230(2):529-42. PMID:8385228

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