Structural distribution of stability in a thermophilic enzyme.


Stability parameters for individual residues in Thermus thermophilus cysteine-free RNase H were determined by native state hydrogen exchange, thus providing a unique comparison of regional thermodynamics between thermophilic and mesophilic homologues. The general distribution of stability in the thermophilic protein is similar to that of its mesophilic homologue, with a proportional increase in stability for almost all residues. As a consequence, the residue-specific stabilities of the two proteins are remarkably similar under conditions where their global stabilities are the same. These results indicate that T. thermophilus RNase H is stabilized in a delocalized fashion, preserving a finely tuned balance of stabilizing interactions throughout the structure. Therefore, although protein stability can be altered by single amino acid substitution, evolution for optimal function may require more subtle and delocalized mechanisms. Study holds ProTherm entries: 6450, 6451, 6452, 6453, 6454, 6455, 6456, 6457, 6458, 6459, 6460, 6461, 6462, 6463, 6464, 6465, 6466, 6467, 6468, 6469, 6470, 6471, 6472, 6473, 6474, 6475, 6476, 6477, 6478, 6479, 6480, 6481, 6482, 6483, 6484, 6485, 6486, 6487, 6488 Extra Details: stability parameters of native state hydrogen exchange at A10 stability parameter; thermophilic; mesophilic;,residue-specific stability; delocalized mechanism

Submission Details

ID: pq3deDWr3

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:32 p.m.

Version: 1

Publication Details
Hollien J;Marqusee S,Proc. Natl. Acad. Sci. U.S.A. (1999) Structural distribution of stability in a thermophilic enzyme. PMID:10570131
Additional Information

Structure view and single mutant data analysis

Study data

No weblogo for data of varying length.
Colors: D E R H K S T N Q A V I L M F Y W C G P

Data Distribution

Studies with similar sequences (approximate matches)

Correlation with other assays (exact sequence matches)

Relevant PDB Entries

Structure ID Release Date Resolution Structure Title
1JL2 2001-07-13T00:00:00+0000 1.76 Crystal structure of TCEO RNase H-a chimera combining the folding core from T. thermophilus RNase H and the remaining region of E. coli RNase H
2RPI 2008-05-16T00:00:00+0000 0 The NMR structure of the submillisecond folding intermediate of the Thermus thermophilus ribonuclease H

Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
98.8 Ribonuclease H Q72IE1 RNH_THET2
100.0 Ribonuclease H P29253 RNH_THET8