1JL2

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history. 

Literature

Contributions of folding cores to the thermostabilities of two ribonucleases H.

Robic, S., Berger, J.M., Marqusee, S.

(2002) Protein Sci. 11: 381-389

  • DOI: 10.1110/ps.38602

  • PubMed Abstract: 

    • To investigate the contribution of the folding cores to the thermodynamic stability of RNases H, we used rational design to create two chimeras composed of parts of a thermophilic and a mesophilic RNase H. Each chimera combines the folding core from ...

    To investigate the contribution of the folding cores to the thermodynamic stability of RNases H, we used rational design to create two chimeras composed of parts of a thermophilic and a mesophilic RNase H. Each chimera combines the folding core from one parent protein and the remaining parts of the other. Both chimeras form active, well-folded RNases H. Stability curves, based on CD-monitored chemical denaturations, show that the chimera with the thermophilic core is more stable, has a higher midpoint of thermal denaturation, and a lower change in heat capacity (DeltaCp) upon unfolding than the chimera with the mesophilic core. A possible explanation for the low DeltaCp of both the parent thermophilic RNase H and the chimera with the thermophilic core is the residual structure in the denatured state. On the basis of the studied parameters, the chimera with the thermophilic core resembles a true thermophilic protein. Our results suggest that the folding core plays an essential role in conferring thermodynamic parameters to RNases H.

    Organizational Affiliation: 

    Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chimera of Ribonuclease HI, Ribonuclease H
A, B, C, D
156Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579), Escherichia coli (strain K12)
This entity is chimeric		Mutation(s): 0 
Gene Names: rnhA, rnhA (dasF, herA, rnh, sdrA)
EC: 3.1.26.4 3.1.26.4
Find proteins for P29253 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  P29253
Find proteins for P0A7Y4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A7Y4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.249 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 56.195α = 90.00
b = 87.033β = 91.87
c = 60.687γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-01-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-06-28
    Type: Database references, Source and taxonomy, Structure summary