3U3G

Structure of LC11-RNase H1 Isolated from Compost by Metagenomic Approach: Insight into the Structural Bases for Unusual Enzymatic Properties of Sto-RNase H1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Activity, stability, and structure of metagenome-derived LC11-RNase H1, a homolog of Sulfolobus tokodaii RNase H1

Nguyen, T.N.Angkawidjaja, C.Kanaya, E.Koga, Y.Takano, K.Kanaya, S.

(2012) Protein Sci. 21: 553-561

  • DOI: 10.1002/pro.2043

  • PubMed Abstract: 
  • Metagenome-derived LC11-RNase H1 is a homolog of Sulfolobus tokodaii RNase H1 (Sto-RNase H1). It lacks a C-terminal tail, which is responsible for hyperstabilization of Sto-RNase H1. Sto-RNase H1 is characterized by its ability to cleave not only an ...

    Metagenome-derived LC11-RNase H1 is a homolog of Sulfolobus tokodaii RNase H1 (Sto-RNase H1). It lacks a C-terminal tail, which is responsible for hyperstabilization of Sto-RNase H1. Sto-RNase H1 is characterized by its ability to cleave not only an RNA/DNA hybrid but also a double-stranded RNA (dsRNA). To examine whether LC11-RNase H1 also exhibits both RNase H and dsRNase activities, LC11-RNase H1 was overproduced in Escherichia coli, purified, and characterized. LC11-RNase H1 exhibited RNase H activity with similar metal ion preference, optimum pH, and cleavage mode of substrate with those of Sto-RNase H1. However, LC11-RNase H1 did not exhibit dsRNase activity at any condition examined. LC11-RNase H1 was less stable than Sto-RNases H1 and its derivative lacking the C-terminal tail (Sto-RNase H1ΔC6) by 37 and 13 °C in T(m) , respectively. To understand the structural bases for these differences, the crystal structure of LC11-RNase H1 was determined at 1.4 Å resolution. The LC11-RNase H1 structure is highly similar to the Sto-RNase H1 structure. However, LC11-RNase H1 has two grooves on protein surface, one containing the active site and the other containing DNA-phosphate binding pocket, while Sto-RNase H1 has one groove containing the active site. In addition, LC11-RNase H1 contains more cavities and buried charged residues than Sto-RNase H1. We propose that LC11-RNase H1 does not exhibit dsRNase activity because dsRNA cannot fit to the two grooves on protein surface and that LC11-RNase H1 is less stable than Sto-RNase H1ΔC6 because of the increase in cavity volume and number of buried charged residues.


    Organizational Affiliation

    Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease H
D, B, C, A
140uncultured organismMutation(s): 0 
EC: 3.1.26.4
Find proteins for E0X767 (uncultured organism)
Go to UniProtKB:  E0X767
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.172 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 54.315α = 90.00
b = 104.891β = 110.34
c = 57.212γ = 90.00
Software Package:
Software NamePurpose
BL44XUdata collection
BALBESphasing
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2012-06-06
    Type: Database references