4Z0U

RNase HI/SSB-Ct complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Interaction with Single-stranded DNA-binding Protein Stimulates Escherichia coli Ribonuclease HI Enzymatic Activity.

Petzold, C.Marceau, A.H.Miller, K.H.Marqusee, S.Keck, J.L.

(2015) J.Biol.Chem. 290: 14626-14636

  • DOI: 10.1074/jbc.M115.655134

  • PubMed Abstract: 
  • Single-stranded (ss) DNA-binding proteins (SSBs) bind and protect ssDNA intermediates formed during replication, recombination, and repair reactions. SSBs also directly interact with many different genome maintenance proteins to stimulate their enzym ...

    Single-stranded (ss) DNA-binding proteins (SSBs) bind and protect ssDNA intermediates formed during replication, recombination, and repair reactions. SSBs also directly interact with many different genome maintenance proteins to stimulate their enzymatic activities and/or mediate their proper cellular localization. We have identified an interaction formed between Escherichia coli SSB and ribonuclease HI (RNase HI), an enzyme that hydrolyzes RNA in RNA/DNA hybrids. The RNase HI·SSB complex forms by RNase HI binding the intrinsically disordered C terminus of SSB (SSB-Ct), a mode of interaction that is shared among all SSB interaction partners examined to date. Residues that comprise the SSB-Ct binding site are conserved among bacterial RNase HI enzymes, suggesting that RNase HI·SSB complexes are present in many bacterial species and that retaining the interaction is important for its cellular function. A steady-state kinetic analysis shows that interaction with SSB stimulates RNase HI activity by lowering the reaction Km. SSB or RNase HI protein variants that disrupt complex formation nullify this effect. Collectively our findings identify a direct RNase HI/SSB interaction that could play a role in targeting RNase HI activity to RNA/DNA hybrid substrates within the genome.


    Organizational Affiliation

    From the Department of Biomolecular Chemistry, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53706 and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease H
A, B
155Escherichia coli O139:H28 (strain E24377A / ETEC)Mutation(s): 0 
Gene Names: rnhA
EC: 3.1.26.4
Find proteins for A7ZHV1 (Escherichia coli O139:H28 (strain E24377A / ETEC))
Go to UniProtKB:  A7ZHV1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SSB-Ct Peptide
D, E
10Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: ssb (exrB, lexC)
Find proteins for P0AGE0 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AGE0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.211 
  • Space Group: P 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 60.498α = 90.00
b = 64.855β = 90.00
c = 79.726γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM0987885
National Science Foundation (United States)United StatesDGE-1256259

Revision History 

  • Version 1.0: 2015-04-29
    Type: Initial release
  • Version 1.1: 2016-03-30
    Type: Database references
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence, Database references, Derived calculations, Refinement description