1NPP

CRYSTAL STRUCTURE OF AQUIFEX AEOLICUS NUSG IN P2(1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.259 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

A Spring-Loaded State of NusG in Its Functional Cycle Is Suggested by X-ray Crystallography and Supported by Site-Directed Mutants

Knowlton, J.R.Bubunenko, M.Andrykovitch, M.Guo, W.Routzahn, K.M.Waugh, D.S.Court, D.L.Ji, X.

(2003) Biochemistry 42: 2275-2281

  • DOI: https://doi.org/10.1021/bi0272508
  • Primary Citation of Related Structures:  
    1NPP, 1NPR

  • PubMed Abstract: 

    Transcription factor NusG is present in all prokaryotes, and orthologous proteins have also been identified in yeast and humans. NusG contains a 27-residue KOW motif, found in ribosomal protein L24 where it interacts with rRNA. NusG in Escherichia coli (EcNusG) is an essential protein and functions as a regulator of Rho-dependent transcription termination, phage lambda N and rRNA transcription antitermination, and phage HK022 Nun termination. Relative to EcNusG, Aquifex aeolicus NusG (AaNusG) and several other bacterial NusG proteins contain a variable insertion sequence of approximately 70 residues in the central region of the molecule. Recently, crystal structures of AaNusG in space groups P2(1) and I222 have been reported; the authors conclude that there are no conserved dimers among the contacting molecules in the crystals [Steiner, T., Kaiser, J. T., Marinkovic, S., Huber, R., and Wahl, M. C. (2002) EMBO J. 21, 4641-4653]. We have independently determined the structures of AaNusG also in two crystal forms, P2(1) and C222(1), and surprisingly found that AaNusG molecules form domain-swapped dimers in both crystals. Additionally, polymerization is also observed in the P2(1) crystal. A unique "ball-and-socket" junction dominates the intermolecular interactions within both oligomers. We believe that this interaction is a clue to the function of the molecule and propose a spring-loaded state in the functional cycle of NusG. The importance of the ball-and-socket junction for the function of NusG is supported by the functional analysis of site-directed mutants.


  • Organizational Affiliation

    Macromolecular Crystallography Laboratory, National Cancer Institute, P.O. Box B, Frederick, Maryland 21702, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription antitermination protein nusG
A, B, C, D
248Aquifex aeolicusMutation(s): 0 
Gene Names: NUSG OR AQ_1931
UniProt
Find proteins for O67757 (Aquifex aeolicus (strain VF5))
Explore O67757 
Go to UniProtKB:  O67757
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67757
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.259 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.07α = 90
b = 55.86β = 90.39
c = 112.61γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.4: 2024-10-30
    Changes: Structure summary