Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.233 

Starting Model: experimental
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Structural analysis of the transcriptional activation on Fis: crystal structures of six Fis mutants with different activation properties.

Cheng, Y.S.Yang, W.Z.Johnson, R.C.Yuan, H.S.

(2000) J Mol Biol 302: 1139-1151

  • DOI: https://doi.org/10.1006/jmbi.2000.4123
  • Primary Citation of Related Structures:  
    1ETK, 1ETO, 1ETQ, 1ETV, 1ETW, 1ETX, 1ETY

  • PubMed Abstract: 

    The Fis protein regulates gene expression in Escherichia coli by activating or repressing transcription of a variety of genes. Fis can activate transcription when bound to DNA upstream of the RNA-polymerase-binding site, such as in the rrnB P1 promoter, or when bound to a site overlapping the -35 RNA polymerase binding site, such as in the proP P2 promoter. It has been suggested that transcriptional activation in both promoters results from interactions between specific amino acids within a turn connecting the B and C helices (the BC turn) in Fis and the C-terminal domain of the alpha-subunit of RNA polymerase (alphaCTD of RNAP). Here, crystal structures of six Fis BC turn mutants with different transcriptional activation properties, Q68A, R71Y, R71L, G72A, G72D and Q74A, were determined at 1.9 to 2.8 A resolution. Two of these mutants, R71Y and R71L, crystallized in unit cells which are different from that of wild-type Fis, and the structure of R71L offers the most complete Fis model to date in that the extended structure of the N-terminal region is revealed. The BC turn in all of these mutant structures remains in a nearly identical gamma gamma beta-turn conformation as present in wild-type Fis. Analyses of the molecular surfaces of the transactivation region of the mutants suggest that several residues in or near the BC turn, including Gln68, Arg71, Gly72 and Gln74, form a ridge that could contact the alphaCTD of RNAP on one side. The structures and biochemical properties of the mutants suggest that Arg71 is the most critical residue for contacting RNAP within this ridge and that the glycine at position 72 helps to stabilize the structure.

  • Organizational Affiliation

    Graduate Institute of Life Science, National Defense Medical Center, Taipei, Taiwan, Republic of China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
98Escherichia coliMutation(s): 0 
Find proteins for P0A6R3 (Escherichia coli (strain K12))
Explore P0A6R3 
Go to UniProtKB:  P0A6R3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A6R3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.233 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.47α = 90
b = 50.36β = 90
c = 47.7γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-10-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references
  • Version 1.4: 2024-04-03
    Changes: Refinement description