1FIP

THE STRUCTURE OF FIS MUTANT PRO61ALA ILLUSTRATES THAT THE KINK WITHIN THE LONG ALPHA-HELIX IS NOT DUE TO THE PRESENCE OF THE PROLINE RESIDUE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The structure of Fis mutant Pro61Ala illustrates that the kink within the long alpha-helix is not due to the presence of the proline residue.

Yuan, H.S.Wang, S.S.Yang, W.Z.Finkel, S.E.Johnson, R.C.

(1994) J.Biol.Chem. 269: 28947-28954


  • PubMed Abstract: 
  • The influence of proline on bending of the alpha-helix was investigated by replacement of the proline residue located in the middle of the long alpha-helix of the Fis protein with alanine, serine, or leucine. Each of the three substitutions folded in ...

    The influence of proline on bending of the alpha-helix was investigated by replacement of the proline residue located in the middle of the long alpha-helix of the Fis protein with alanine, serine, or leucine. Each of the three substitutions folded into a stable protein with the same or higher melting points than the wild-type, but only Pro61Ala was functionally active in stimulating Hin-mediated DNA inversion. Pro61Ala formed crystals that were isomorphous with the wild-type protein allowing the structure to be determined at 1.9-A resolution by x-ray diffraction methods. The structure of the Pro61Ala mutant is almost identical to the wild-type protein, consistent with its near wild-type activity. One of the alpha-helices, the B-helix, is kinked in the wild-type Fis protein by 20 degrees which was previously assumed to be caused solely by the presence of proline 61 in the center of the helix. However, the B-helix is still kinked by 16 degrees when proline 61 is replaced by alanine. Local peptide backbone movement around residue 57 adjusts the geometry of the helix to accommodate the new main chain hydrogen bond between the -CO group in Glu57 and the -NH group in Ala61. Thus, the kink of the alpha-helix in Pro61Ala does not require the presence of proline.


    Organizational Affiliation

    Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan, Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FACTOR FOR INVERSION STIMULATION (FIS)
A, B
98Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC)Gene Names: fis
Find proteins for P0A6R4 (Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC))
Go to UniProtKB:  P0A6R4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
UNKNOWN PEPTIDE, POSSIBLY PART OF THE UNOBSERVED RESIDUES IN ENTITY 1
C, D
4N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
C, D
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 79.080α = 90.00
b = 51.120β = 90.00
c = 47.290γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-02-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2015-08-05
    Type: Structure summary