1JQZ

Human Acidic Fibroblast Growth Factor. 141 Amino Acid Form with Amino Terminal His Tag.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structure and stability effects of mutations designed to increase the primary sequence symmetry within the core region of a beta-trefoil.

Brych, S.R.Blaber, S.I.Logan, T.M.Blaber, M.

(2001) Protein Sci 10: 2587-2599

  • DOI: https://doi.org/10.1110/ps.ps.34701
  • Primary Citation of Related Structures:  
    1JQZ, 1JT3, 1JT4, 1JT5, 1JT7, 1JTC

  • PubMed Abstract: 

    Human acidic fibroblast growth factor (FGF-1) is a member of the beta-trefoil hyperfamily and exhibits a characteristic threefold symmetry of the tertiary structure. However, evidence of this symmetry is not readily apparent at the level of the primary sequence. This suggests that while selective pressures may exist to retain (or converge upon) a symmetric tertiary structure, other selective pressures have resulted in divergence of the primary sequence during evolution. Using intra-chain and homologue sequence comparisons for 19 members of this family of proteins, we have designed mutants of FGF-1 that constrain a subset of core-packing residues to threefold symmetry at the level of the primary sequence. The consequences of these mutations regarding structure and stability were evaluated using a combination of X-ray crystallography and differential scanning calorimetry. The mutational effects on structure and stability can be rationalized through the characterization of "microcavities" within the core detected using a 1.0A probe radius. The results show that the symmetric constraint within the primary sequence is compatible with a well-packed core and near wild-type stability. However, despite the general maintenance of overall thermal stability, a noticeable increase in non-two-state denaturation follows the increase in primary sequence symmetry. Therefore, properties of folding, rather than stability, may contribute to the selective pressure for asymmetric primary core sequences within symmetric protein architectures.


  • Organizational Affiliation

    Institute of Molecular Biophysics and Department of Chemistry and Biochemistry, Florida State University, Tallahassee Florida 32306-4380, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
acidic fibroblast growth factor
A, B
146Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05230 (Homo sapiens)
Explore P05230 
Go to UniProtKB:  P05230
PHAROS:  P05230
GTEx:  ENSG00000113578 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05230
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.057α = 90
b = 96.839β = 90
c = 109.03γ = 90
Software Package:
Software NamePurpose
MRCHKmodel building
TNTrefinement
DENZOdata reduction
SCALEPACKdata scaling
MRCHKphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-19
    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: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description