Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 25 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


The solution structure of melanoma growth stimulating activity.

Fairbrother, W.J.Reilly, D.Colby, T.J.Hesselgesser, J.Horuk, R.

(1994) J Mol Biol 242: 252-270

  • DOI: https://doi.org/10.1006/jmbi.1994.1577
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The solution structure of melanoma growth stimulating activity (MGSA), a dimeric chemokine consisting of 73 residues per monomer, has been determined using two-dimensional homonuclear and three-dimensional heteronuclear NMR spectroscopy. Structure calculations were carried out using a hybrid distance geometry-simulated annealing approach with the programs DGII and X-PLOR. The structure is based on a total of 2362 experimental restraints, comprising 2150 NOE-derived distance restraints (2076 unambiguous intrasubunit restraints, 60 unambiguous intersubunit restraints, and 14 ambiguous restraints with potential contributions from both intra- and intersubunit NOEs), 84 distance restraints for 42 backbone hydrogen bonds, and 128 torsion angle restraints. The ambiguous distance restraints were treated using a target function which accounts for both intra- and intermolecular contributions to the NOE intensity. A total of 25 structures were calculated, with the backbone (N, C alpha, C) atomic r.m.s. distribution about the mean coordinates for residues 8 to 69 being 0.44(+/- 0.10) A for the dimer and 0.34(+/- 0.07) A for the individual monomers. The N- and C-terminal residues (1 to 7 and 70 to 73, respectively) are disordered. The overall structure of the MGSA dimer is similar to that reported previously for the NMR and X-ray structures of interleukin-8 (IL-8), and consists of a six-stranded antiparallel beta-sheet packed against two C-terminal antiparallel alpha-helices. A best fit superposition of the NMR structure of MGSA on the X-ray and NMR structures of IL-8 yields backbone atomic r.m.s. differences of 0.99 and 1.28 A, respectively for individual monomers, and 1.08 and 1.82 A, respectively for the dimers (using MGSA residues 8 to 14 and 19 to 69). In general, the MGSA structure resembles the IL-8 X-ray structure more than it does the IL-8 NMR structure. At the tertiary (monomer) level the two main differences between the MGSA solution structure and IL-8 NMR structure involve the loops between residues 14 to 19 and between residues 30 to 38. At the quaternary (dimer) level the difference results from differing angles between the beta-strands which form the dimer interface, and is manifest as a different interhelical separation (distance of closest approach between the two helices is 15.3 A in the IL-8 NMR structure and 11.7 (+/- 0.4) A in the MGSA structure).

  • Organizational Affiliation

    Department of Protein Engineering, Genentech, Inc., South San Francisco, CA 94080-4990.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
73Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P09341 (Homo sapiens)
Explore P09341 
Go to UniProtKB:  P09341
PHAROS:  P09341
GTEx:  ENSG00000163739 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09341
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 25 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1994-09-30
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Database references, Derived calculations, Other