NMR strcutre of sst1-selective somatostatin (SRIF) analog 1

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: target function 

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This is version 1.3 of the entry. See complete history


Somatostatin receptor 1 selective analogues: 4. Three-dimensional consensus structure by NMR

Grace, C.R.R.Durrer, L.Koerber, S.C.Erchegyi, J.Reubi, J.C.Rivier, J.E.Riek, R.

(2005) J Med Chem 48: 523-533

  • DOI: https://doi.org/10.1021/jm049518u
  • Primary Citation of Related Structures:  
    1XXZ, 1XY4, 1XY5, 1XY6, 1XY8, 1XY9

  • PubMed Abstract: 

    The three-dimensional NMR structures of six analogues of somatostatin (SRIF) are described. These analogues with the amino acid 4-(N-isopropyl)-aminomethylphenylalanine (IAmp) at position 9 exhibit potent and highly selective binding to human SRIF subtype 1 receptors (sst(1)). The conformations reveal that the backbones of these analogues have a hairpin-like structure similar to the sst(2)-subtype-selective analogues. This structure serves as a scaffold for retaining a unique arrangement of the side chains of d-Trp(8), IAmp(9), Phe(7), and Phe(11) or m-I-Tyr(11) (m-I-Tyr = mono-iodo-tyrosine). The conformational preferences and results from biological analyses of these analogues(1,2) allow a detailed study of the structure-activity relationship of SRIF. The proposed consensus pharmacophore of the sst(1)-selective analogues requires a unique set of distances between an indole/2-naphthyl ring, an IAmp side chain, and two aromatic rings. This motif is necessary and sufficient to explain the binding affinities of all of the analogues studied and is distinct from the existing models suggested for sst(4) as well as sst(2)/sst(5) selectivity.

  • Organizational Affiliation

    Structural Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SST1-selective somatosatin analog12N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on IAM
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: target function 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-02-15
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-09-28
    Changes: Structure summary