1GO9

Monitoring the structural Consequences of Phe12-->D-Phe12 and Leu15-->Aib15 substitution in h/r Corticotropin Releasing Hormone: Implications for Design of CRH antagonists.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

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Literature

Monitoring the Structural Consequences of Phe12-->D-Phe and Leu15-->Aib Substitution in Human/Rat Corticotropin Releasing Hormone. Implications for Design of Crh Antagonists.

Spyroulias, G.A.Papazacharias, S.Pairas, G.Cordopatis, P.

(2002) Eur J Biochem 269: 6009

  • DOI: 10.1046/j.1432-1033.2002.03278.x
  • Primary Citation of Related Structures:  
    1GO9, 1GOE

  • PubMed Abstract: 
  • A new human/rat CRH analogue has been synthesized using the Fmoc/tBu solid-phase synthetic protocol. The sequence of the new peptide differs from the original in two positions, 12 and 15, at which the native amino acids l-phenylalanine 12 and l-leucine 15 have been replaced by the nonprotein amino acids d-phenylalanine and alpha-aminoisobutyric acid (Aib), respectively ...

    A new human/rat CRH analogue has been synthesized using the Fmoc/tBu solid-phase synthetic protocol. The sequence of the new peptide differs from the original in two positions, 12 and 15, at which the native amino acids l-phenylalanine 12 and l-leucine 15 have been replaced by the nonprotein amino acids d-phenylalanine and alpha-aminoisobutyric acid (Aib), respectively. The high resolution three-dimensional solution structure of [d-Phe12, Aib15]CRH has been determined by 688 distance constraints (656 meaningful NOE and 32 H-bonds distance limits) and 21 angle constraints. A family of 40 energy-minimized conformers was obtained with average rmsd of 0.39 +/- 0.16 A and 0.99 +/- 0.13 A for backbone and heavy atoms, respectively, and distance penalty functions of 0.42 +/- 0.03 A2. The NMR data acquired in a solvent system of water/trifluoroethanol (34%/66%, v/v) revealed that this 41-polypeptide adopts an almost linear helical structure in solution with helical content which reaches an 84% of the residues. Structural analysis confirmed the existence of two helical peptide fragments. The first was comprised of residues Ile6-Arg16 and the second of residues Glu20-Ile40, forming an angle of 34.2 degrees. The structural differences with respect to the native peptide have been identified in the region d-Phe12-Glu20 where double substitution at positions 12 and 15 seems to perturb the elements of the native 35-residue helix. These structural rearrangements promote non-native intramolecular interactions in the region of the molecule between either the hydrophobic side-chains of d-Phe12, Aib15 and Leu18, or the charged groups of the residue pairs Arg16-Glu20 and His13-Glu17 being responsible for changes in hormonal functionality. This CRH analogue currently exhibits lack of any activity.


    Related Citations: 
    • Solution Structure of Human Corticotropin Releasing Factor by 1H NMR and Distance Geometry with Restrained Molecular Dynamics.
      Romier, C., Bernassau, J.M., Cambillau, C., Darbon, H.
      (1993) Protein Eng 6: 149

    Organizational Affiliation

    Department of Pharmacy, University of Patras, Greece.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CORTICOTROPIN RELEASING HORMONEA42Homo sapiensMutation(s): 3 
Gene Names: CRH
UniProt & NIH Common Fund Data Resources
Find proteins for P06850 (Homo sapiens)
Explore P06850 
Go to UniProtKB:  P06850
PHAROS:  P06850
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06850
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
AIB
Query on AIB
A L-PEPTIDE LINKINGC4 H9 N O2ALA
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 
  • OLDERADO: 1GO9 Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-31
    Type: Initial release
  • Version 1.1: 2016-12-21
    Changes: Database references, Derived calculations, Other, Source and taxonomy, Structure summary, Version format compliance