2GLH

Solution Conformation of Salmon Calcitonin in Sodium Dodecyl Sulfate Micelles


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 100 
  • Selection Criteria: periodically sampled unrestrained molecular dynamics structures 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural determinants of salmon calcitonin bioactivity: the role of the Leu-based amphipathic alpha-helix.

Andreotti, G.Mendez, B.L.Amodeo, P.Morelli, M.A.Nakamuta, H.Motta, A.

(2006) J.Biol.Chem. 281: 24193-24203

  • DOI: 10.1074/jbc.M603528200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Salmon calcitonin (sCT) forms an amphipathic helix in the region 9-19, with the C-terminal decapeptide interacting with the helix (Amodeo, P., Motta, A., Strazzullo, G., Castiglione Morelli, M. A. (1999) J. Biomol. NMR 13, 161-174). To uncover the st ...

    Salmon calcitonin (sCT) forms an amphipathic helix in the region 9-19, with the C-terminal decapeptide interacting with the helix (Amodeo, P., Motta, A., Strazzullo, G., Castiglione Morelli, M. A. (1999) J. Biomol. NMR 13, 161-174). To uncover the structural requirements for the hormone bioactivity, we investigated several sCT analogs. They were designed so as to alter the length of the central helix by removal and/or replacement of flanking residues and by selectively mutating or deleting residues inside the helix. The helix content was assessed by circular dichroism and NMR spectroscopies; the receptor binding affinity in human breast cancer cell line T 47D and the in vivo hypocalcemic activity were also evaluated. In particular, by NMR spectroscopy and molecular dynamics calculations we studied Leu(23),Ala(24)-sCT in which Pro(23) and Arg(24) were replaced by helix inducing residues. Compared with sCT, it assumes a longer amphipathic alpha-helix, with decreased binding affinity and one-fifth of the hypocalcemic activity, therefore supporting the idea of a relationship between a definite helix length and bioactivity. From the analysis of other sCT mutants, we inferred that the correct helix length is located in the 9-19 region and requires long range interactions and the presence of specific regions of residues within the sequence for high binding affinity and hypocalcemic activity. Taken together, the structural and biological data identify well defined structural parameters of the helix for sCT bioactivity.


    Related Citations: 
    • Conformational flexibility in calcitonin: The dynamic properties of human and salmon calcitonin in solution
      Amodeo, P.,Motta, A.,Strazzullo, G.,Castiglione-Morelli, M.A.
      (1999) J.Biomol.NMR 13: 161
    • Solution Conformation of Salmon Calcitonin in Sodium Dodecyl Sulfate Micelles As Determined by Two-Dimensional NMR and Distance Geometry Calculations
      Motta, A.,Pastore, A.,Goud, N.A.,Castiglione-Morelli, M.A.
      (1991) Biochemistry 30: 10444


    Organizational Affiliation

    Istituto di Chimica Biomolecolare del Consiglio Nazionale delle Ricerche, Comprensorio Olivetti, Edificio A, 80078 Pozzuoli (Napoli), Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcitonin-1
A
33Oncorhynchus ketaMutation(s): 0 
Find proteins for P01263 (Oncorhynchus keta)
Go to UniProtKB:  P01263
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 100 
  • Selection Criteria: periodically sampled unrestrained molecular dynamics structures 
  • Olderado: 2GLH Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-20
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance