1AHL

ANTHOPLEURIN-A,NMR, 20 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Three-dimensional structure in solution of the polypeptide cardiac stimulant anthopleurin-A.

Pallaghy, P.K.Scanlon, M.J.Monks, S.A.Norton, R.S.

(1995) Biochemistry 34: 3782-3794


  • PubMed Abstract: 
  • The three-dimensional structure in aqueous solution of the 49-residue polypeptide anthopleurin-A (AP-A), from the sea anemone Anthopleura xanthogrammica, has been determined from 1H NMR data. A restraint set consisting of 411 interproton distance res ...

    The three-dimensional structure in aqueous solution of the 49-residue polypeptide anthopleurin-A (AP-A), from the sea anemone Anthopleura xanthogrammica, has been determined from 1H NMR data. A restraint set consisting of 411 interproton distance restraints inferred from NOEs and 19 backbone and 13 side chain dihedral angle restraints from spin-spin coupling constants, as well as 15 lower bound restraints based on the absence of NOEs in the spectra, was used as input for distance geometry calculations in DIANA and simulated annealing and restrained energy minimization in X-PLOR. Stereospecific assignments for 12 beta-methylene pairs were also included. The final set of 20 structures had mean pairwise rms differences over the whole molecule of 2.04 A for the backbone heavy atoms (N, C alpha, and C) and 2.59 A for all heavy atoms. For the well-defined region encompassing residues 2-7 and 17-49, the corresponding values were 0.82 and 1.27 A, respectively. AP-A adopts a compact structure consisting of four short strands of antiparallel beta-sheet (residues 2-4, 20-23, 34-37, and 45-48) connected by three loops. The first loop commences with a type I beta-turn which includes two important Asp residues; this loop is the least well-defined region of the protein, although a beta-turn involving residues 13-16 is observed in nearly half the structures. The loop linking the second and third strands is constrained by the 29-47 disulfide bond and contains two well-defined beta-turns, while the third loop contains the Gly40-Pro41 sequence, which has been identified previously as the site of cis-trans isomerism. The carboxylate group of Asp7 is close to the epsilon-ammonium group of Lys37, suggesting that they may form a salt bridge. A pH titration monitored by 2D NMR supports this by showing that Asp7 has a low pKa. It is proposed that this region of the molecule and the nearby residues Asp9 and His39 form part of the molecular surface which interacts with the mammalian cardiac sodium channel.


    Related Citations: 
    • Backbone Folding of the Polypeptide Cardiac Stimulant Anthopleurin-A Determined by Nuclear Magnetic Resonance, Distance Geometry and Molecular Dynamics
      Torda, A.E.,Mabbutt, B.C.,Van Gunsteren, W.F.,Norton, R.S.
      (1988) FEBS Lett. 239: 266
    • Amino Acid Sequence of the Anthopleura Xanthogrammica Heart Stimulant Anthopleurin-A
      Tanaka, M.,Haniu, M.,Yasunobu, M.,Norton, T.R.
      (1977) Biochemistry 16: 204
    • Structure and Structure-Function Relationships of Sea Anemone Proteins that Interact with the Sodium Channel
      Norton, R.S.
      (1991) Toxicon 29: 1051


    Organizational Affiliation

    NMR Laboratory, Biomolecular Research Institute, Parkville, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTHOPLEURIN-A
A
49Anthopleura xanthogrammicaN/A
Find proteins for P01530 (Anthopleura xanthogrammica)
Go to UniProtKB:  P01530
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
  • Olderado: 1AHL Olderado
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-11-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other