1AMU

PHENYLALANINE ACTIVATING DOMAIN OF GRAMICIDIN SYNTHETASE 1 IN A COMPLEX WITH AMP AND PHENYLALANINE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis for the activation of phenylalanine in the non-ribosomal biosynthesis of gramicidin S.

Conti, E.Stachelhaus, T.Marahiel, M.A.Brick, P.

(1997) EMBO J 16: 4174-4183

  • DOI: 10.1093/emboj/16.14.4174
  • Primary Citation of Related Structures:  
    1AMU

  • PubMed Abstract: 
  • The non-ribosomal synthesis of the cyclic peptide antibiotic gramicidin S is accomplished by two large multifunctional enzymes, the peptide synthetases 1 and 2. The enzyme complex contains five conserved subunits of approximately 60 kDa which carry out ATP-dependent activation of specific amino acids and share extensive regions of sequence similarity with adenylating enzymes such as firefly luciferases and acyl-CoA ligases ...

    The non-ribosomal synthesis of the cyclic peptide antibiotic gramicidin S is accomplished by two large multifunctional enzymes, the peptide synthetases 1 and 2. The enzyme complex contains five conserved subunits of approximately 60 kDa which carry out ATP-dependent activation of specific amino acids and share extensive regions of sequence similarity with adenylating enzymes such as firefly luciferases and acyl-CoA ligases. We have determined the crystal structure of the N-terminal adenylation subunit in a complex with AMP and L-phenylalanine to 1.9 A resolution. The 556 amino acid residue fragment is folded into two domains with the active site situated at their interface. Each domain of the enzyme has a similar topology to the corresponding domain of unliganded firefly luciferase, but a remarkable relative domain rotation of 94 degrees occurs. This conformation places the absolutely conserved Lys517 in a position to form electrostatic interactions with both ligands. The AMP is bound with the phosphate moiety interacting with Lys517 and the hydroxyl groups of the ribose forming hydrogen bonds with Asp413. The phenylalanine substrate binds in a hydrophobic pocket with the carboxylate group interacting with Lys517 and the alpha-amino group with Asp235. The structure reveals the role of the invariant residues within the superfamily of adenylate-forming enzymes and indicates a conserved mechanism of nucleotide binding and substrate activation.


    Related Citations: 
    • Modular Structure of Peptide Synthetases Revealed by Dissection of the Multifunctional Enzyme Grsa
      Stachelhaus, T., Marahiel, M.A.
      (1995) J Biol Chem 270: 6163

    Organizational Affiliation

    Blackett Laboratory, Imperial College, London, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GRAMICIDIN SYNTHETASE 1A, B563Brevibacillus brevisMutation(s): 0 
Gene Names: grsA
EC: 5.1.1.11
UniProt
Find proteins for P0C061 (Aneurinibacillus migulanus)
Explore P0C061 
Go to UniProtKB:  P0C061
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.68α = 90
b = 154.77β = 93.91
c = 65.3γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data reduction
X-PLORmodel building
X-PLORrefinement
CCP4data scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-07-01
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance