4DG9 image
Entry Detail
PDB ID:
4DG9
Title:
Structure of holo-PA1221, an NRPS protein containing adenylation and PCP domains bound to vinylsulfonamide inhibitor
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-01-25
Release Date:
2012-05-02
Method Details:
Experimental Method:
Resolution:
2.55 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:PA1221
Chain IDs:A
Chain Length:620
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa
Ligand Molecules
Primary Citation
Structure of PA1221, a Nonribosomal Peptide Synthetase Containing Adenylation and Peptidyl Carrier Protein Domains.
Biochemistry 51 3252 3263 (2012)
PMID: 22452656 DOI: 10.1021/bi300112e

Abstact

Many bacteria use large modular enzymes for the synthesis of polyketide and peptide natural products. These multidomain enzymes contain integrated carrier domains that deliver bound substrates to multiple catalytic domains, requiring coordination of these chemical steps. Nonribosomal peptide synthetases (NRPSs) load amino acids onto carrier domains through the activity of an upstream adenylation domain. Our lab recently determined the structure of an engineered two-domain NRPS containing fused adenylation and carrier domains. This structure adopted a domain-swapped dimer that illustrated the interface between these two domains. To continue our investigation, we now examine PA1221, a natural two-domain protein from Pseudomonas aeruginosa. We have determined the amino acid specificity of this new enzyme and used domain specific mutations to demonstrate that loading the downstream carrier domain within a single protein molecule occurs more quickly than loading of a nonfused carrier domain intermolecularly. Finally, we have determined crystal structures of both apo- and holo-PA1221 proteins, the latter using a valine-adenosine vinylsulfonamide inhibitor that traps the adenylation domain-carrier domain interaction. The protein adopts an interface similar to that seen with the prior adenylation domain-carrier protein construct. A comparison of these structures with previous structures of multidomain NRPSs suggests that a large conformational change within the NRPS adenylation domains guides the carrier domain into the active site for thioester formation.

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Primary Citation of related structures