PDBsum entry 4em4

Oxidoreductase/oxidoreductase inhibitor

PDB id: 4em4

Contents

Protein chains

437 a.a.

Ligands

FAD ×2

CA8 ×2

Metals

_MG ×3

_CL ×7

Waters ×1080

PDB id:

4em4

Name:

Oxidoreductase/oxidoreductase inhibitor

Title:

Crystal structure of staphylococcus aureus bound with the covalent inhibitor pethyl-vs-coa

Structure:

Coenzyme a disulfide reductase. Chain: a, b. Synonym: coa-disulfide reductase, coadr. Engineered: yes

Source:

Staphylococcus aureus subsp. Aureus. Organism_taxid: 367830. Strain: usa300. Gene: cdr, sausa300_0873. Expressed in: escherichia coli. Expression_system_taxid: 562.

Resolution:

1.82Å R-factor: 0.156 R-free: 0.202

Authors:

B.D.Wallace,J.S.Edwards,A.Claiborne,M.R.Redinbo

Key ref:

B.D.Wallace et al. (2012). Turnover-dependent covalent inactivation of Staphylococcus aureus coenzyme A-disulfide reductase by coenzyme A-mimetics: mechanistic and structural insights. Biochemistry, 51, 7699-7711. PubMed id: 22954034

Date:

11-Apr-12 Release date: 17-Oct-12

Protein chains

Q2FIA5  (CDR_STAA3) -  Coenzyme A disulfide reductase from Staphylococcus aureus (strain USA300)

Seq: 438 a.a.

Struc: 437 a.a.

Enzyme reactions

• Enzyme class: E.C.1.8.1.14 - CoA-disulfide reductase.
• Reaction: NADP⁺ + 2 CoA = CoA-disulfide + NADPH + H⁺

NADP(+) (Bound ligand (Het Group name = CA8) matches with 79.66% similarity) + 2 × CoA = CoA-disulfide + NADPH + H(+)

• Cofactor: FAD

FAD (Bound ligand (Het Group name = FAD) corresponds exactly)

Molecule diagrams generated from .mol files obtained from the KEGG ftp site

reference

Biochemistry 51:7699-7711 (2012)

PubMed id: 22954034

Turnover-dependent covalent inactivation of Staphylococcus aureus coenzyme A-disulfide reductase by coenzyme A-mimetics: mechanistic and structural insights.

B.D.Wallace, J.S.Edwards, J.R.Wallen, W.J.Moolman, R.van der Westhuyzen, E.Strauss, M.R.Redinbo, A.Claiborne.

ABSTRACT

Disruption of the unusual thiol-based redox homeostasis mechanisms in Staphylococcus aureus represents a unique opportunity to identify new metabolic processes and new targets for intervention. Targeting uncommon aspects of CoASH biosynthetic and redox functions in S. aureus, the antibiotic CJ-15,801 has recently been demonstrated to be an antimetabolite of the CoASH biosynthetic pathway in this organism; CoAS-mimetics containing α,β-unsaturated sulfone and carboxyl moieties have also been exploited as irreversible inhibitors of S. aureus coenzyme A-disulfide reductase (SaCoADR). In this work we have determined the crystal structures of three of these covalent SaCoADR-inhibitor complexes, prepared by inactivation of wild-type enzyme during turnover. The structures reveal the covalent linkage between the active-site Cys43-S(γ) and C(β) of the vinyl sulfone or carboxyl moiety. The full occupancy of two inhibitor molecules per enzyme dimer, together with kinetic analyses of the wild-type/C43S heterodimer, indicates that half-sites-reactivity is not a factor during normal catalytic turnover. Further, we provide the structures of SaCoADR active-site mutants; in particular, Tyr419'-OH plays dramatic roles in directing intramolecular reduction of the Cys43-SSCoA redox center, in the redox asymmetry observed for the two FAD per dimer in NADPH titrations, and in catalysis. The two conformations observed for the Ser43 side chain in the C43S mutant structure lend support to a conformational switch for Cys43-S(γ) during its catalytic Cys43-SSCoA/Cys43-SH redox cycle. Finally, the structures of the three inhibitor complexes provide a framework for design of more effective inhibitors with therapeutic potential against several major bacterial pathogens.