PDBsum entry 4o4p

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Oxidoreductase/oxidoreductase inhibitor PDB id
Protein chains
450 a.a.
HEM ×2
1C6 ×2
Waters ×569
PDB id:
Name: Oxidoreductase/oxidoreductase inhibitor
Title: Structure of p450 bm3 a82f f87v in complex with s-omeprazol
Structure: Bifunctional p-450/NADPH-p450 reductase. Chain: a, b. Fragment: bm3 heme domain. Synonym: cytochrome p450(bm-3), cytochrome p450bm-3, cytoch 102, NADPH--cytochrome p450 reductase. Engineered: yes. Mutation: yes
Source: Bacillus megaterium. Organism_taxid: 1404. Gene: cyp102a1, cyp102. Expressed in: escherichia coli. Expression_system_taxid: 562
1.83Å     R-factor:   0.188     R-free:   0.221
Authors: D.Leys
Key ref: C.F.Butler et al. (2014). Human P450-like oxidation of diverse proton pump inhibitor drugs by 'gatekeeper' mutants of flavocytochrome P450 BM3. Biochem J, 460, 247-259. PubMed id: 24588219 DOI: 10.1042/BJ20140030
19-Dec-13     Release date:   29-Jan-14    
Go to PROCHECK summary

Protein chains
Pfam   ArchSchema ?
P14779  (CPXB_BACME) -  Bifunctional P-450/NADPH-P450 reductase
1049 a.a.
450 a.a.*
Key:    PfamA domain  Secondary structure  CATH domain
* PDB and UniProt seqs differ at 2 residue positions (black crosses)

 Enzyme reactions 
   Enzyme class 2: E.C.  - Unspecific monooxygenase.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]
      Reaction: RH + reduced flavoprotein + O2 = ROH + oxidized flavoprotein + H2O
+ reduced flavoprotein
+ O(2)
+ oxidized flavoprotein
+ H(2)O
      Cofactor: Heme-thiolate
   Enzyme class 3: E.C.  - NADPH--hemoprotein reductase.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]
      Reaction: NADPH + n oxidized hemoprotein = NADP+ + n reduced hemoprotein
+ n oxidized hemoprotein
= NADP(+)
+ n reduced hemoprotein
      Cofactor: FAD; FMN
Note, where more than one E.C. class is given (as above), each may correspond to a different protein domain or, in the case of polyprotein precursors, to a different mature protein.
Molecule diagrams generated from .mol files obtained from the KEGG ftp site
 Gene Ontology (GO) functional annotation 
  GO annot!
  Biological process     oxidation-reduction process   1 term 
  Biochemical function     oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen     3 terms  


DOI no: 10.1042/BJ20140030 Biochem J 460:247-259 (2014)
PubMed id: 24588219  
Human P450-like oxidation of diverse proton pump inhibitor drugs by 'gatekeeper' mutants of flavocytochrome P450 BM3.
C.F.Butler, C.Peet, K.J.McLean, M.T.Baynham, R.T.Blankley, K.Fisher, S.E.Rigby, D.Leys, M.W.Voice, A.W.Munro.
Production of drug metabolites is one area where enzymatic conversion has significant advantages over synthetic chemistry. These high value products are complex to synthesize, but are increasingly important in drug safety testing. The vast majority of drugs are metabolized by cytochromes P450 (P450s), with oxidative transformations usually being highly regio- and stereo-selective. The PPIs (proton pump inhibitors) are drugs that are extensively metabolized by human P450s, producing diverse metabolites dependent on the specific substrate. In the present paper we show that single mutations (A82F and F87V) in the biotechnologically important Bacillus megaterium P450 BM3 enzyme cause major alterations in its substrate selectivity such that a set of PPI molecules become good substrates in these point mutants and in the F87V/A82F double mutant. The substrate specificity switch is analysed by drug binding, enzyme kinetics and organic product analysis to confirm new activities, and X-ray crystallography provides a structural basis for the binding of esomeprazole to the F87V/A82F enzyme. These studies confirm that such 'gatekeeper' mutations in P450 BM3 produce major perturbations to its conformation and substrate selectivity, enabling novel P450 BM3 reactions typical of those performed by human P450s. Efficient transformation of several PPI drugs to human-like products by BM3 variants provides new routes to production of these metabolites.