PDBsum entry 3m4v

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Oxidoreductase PDB id
Protein chains
451 a.a.
HEM ×2
Waters ×932
PDB id:
Name: Oxidoreductase
Title: Crystal structure of the a330p mutant of cytochrome p450 bm3
Structure: Bifunctional p-450/NADPH-p450 reductase. Chain: a, b. Fragment: heme domain, residues 1-482. Synonym: cytochrome p450(bm-3), cytochrome p450bm-3, cytoch 102. Engineered: yes. Mutation: yes
Source: Bacillus megaterium. Organism_taxid: 1404. Gene: p450bm-3. Expressed in: escherichia coli. Expression_system_taxid: 562.
1.90Å     R-factor:   0.189     R-free:   0.232
Authors: W.Yang,C.J.C.Whitehouse,S.G.Bell,M.Bartlam,L.L.Wong,Z.Rao
Key ref: C.J.Whitehouse et al. (2010). Structural basis for the properties of two single-site proline mutants of CYP102A1 (P450BM3). Chembiochem, 11, 2549-2556. PubMed id: 21110374
12-Mar-10     Release date:   23-Mar-11    
Go to PROCHECK summary

Protein chains
Pfam   ArchSchema ?
P14779  (CPXB_BACME) -  Bifunctional P-450/NADPH-P450 reductase
1049 a.a.
451 a.a.*
Key:    PfamA domain  Secondary structure  CATH domain
* PDB and UniProt seqs differ at 1 residue position (black cross)

 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  


Chembiochem 11:2549-2556 (2010)
PubMed id: 21110374  
Structural basis for the properties of two single-site proline mutants of CYP102A1 (P450BM3).
C.J.Whitehouse, W.Yang, J.A.Yorke, B.C.Rowlatt, A.J.Strong, C.F.Blanford, S.G.Bell, M.Bartlam, L.L.Wong, Z.Rao.
The crystal structures of the haem domains of Ala330Pro and Ile401Pro, two single-site proline variants of CYP102A1 (P450(BM3)) from Bacillus megaterium, have been solved. In the A330P structure, the active site is constricted by the relocation of the Pro329 side chain into the substrate access channel, providing a basis for the distinctive C-H bond oxidation profiles given by the variant and the enhanced activity with small molecules. I401P, which is exceptionally active towards non-natural substrates, displays a number of structural similarities to substrate-bound forms of the wild-type enzyme, notably an off-axial water ligand, a drop in the proximal loop, and the positioning of two I-helix residues, Gly265 and His266, the reorientation of which prevents the formation of several intrahelical hydrogen bonds. Second-generation I401P variants gave high in vitro oxidation rates with non-natural substrates as varied as fluorene and propane, towards which the wild-type enzyme is essentially inactive. The substrate-free I401P haem domain had a reduction potential slightly more oxidising than the palmitate-bound wild-type haem domain, and a first electron transfer rate that was about 10‚ÄČ% faster. The electronic properties of A330P were, by contrast, similar to those of the substrate-free wild-type enzyme.