3-Ketosteroid 9alpha-monooxygenase

3-ketosteroid 9alpha-monooxygenase (EC 1.14.13.142, KshAB, 3-ketosteroid 9alpha-hydroxylase) is an enzyme with systematic name androsta-1,4-diene-3,17-dione,NADH:oxygen oxidoreductase (9alpha-hydroxylating). This enzyme catalyses the following chemical reaction

androsta-1,4-diene-3,17-dione + NADH + H + O₂

\rightleftharpoons

9alpha-hydroxyandrosta-1,4-diene-3,17-dione + NAD + H₂O

3-Ketosteroid 9alpha-monooxygenase is involved in the cholesterol degradation in several bacterial pathogens.

References

Petrusma M, Dijkhuizen L, van der Geize R (August 2009). "Rhodococcus rhodochrous DSM 43269 3-ketosteroid 9alpha-hydroxylase, a two-component iron-sulfur-containing monooxygenase with subtle steroid substrate specificity". Applied and Environmental Microbiology. 75 (16): 5300–7. Bibcode:2009ApEnM..75.5300P. doi:10.1128/AEM.00066-09. PMC 2725467. PMID 19561185.
Capyk JK, D'Angelo I, Strynadka NC, Eltis LD (April 2009). "Characterization of 3-ketosteroid 9{alpha}-hydroxylase, a Rieske oxygenase in the cholesterol degradation pathway of Mycobacterium tuberculosis". The Journal of Biological Chemistry. 284 (15): 9937–46. doi:10.1074/jbc.M900719200. PMC 2665117. PMID 19234303.
Capyk JK, Casabon I, Gruninger R, Strynadka NC, Eltis LD (November 2011). "Activity of 3-ketosteroid 9α-hydroxylase (KshAB) indicates cholesterol side chain and ring degradation occur simultaneously in Mycobacterium tuberculosis". The Journal of Biological Chemistry. 286 (47): 40717–24. doi:10.1074/jbc.M111.289975. PMC 3220451. PMID 21987574.

External links

3-ketosteroid+9alpha-monooxygenase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

v t e Oxidoreductases: dioxygenases, including steroid hydroxylases (EC 1.14)
1.14.11: 2-oxoglutarate	Prolyl hydroxylase HIF prolyl-hydroxylase EGLN1 EGLN2 EGLN3 P4HTM Lysyl hydroxylase AlkB ALKBH1 FTO
1.14.13: NADH or NADPH	Flavin-containing monooxygenase FMO1 FMO2 FMO3 FMO4 FMO5 Nitric oxide synthase NOS1 NOS2 NOS3 Cholesterol 7 alpha-hydroxylase Methane monooxygenase 3A4 14α-demethylase 24-hydroxycholesterol 7α-hydroxylase
1.14.14: reduced flavin or flavoprotein	19A1 2D6 2E1
1.14.15: reduced iron–sulfur protein	11B1 11B2 11A1
1.14.16: reduced pteridine (BH4 dependent)	Phenylalanine hydroxylase Tyrosine hydroxylase Tryptophan hydroxylase
1.14.17: reduced ascorbate	Dopamine beta-hydroxylase
1.14.18-19: other	Tyrosinase Stearoyl-CoA desaturase-1
1.14.99 - miscellaneous	Cyclooxygenase Heme oxygenase (HMOX1) Squalene monooxygenase 17A1 21A2 Ecdysone 20-monooxygenase Deoxyhypusine monooxygenase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)

Portal:

Biology

Category:

EC 1.14.13