Choline oxidase

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Choline oxidase
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Choline oxidase dimer, Arthrobacter globiformis
Identifiers
EC no. 1.1.3.17
CAS no. 9028-67-5
Databases
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MetaCyc metabolic pathway
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NCBI proteins

In enzymology, choline oxidase (EC 1.1.3.17) is an enzyme that catalyzes two consecutive chemical reactions

 
O2
H2O2
Choline oxidase
O2
H2O2
 
 
O2
H2O2
Choline oxidase
O2
H2O2
 

The two substrates of this enzyme are choline and oxygen. The first reaction gives betaine aldehyde and hydrogen peroxide. The aldehyde intermediate is then further oxidised to trimethylglycine. [1] [2]

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with oxygen as acceptor. The systematic name of this enzyme class is choline:oxygen 1-oxidoreductase. This enzyme participates in glycine, serine, and threonine metabolism. It employs one cofactor, FAD. [3] [4] [5] [6]

References

  1. Enzyme 1.1.3.17 at KEGG Pathway Database.
  2. Takabe T; Tanaka, Y; Aoki, K; Hibino, T; Jikuya, H; Takano, J; Takabe, T; Takabe, T (2003). "Isolation and functional characterization of N-methyltransferases that catalyze betaine synthesis from glycine in a halotolerant photosynthetic organism Aphanothece halophytica". J. Biol. Chem. 278 (7): 4932–42. doi: 10.1074/jbc.M210970200 . PMID   12466265.
  3. Rozwadowski KL, Khachatourians GG, Selvaraj G (1991). "Choline oxidase, a catabolic enzyme in Arthrobacter pascens, facilitates adaptation to osmotic stress in Escherichia coli". J. Bacteriol. 173 (2): 472–8. doi:10.1128/jb.173.2.472-478.1991. PMC   207035 . PMID   1987142.
  4. Rand T, Halkier T, Hansen OC (2003). "Structural characterization and mapping of the covalently linked FAD cofactor in choline oxidase from Arthrobacter globiformis". Biochemistry. 42 (23): 7188–94. doi:10.1021/bi0274266. PMID   12795615.
  5. Gadda G, Powell NL, Menon P (2004). "The trimethylammonium headgroup of choline is a major determinant for substrate binding and specificity in choline oxidase". Arch. Biochem. Biophys. 430 (2): 264–73. doi:10.1016/j.abb.2004.07.011. PMID   15369826.
  6. Fan F, Gadda G (2005). "On the catalytic mechanism of choline oxidase". J. Am. Chem. Soc. 127 (7): 2067–74. Bibcode:2005JAChS.127.2067F. doi:10.1021/ja044541q. PMID   15713082.