EC 1.1.3.43     
Accepted name: paromamine 6′-oxidase
Reaction: paromamine + O2 = 6′-dehydroparomamine + H2O2
Other name(s): btrQ (gene name); neoG (gene name); kanI (gene name); tacB (gene name); neoQ (obsolete gene name)
Systematic name: paromamine:oxygen 6′-oxidoreductase
Comments: Contains FAD. Involved in the biosynthetic pathways of several clinically important aminocyclitol antibiotics, including kanamycin, butirosin, neomycin and ribostamycin. Works in combination with EC 2.6.1.93, neamine transaminase, to replace the 6′-hydroxy group of paromamine with an amino group. The enzyme from the bacterium Streptomyces fradiae also catalyses EC 1.1.3.44, 6′′′-hydroxyneomycin C oxidase.
References:
1.  Huang, F., Spiteller, D., Koorbanally, N.A., Li, Y., Llewellyn, N.M. and Spencer, J.B. Elaboration of neosamine rings in the biosynthesis of neomycin and butirosin. ChemBioChem 8 (2007) 283–288. [PMID: 17206729]
2.  Yu, Y., Hou, X., Ni, X. and Xia, H. Biosynthesis of 3′-deoxy-carbamoylkanamycin C in a Streptomyces tenebrarius mutant strain by tacB gene disruption. J. Antibiot. (Tokyo) 61 (2008) 63–69. [PMID: 18408324]
3.  Clausnitzer, D., Piepersberg, W. and Wehmeier, U.F. The oxidoreductases LivQ and NeoQ are responsible for the different 6′-modifications in the aminoglycosides lividomycin and neomycin. J. Appl. Microbiol. 111 (2011) 642–651. [PMID: 21689223]
[EC 1.1.3.43 created 2012]
 
 
EC 2.3.1.59     
Accepted name: gentamicin 2′-N-acetyltransferase
Reaction: acetyl-CoA + gentamicin C1a = CoA + N2′-acetylgentamicin C1a
Glossary: kanamycin
Other name(s): gentamycin acetyltransferase II; gentamycin 2′-N-acetyltransferase; acetyl-CoA:gentamycin-C1a N2′-acetyltransferase
Systematic name: acetyl-CoA:gentamicin-C1a N2′-acetyltransferase
Comments: The antibiotics gentamicin A, sisomicin, tobramycin, paromomycin, neomycin B, kanamycin B and kanamycin C can also act as acceptors.
References:
1.  Benveniste, R. and Davies, J. Aminoglycoside antibiotic-inactivating enzymes in actinomycetes similar to those present in clinical isolates of antibiotic-resistant bacteria. Proc. Natl. Acad. Sci. USA 70 (1973) 2276–2280. [PMID: 4209515]
[EC 2.3.1.59 created 1976]
 
 
EC 2.4.1.284     
Accepted name: 2-deoxystreptamine glucosyltransferase
Reaction: UDP-α-D-glucose + 2-deoxystreptamine = UDP + 2′-deamino-2′-hydroxyparomamine
Glossary: 2′-deamino-2′-hydroxyparomamine = 4-O-α-D-glucopyranosyl-2-deoxy-D-streptamine
Other name(s): kanF (gene name)
Systematic name: UDP-α-D-glucose:2-deoxystreptamine 6-α-D-glucosyltransferase
Comments: Involved in the biosynthesis of kanamycin B and kanamycin C. Also catalyses EC 2.4.1.283, 2-deoxystreptamine N-acetyl-D-glucosaminyltransferase, but activity is only one fifth of that with UDP-α-D-glucose.
References:
1.  Park, J.W., Park, S.R., Nepal, K.K., Han, A.R., Ban, Y.H., Yoo, Y.J., Kim, E.J., Kim, E.M., Kim, D., Sohng, J.K. and Yoon, Y.J. Discovery of parallel pathways of kanamycin biosynthesis allows antibiotic manipulation. Nat. Chem. Biol. 7 (2011) 843–852. [PMID: 21983602]
[EC 2.4.1.284 created 2012]
 
 
EC 2.4.1.301     
Accepted name: 2′-deamino-2′-hydroxyneamine 1-α-D-kanosaminyltransferase
Reaction: (1) UDP-α-D-kanosamine + 2′-deamino-2′-hydroxyneamine = UDP + kanamycin A
(2) UDP-α-D-kanosamine + neamine = UDP + kanamycin B
(3) UDP-α-D-kanosamine + paromamine = UDP + kanamycin C
(4) UDP-α-D-kanosamine + 2′-deamino-2′-hydroxyparomamine = UDP + kanamycin X
Glossary: neamine = (1R,2R,3S,4R,6S)-4,6-diamino-2,3-dihydroxycyclohexyl 2,6-diamino-2,6-dideoxy-α-D-glucopyranoside
paromamine = (1R,2R,3S,4R,6S)-4,6-diamino-2,3-dihydroxycyclohexyl 2-amino-2-deoxy-α-D-glucopyranoside
UDP-α-D-kanosamine = uridine 5′-[3-(3-amino-3-deoxy-α-D-glucopyranosyl) diphosphate]
kanamycin A = (1S,2R,3R,4S,6R)-4,6-diamino-3-(6-amino-6-deoxy-α-D-glucopyranosyloxy)-2-hydroxycyclohexyl 3-amino-3-deoxy-α-D-glucopyranoside
kanamycin B = (1R,2S,3S,4R,6S)-4,6-diamino-3-(3-amino-3-deoxy-α-D-glucopyranosyloxy)-2-hydroxycyclohexyl 2,6-diamino-2,6-dideoxy-α-D-glucopyranoside
kanamycin C = (1R,2S,3S,4R,6S)-4,6-diamino-3-(3-amino-3-deoxy-α-D-glucopyranosyloxy)-2-hydroxycyclohexyl 2-amino-2-deoxy-α-D-glucopyranoside
kanamycin X = (1S,2R,3R,4S,6R)-4,6-diamino-3-(α-D-glucopyranosyloxy)-2-hydroxycyclohexyl 3-amino-3-deoxy-α-D-glucopyranoside
Other name(s): kanE (gene name); kanM2 (gene name)
Systematic name: UDP-α-D-kanosamine:2′-deamino-2′-hydroxyneamine 1-α-D-kanosaminyltransferase
Comments: Involved in the biosynthetic pathway of kanamycins. The enzyme characterized from the bacterium Streptomyces kanamyceticus can also accept UDP-α-D-glucose with lower efficiency [2].
References:
1.  Kudo, F., Sucipto, H. and Eguchi, T. Enzymatic activity of a glycosyltransferase KanM2 encoded in the kanamycin biosynthetic gene cluster. J. Antibiot. (Tokyo) 62 (2009) 707–710. [PMID: 19911031]
2.  Park, J.W., Park, S.R., Nepal, K.K., Han, A.R., Ban, Y.H., Yoo, Y.J., Kim, E.J., Kim, E.M., Kim, D., Sohng, J.K. and Yoon, Y.J. Discovery of parallel pathways of kanamycin biosynthesis allows antibiotic manipulation. Nat. Chem. Biol. 7 (2011) 843–852. [PMID: 21983602]
[EC 2.4.1.301 created 2013]