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EC 2.8.1.6 Details
EC number
2.8.1.6
Accepted name
biotin synthase
Reaction
dethiobiotin + sulfur-(sulfur carrier) + 2 S-adenosyl-L-methionine + 2 reduced [2Fe-2S] ferredoxin = biotin + (sulfur carrier) + 2 L-methionine + 2 5′-deoxyadenosine + 2 oxidized [2Fe-2S] ferredoxin
Other name(s)
dethiobiotin:sulfur sulfurtransferase
Systematic name
dethiobiotin:sulfur-(sulfur carrier) sulfurtransferase
CAS registry number
80146-93-6
Comment
The enzyme binds a [4Fe-4S] and a [2Fe-2S] cluster. In every reaction cycle, the enzyme consumes two molecules of AdoMet. The first reaction produces 5′-deoxyadenosine and 4,5-secobiotin. Reaction with another equivalent of AdoMet results in abstraction of the C-6 methylene pro-S hydrogen atom from 4,5-secobiotin, and the resulting carbon radical is quenched via formation of an intramolecular C-S bond, thus closing the biotin tetrahydrothiophene ring. The sulfur donor is believed to be the [2Fe-2S] cluster, which is sacrificed in the process, so that in vitro the reaction is a single turnover. In vivo, the [2Fe-2S] cluster can be reassembled by the Isc or Suf iron-sulfur cluster assembly systems, to allow further catalysis.
History
created 1999, modified 2006, modified 2011, modified 2014
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EC Tree
1 Oxidoreductases
2 Transferases
2.1 Transferring one-carbon groups
2.2 Transferring aldehyde or ketonic groups
2.3 Acyltransferases
2.4 Glycosyltransferases
2.5 Transferring alkyl or aryl groups, other than methyl groups
2.6 Transferring nitrogenous groups
2.7 Transferring phosphorus-containing groups
2.8 Transferring sulfur-containing groups
2.8.1 Sulfurtransferases
2.8.2 Sulfotransferases
2.8.2.1 aryl sulfotransferase
2.8.2.2 alcohol sulfotransferase
2.8.2.3 amine sulfotransferase
2.8.2.4 estrone sulfotransferase
2.8.2.5 chondroitin 4-sulfotransferase
2.8.2.6 choline sulfotransferase
2.8.2.7 UDP-N-acetylgalactosamine-4-sulfate sulfotransferase
2.8.2.8 [heparan sulfate]-glucosamine N-sulfotransferase
2.8.2.9 tyrosine-ester sulfotransferase
2.8.2.10 Renilla-luciferin sulfotransferase
2.8.2.11 galactosylceramide sulfotransferase
2.8.2.12 created 1972, deleted 2001
2.8.2.13 psychosine sulfotransferase
2.8.2.14 bile-salt sulfotransferase
2.8.2.15 steroid sulfotransferase
2.8.2.16 thiol sulfotransferase
2.8.2.17 chondroitin 6-sulfotransferase
2.8.2.18 cortisol sulfotransferase
2.8.2.19 triglucosylalkylacylglycerol sulfotransferase
2.8.2.20 protein-tyrosine sulfotransferase
2.8.2.21 keratan sulfotransferase
2.8.2.22 aryl-sulfate sulfotransferase
2.8.2.23 [heparan sulfate]-glucosamine 3-sulfotransferase 1
2.8.2.24 aromatic desulfoglucosinolate sulfotransferase
2.8.2.25 flavonol 3-sulfotransferase
2.8.2.26 quercetin-3-sulfate 3′-sulfotransferase
2.8.2.27 quercetin-3-sulfate 4′-sulfotransferase
2.8.2.28 quercetin-3,3′-bissulfate 7-sulfotransferase
2.8.2.29 [heparan sulfate]-glucosamine 3-sulfotransferase 2
2.8.2.30 [heparan sulfate]-glucosamine 3-sulfotransferase 3
2.8.2.31 petromyzonol sulfotransferase
2.8.2.32 scymnol sulfotransferase
2.8.2.33 N-acetylgalactosamine 4-sulfate 6-O-sulfotransferase
2.8.2.34 glycochenodeoxycholate sulfotransferase
2.8.2.35 dermatan 4-sulfotransferase
2.8.2.36 desulfo-A47934 sulfotransferase
2.8.2.37 trehalose 2-sulfotransferase
2.8.2.38 aliphatic desulfoglucosinolate sulfotransferase
2.8.2.39 hydroxyjasmonate sulfotransferase
2.8.2.40 ω-hydroxy-β-dihydromenaquinone-9 sulfotransferase
2.8.3 CoA-transferases
2.8.3.1 propionate CoA-transferase
2.8.3.2 oxalate CoA-transferase
2.8.3.3 malonate CoA-transferase
2.8.3.4 created 1961, deleted 1964
2.8.3.5 3-oxoacid CoA-transferase
2.8.3.6 3-oxoadipate CoA-transferase
2.8.3.7 succinate—citramalate CoA-transferase
2.8.3.8 acetate CoA-transferase
2.8.3.9 butyrate—acetoacetate CoA-transferase
2.8.3.10 citrate CoA-transferase
2.8.3.11 citramalate CoA-transferase
2.8.3.12 glutaconate CoA-transferase
2.8.3.13 succinate—hydroxymethylglutarate CoA-transferase
2.8.3.14 5-hydroxypentanoate CoA-transferase
2.8.3.15 succinyl-CoA:(R)-benzylsuccinate CoA-transferase
2.8.3.16 formyl-CoA transferase
2.8.3.17 3-(aryl)acryloyl-CoA:(R)-3-(aryl)lactate CoA-transferase
2.8.3.18 succinyl-CoA:acetate CoA-transferase
2.8.3.19 CoA:oxalate CoA-transferase
2.8.3.20 succinyl-CoA—D-citramalate CoA-transferase
2.8.3.21 L-carnitine CoA-transferase
2.8.3.22 succinyl-CoA—L-malate CoA-transferase
2.8.3.23 caffeate CoA-transferase
2.8.3.24 (R)-2-hydroxy-4-methylpentanoate CoA-transferase
2.8.3.25 bile acid CoA-transferase
2.8.3.26 succinyl-CoA:mesaconate CoA transferase
2.8.3.27 propanoyl-CoA:succinate CoA transferase
2.8.3.28 phenylsuccinyl-CoA transferase
2.8.4 Transferring alkylthio groups
2.8.5 Thiosulfotransferases
2.9 Transferring selenium-containing groups
2.10 Transferring molybdenum- or tungsten-containing groups
3 Hydrolases
4 Lyases
5 Isomerases
6 Ligases
7 Translocases