The Enzyme Database

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EC 4.3.99.3     
Accepted name: 7-carboxy-7-deazaguanine synthase
Reaction: 6-carboxy-5,6,7,8-tetrahydropterin = 7-carboxy-7-carbaguanine + NH3
For diagram of queuine biosynthesis, click here
Glossary: 7-carboxy-7-carbaguanine = 7-carboxy-7-deazaguanine
Other name(s): 7-carboxy-7-carbaguanine synthase; queE (gene name)
Systematic name: 6-carboxy-5,6,7,8-tetrahydropterin ammonia-lyase
Comments: Requires Mg2+. The enzyme is a member of the superfamily of S-adenosyl-L-methionine-dependent radical (radical AdoMet) enzymes. Binds a [4Fe-4S] cluster that is coordinated by 3 cysteines and an exchangeable S-adenosyl-L-methionine molecule. The S-adenosyl-L-methionine is catalytic as it is regenerated at the end of the reaction. The reaction is part of the biosynthesis pathway of queuosine.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  McCarty, R.M., Somogyi, A., Lin, G., Jacobsen, N.E. and Bandarian, V. The deazapurine biosynthetic pathway revealed: in vitro enzymatic synthesis of preQ0 from guanosine 5′-triphosphate in four steps. Biochemistry 48 (2009) 3847–3852. [DOI] [PMID: 19354300]
2.  McCarty, R.M., Krebs, C. and Bandarian, V. Spectroscopic, steady-state kinetic, and mechanistic characterization of the radical SAM enzyme QueE, which catalyzes a complex cyclization reaction in the biosynthesis of 7-deazapurines. Biochemistry 52 (2013) 188–198. [DOI] [PMID: 23194065]
[EC 4.3.99.3 created 2012]
 
 
EC 6.3.4.20     
Accepted name: 7-cyano-7-deazaguanine synthase
Reaction: 7-carboxy-7-carbaguanine + NH3 + ATP = 7-cyano-7-carbaguanine + ADP + phosphate + H2O
For diagram of queuine biosynthesis, click here
Glossary: preQ0 = 7-cyano-7-carbaguanine = 7-cyano-7-deazaguanine
7-carboxy-7-carbaguanine = 7-carboxy-7-deazaguanine
Other name(s): preQ0 synthase; 7-cyano-7-carbaguanine synthase; queC (gene name)
Systematic name: 7-carboxy-7-carbaguanine:ammonia ligase (ADP-forming)
Comments: Binds Zn2+. The reaction is part of the biosynthesis pathway of queuosine.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  McCarty, R.M., Somogyi, A., Lin, G., Jacobsen, N.E. and Bandarian, V. The deazapurine biosynthetic pathway revealed: in vitro enzymatic synthesis of preQ0 from guanosine 5′-triphosphate in four steps. Biochemistry 48 (2009) 3847–3852. [DOI] [PMID: 19354300]
2.  Cicmil, N. and Huang, R.H. Crystal structure of QueC from Bacillus subtilis: an enzyme involved in preQ1 biosynthesis. Proteins 72 (2008) 1084–1088. [DOI] [PMID: 18491386]
[EC 6.3.4.20 created 2012]
 
 


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