5-formyltetrahydrofolate cyclo-ligase: a (6S)-5-formyltetrahydrofolate + ATP→a 5,10-methenyltetrahydrofolate + ADP + phosphate  (EC 6.3.3.2) | 
 | GFF85 | 
 Dihydrofolate reductase (in reverse): a 7,8-dihydrofolate + NADPH + H+→a tetrahydrofolate + NADP+  (EC 1.5.1.3) | 
 | GFF3573 | 
 | a tetrahydrofolate + glycine + NAD+→a 5,10-methylenetetrahydrofolate + ammonium + CO2 + NADH  (EC 1.4.1.27) | 
 | GFF4404 | 
 Glycine hydroxymethyltransferase (in reverse): a 5,10-methylenetetrahydrofolate + glycine + H2O→a tetrahydrofolate + L-serine  (EC 2.1.2.1) | 
 | GFF3431 | 
 | GFF575 | 
 Methionine synthase: a 5-methyltetrahydrofolate + L-homocysteine→a tetrahydrofolate + L-methionine  (EC 2.1.1.13) | 
 | GFF4146 | 
 Methylenetetrahydrofolate dehydrogenase (NADP(+)): a 5,10-methylenetetrahydrofolate + NADP+→a 5,10-methenyltetrahydrofolate + NADPH  (EC 1.5.1.5) | 
 | GFF1063 | 
 | a 5,10-methylenetetrahydrofolate + NADH + H+→a 5-methyltetrahydrofolate + NAD+  (EC 1.5.1.54) | 
 | GFF4147 | 
 Thymidylate synthase: a 5,10-methylenetetrahydrofolate + dUMP→a 7,8-dihydrofolate + dTMP  (EC 2.1.1.45) | 
 | GFF254 | 
 Methenyltetrahydrofolate cyclohydrolase: a 5,10-methenyltetrahydrofolate + H2O→an N10-formyltetrahydrofolate + H+  (EC 3.5.4.9) | 
 | GFF1063 | 
 | GFF2376 | 
Links:
Candidate genes for each reaction are identified from best hits to MetaCyc; by matching EC numbers (which are assigned by TIGRFam, SEED, or best hits to KEGG); or by matching SEED roles to KEGG reactions to MetaCyc reactions. See the "Protein" tab of each gene for more information