MetaCyc Pathway: superpathway of L-methionine biosynthesis (transsulfuration) in Escherichia coli BW25113

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Reactions and Genes Putrescine (N)
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Aspartate transaminase (in reverse):
oxaloacetate + L-glutamate→L-aspartate + 2-oxoglutarate (EC 2.6.1.1)
b0928 (aspC) -2.9
b4340 (yjiR) +0.1
Aspartate kinase:
L-aspartate + ATP→L-aspartyl-4-phosphate + ADP (EC 2.7.2.4)
b0002 (thrA) -4.6
b3940 (metL) -1.0
b4024 (lysC) +1.3
Aspartate-semialdehyde dehydrogenase (in reverse):
L-aspartyl-4-phosphate + NADPH + H+→L-aspartate 4-semialdehyde + NADP+ + phosphate (EC 1.2.1.11)
b2319 (usg) -0.3
b3433 (asd) N.D.
Homoserine dehydrogenase (in reverse):
L-aspartate 4-semialdehyde + NAD(P)H + H+→L-homoserine + NAD(P)+ (EC 1.1.1.3)
b0002 (thrA) -4.6
b3940 (metL) -1.0
Homoserine O-succinyltransferase:
L-homoserine + succinyl-CoA→O-succinyl-L-homoserine + coenzyme A (EC 2.3.1.46)
b4013 (metA) -2.6
Cystathionine gamma-synthase:
O-succinyl-L-homoserine + L-cysteine→L-cystathionine + H+ + succinate (EC 2.5.1.48)
b3939 (metB) -4.6
Cysteine-S-conjugate beta-lyase:
L-cystathionine + H2O→L-homocysteine + ammonium + pyruvate (EC 4.4.1.13)
b1622 (malY) -0.0
b3008 (metC) -4.8
5-methyltetrahydropteroyltriglutamate--homocysteine S-methyltransferase:
L-homocysteine + 5-methyltetrahydropteroyl tri-L-glutamate→L-methionine + tetrahydropteroyl tri-L-glutamate (EC 2.1.1.14)
b3829 (metE) -4.2
Methionine synthase:
L-homocysteine + a 5-methyltetrahydrofolate→L-methionine + a tetrahydrofolate (EC 2.1.1.13)
b4019 (metH) -0.1

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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