Vitamin B12 and protoheme metabolism

Reaction: 
pc1[c] + amet[c] -> pc2[c] + ahcys[c]
Metabolites: 
Reaction: 
c1ala[c] + atp[c] -> coB12[c] + pppi[c]
Metabolites: 
Reaction: 
pc2[c] + nad[c] -> shclin[c] + nadh[c] + h[c]
Metabolites: 
Reaction: 
cbprc6a[c] + nadh[c] + h[c] <=> cbdhpcr6[c] + nad[c]