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Vitamin B12 import system permease protein BtuC Vitamin B12 import ATP-binding protein BtuD Vitamin B12 transporter BtuB Protein tonB Biopolymer transport protein exbB Biopolymer transport protein exbD Vitamin B12 transporter BtuB Protein tonB Biopolymer transport protein exbB Biopolymer transport protein exbD Bifunctional adenosylcobalamin biosynthesis protein cobU Nicotinate- nucleotide-- dimethylbenzimidazole phosphoribosyltransferase Cobalamin synthase Alpha-ribazole phosphatase Cob(I)yrinic acid a,c-diamide adenosyltransferase Bifunctional adenosylcobalamin biosynthesis protein cobU Cob(I)yrinic acid a,c-diamide adenosyltransferase Vitamin B12-binding protein Vitamin B12 import system permease protein BtuC Vitamin B12-binding protein Cobinamide Cobinamide Cyanocobalamin Cyanocobalamin Adenosyl cobinamide ATP ADP H+ adenosylcobinamide phosphate Dimethylbenzimidazole nicotinate β-D- ribonucleotide H+ Nicotinic acid N1-(5- Phospho-a-D- ribosyl)-5,6- dimethylbenzimidazole Adenosylcobinamide- GDP H+ GMP adenosylcobalamin 5'-phosphate H2O Pi coenzyme B12 Cobalamin ATP PPPi GTP H+ PPi Cobinamide ATP Triphosphate Cyanocobalamin ATP H2O ADP Pi H+ ATP H2O ADP Pi H+ Vitamin B12 import ATP-binding protein BtuD