- androsterone dehydrogenase (B-specific) activity
Catalysis of the reaction: NAD(P)+ + androsterone = NAD(P)H + H+ + 5-alpha-androstane-3,17-dione. The reaction is B-specific (i.e. the pro-S hydrogen is transferred from the 4-position of reduced nicotinamide cofactor) with respect to NAD(P)+.
- P-TEFb-cap methyltransferase complex
A protein complex that is formed by the association of positive transcription elongation factor complex b (P-TEFb) with the mRNA capping methyltransferase.
- heme B metabolic process
The chemical reactions and pathways involving heme b, a Fe(II) porphyrin complex readily isolated from the hemoglobin of beef blood, but also found in other proteins including other hemoglobins, myoglobins, cytochromes P-450, catalases, peroxidases as well as b type cytochromes.
- heme B biosynthetic process
The chemical reactions and pathways resulting in the formation of heme B, a Fe(II) porphyrin complex readily isolated from the hemoglobin of beef blood, but also found in other proteins including other hemoglobins, myoglobins, cytochromes P-450, catalases, peroxidases as well as b type cytochromes.