Post-translational modification of specific protein by attachment of biotin. Acts on various carboxylases such as acetyl-CoA-carboxylase, pyruvate carboxylase, propionyl CoA carboxylase, and 3-methylcrotonyl CoA carboxylase. apo-[methylmalonyl-CoA:pyruvate carboxytransferase] + ATP + biotin = AMP + diphosphate + H(+) + holo-[methylmalonyl-CoA:pyruvate carboxytransferase] apo-[propionyl-CoA:carbon-dioxide ligase (ADP-forming)] + ATP + biotin = AMP + diphosphate + H(+) + holo-[propionyl-CoA:carbon-dioxide ligase (ADP-forming)] apo-[3-methylcrotonoyl-CoA:carbon-dioxide ligase (ADP-forming)] + ATP + biotin = AMP + diphosphate + H(+) + holo-[3-methylcrotonoyl-CoA:carbon-dioxide ligase (ADP-forming)] ATP + biotin + L-lysyl-[protein] = AMP + diphosphate + H(+) + N(6)-biotinyl-L-lysyl-[protein] Monomer. Present with 1970 molecules/cell in log phase SD medium. Belongs to the biotin--protein ligase family.