Belongs to the bacterial ribosomal protein bS21 family.
Belongs to the N(4)/N(6)-methyltransferase family. N(4) subfamily.
Belongs to the 'phage' integrase family.
Site-specific tyrosine recombinase, which acts by catalyzing the cutting and rejoining of the recombining DNA molecules.
Belongs to the type IA topoisomerase family.
Abolishes the inhibitory effect of tetracyclin on protein synthesis by a non-covalent modification of the ribosomes.