title: The nucleotide sequence of the tnpA gene of Tn21.
abstract: The nucleotide sequence of the tnpA gene of Tn21 is presented. The transposase encoded by this gene is exactly the same length (988 amino acids) as the Tn501 transposase (4), and shows 72% homology overall with this protein, with greater homology towards the C-terminus. The sequence of the transposase is discussed in the context of the evolution of Class II transposable elements and of the characteristics of the enzyme's action.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004251:DNA Transposable Elements; D005796:Genes; D005798:Genes, Bacterial; D009713:Nucleotidyltransferases / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid; D019895:Transposases
chemical_list: D004251:DNA Transposable Elements; D009713:Nucleotidyltransferases; D019895:Transposases; D004262:DNA Restriction Enzymes