作者: S A Wolfe , J M Smith
DOI: 10.1016/S0021-9258(18)37402-7
关键词: Adenylosuccinate 、 Primer extension 、 Gene 、 Dyad symmetry 、 Nucleic acid sequence 、 Start codon 、 Adenylosuccinate synthase 、 Molecular biology 、 Escherichia coli 、 Biology 、 Genetics
摘要: Abstract Adenylosuccinate synthetase (EC 6.3.4.4), encoded by the purA gene of Escherichia coli K12, catalyzes synthesis adenylosuccinate (SAMP) from IMP, first committed step in AMP biosynthesis. The E. K12 and flanking DNA was cloned miniMu-mediated transduction, nucleotide sequence determined. mature SAMP subunit, as deduced sequence, contains 427 amino acid residues has a calculated Mr 47,277. size mRNA determined Northern blotting to be approximately 1.5 kilobase pairs. 5'-end identified primer extension is located 23 nucleotides upstream ATG translational initiation codon. Comparison control region with guaBA revealed common dyad symmetry which may suggest mutual elements regulation. did not resemble regions other known pur loci.