Amino acid sequence of the diazooxonorleucine binding site of Acinetobacter and Pseudomonas 7A glutaminase--asparaginase enzymes.
Acinetobactor glutaminase-asparaginase was treated with [6-14C]diazo-5-oxonorleucine, reduced with sodium borohydride, and cleaved with cyanogen bromide. Radioactivity was present only in a 96-residue-N-terminal peptide which eluted as the second peptide peak on Sephadex G-50. Radioactivity was released with the threonine in position 12 during automatic sequencing of this peptide. The amino acid sequence of a 60-residue tn-terminal segment and a 16-residue C-terminal segment of this peptide was determined. Pseudomonas 7 A glutaminase-asparaginase was treated with [6-14C]diazo-5-oxonorleucine and reduced with sodium borohydride. Radioactivity was released with the threonine in residue 20 during automatic sequencing of the whole enzyme. Analysis of 26 N-terminal residues showed that an 8-residue segment containing the radioactive threonine was identical with that in Acinetobacter glutaminase-asparaginase and in Escherichia coli asparaginase. Additional identical residues were noted in the N-terminal regions of these enzymes.
D000150:Acinetobacter / Q000201:enzymology*; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D001215:Asparaginase / Q000378:metabolism; D001391:Azo Compounds / Q000494:pharmacology; D001665:Binding Sites; D003980:Diazooxonorleucine / Q000494:pharmacology; D005972:Glutaminase / Q000378:metabolism; D011485:Protein Binding; D011549:Pseudomonas / Q000201:enzymology*; D013045:Species Specificity
D000596:Amino Acids; D001391:Azo Compounds; D003980:Diazooxonorleucine; D001215:Asparaginase; D005972:Glutaminase