The members of this family are probably all pyridoxal-phosphate-dependent aminotransferase enzymes with a variety of molecular functions. The family includes StsA Swiss:P72454, StsC Swiss:P77952 and StsS [1]. The aminotransferase activity was demons ...
The members of this family are probably all pyridoxal-phosphate-dependent aminotransferase enzymes with a variety of molecular functions. The family includes StsA Swiss:P72454, StsC Swiss:P77952 and StsS [1]. The aminotransferase activity was demonstrated for purified StsC protein as the L-glutamine:scyllo-inosose aminotransferase EC:2.6.1.50, which catalyses the first amino transfer in the biosynthesis of the streptidine subunit of streptomycin [1].
Catalyzes the dehydration and aromatization of 5-amino- 5-deoxy-3-dehydroshikimate (aminoDHS) to 3-amino-5-hydroxybenzoate (AHBA), a compound that then serves as the starter unit for the assembly of a polyketide during the biosynthesis of rifamycin B and other ansamycin antibiotics. Cannot utilize 5-deoxy-5-amino-3- dehydroquinate (aminoDHQ), 5-deoxy-5-aminoshikimate (aminoSA), quinate, 3-dehydroquinate, or 3-dehydroshikimate (DHS) as substrate.
In a complex with RifL, RifK may have a second function in the AHBA pathway, acting as a transaminase introducing the nitrogen into the first pathway intermediate, UDP-3-keto-D-glucose, to give UDP-kanosamine. Appears to use glutamine as the nitrogen donor; NH4+ or asparagine are 30% less effective as nitrogen donors and neither glutamate nor aspartate show activity.
Defined by 8 residues: PHE:A-88ASP:A-159HIS:A-162GLN:A-185LYS:A-188ARG:A_2-219TYR:A_2-226ARG:A_2-236
