Cloned (Comment) | Organism |
---|---|
gene btrR, expression in Escherichia coli strain BL21 (DE3) as His-tagged enzyme | Niallia circulans |
Crystallization (Comment) | Organism |
---|---|
purified recombinant enzyme complexed with pyridoxamine 5'-phosphate or pyridoxal 5'-phosphate, 7-14 days, X-ray diffraction structure determination and analysis at 1.7 A and 2.1 A resolution, respectively | Niallia circulans |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
additional information | no inhibition by gabaculine, i.e. 3-amino-2,3-dihydrobenzoic acid, and (amino-oxy) acetic acid | Niallia circulans |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-glutamine + 3-amino-2,3-dideoxy-scyllo-inosose | Niallia circulans | - |
2-oxoglutaramate + 2-deoxystreptamine | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Niallia circulans | Q8G8Y2 | gene btrR | - |
Purification (Comment) | Organism |
---|---|
recombinant His-tagged BtrR from Escherichia coli strain BL21 (DE3) by nickel affinity chromatography and gel filtration | Niallia circulans |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-glutamine + 3-amino-2,3-dideoxy-scyllo-inosose | - |
Niallia circulans | 2-oxoglutaramate + 2-deoxystreptamine | - |
? | |
additional information | BtrR accepts four different carbocyclic substrates, 2-deoxy-scyllo-inosose, 2-deoxy-scyllo-inosamine, amino-dideoxyscyllo-inosose, and 2-deoxysteptamine, requiring the binding site in the enzyme to have some flexibility. NeoB also shows L-glutamine:2-deoxy-scyllo-inosose aminotransferase activity resulting in formation of 2-deoxy-scyllo-inosamine, EC 2.6.1.100 | Niallia circulans | ? | - |
? |
Subunits | Comment | Organism |
---|---|---|
homodimer | the active site of the BtrR protomer is located in a cleft between an alpha-helical N-terminus, a central alphabetaalpha-sandwich domain and an alphabeta-C-terminal domain, three-dimensional structure, overview | Niallia circulans |
Synonyms | Comment | Organism |
---|---|---|
btrR | - |
Niallia circulans |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
pyridoxal 5'-phosphate | dependent on, binding structure and structural changes upon pyridoxal 5'-phosphate to pyridoxamine 5'-phosphate conversion, overview | Niallia circulans |
General Information | Comment | Organism |
---|---|---|
evolution | BtrR has a fold characteristic of the aspartate aminotransferase family and is a member of the class of aminotransferases that function primarily in the biosynthesis of secondary metabolites, SMAT, i.e. the secondary metabolite aminotransferases subfamily | Niallia circulans |
metabolism | the aminotransferase BtrR is involved in the biosynthesis of butirosin | Niallia circulans |
additional information | active site structure of BtrR, homodimer with two active sites per dimer, BtrR with bound pyridoxamine 5'-phosphate lacks the covalent bond to Lys192. The active site of the BtrR protomer is located in a cleft between an alpha-helical N-terminus, a central alphabetaalpha-sandwich domain and an alphabeta-C-terminal domain | Niallia circulans |
physiological function | the aminotransferase BtrR is involved in the biosynthesis of butirosin, a 2-deoxystreptamine-containing aminoglycoside antibiotic produced by Bacillus circulans, catalyzing the pyridoxal 5'-phosphate-dependent transamination reaction both of 2-deoxy-scylloinosose to 2-deoxy-scyllo-inosamine, cf. EC 2.6.1.100, and of amino-dideoxy-scyllo-inosose to 2-deoxystreptamine | Niallia circulans |