Activating Compound | Comment | Organism | Structure |
---|---|---|---|
oxythiamine | inhibitor of human enzyme, is not inhibitory up to 0.03 mM. Instead, oxythiamine, at this concentration, increases the rate of the reaction by 30% under the assay conditions tested | Mycobacterium tuberculosis |
Cloned (Comment) | Organism |
---|---|
expression in Escherichia coli | Mycobacterium tuberculosis |
Crystallization (Comment) | Organism |
---|---|
to 2.5 A resolution. Final model includes 410 water molecules, four thiamine diphosphate molecules, 4 Mg2+ ions and eight glycerol molecules. The enzyme forms a homodimer, where the two monomeric units are related by a non-crystallographic twofold axis. There are two dimers per asymmetric unit that are related to each other by a twofold axis to create a noncrystallographic screw axis parallel to the crystallographic Z-axis | Mycobacterium tuberculosis |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
additional information | oxythiamine, inhibitor of human enzyme, is not inhibitory up to 0.03 mM. Instead, oxythiamine, at this concentration, increases the rate of the reaction by 30% under the assay conditions tested. 5-benzyl-3-phenylpyrazolo[1,5-a]pyrimidin-7(4H)-one also has no inhibitory effect | Mycobacterium tuberculosis |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
0.4 | - |
D-xylulose 5-phosphate | pH 7.6, 37°C | Mycobacterium tuberculosis | |
0.6 | - |
D-fructose 6-phosphate | pH 7.6, 37°C | Mycobacterium tuberculosis | |
0.8 | - |
D-ribose 5-phosphate | pH 7.6, 37°C | Mycobacterium tuberculosis |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | The Mg2+ ion is octahedrally coordinated to residues Asp177, Asn207 and Ile209, along with two oxygen atoms of the diphosphate moiety of the cofactor thiamine diphosphate and a water molecule | Mycobacterium tuberculosis |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Mycobacterium tuberculosis | P9WG25 | - |
- |
Mycobacterium tuberculosis H37Rv | P9WG25 | - |
- |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
D-fructose 6-phosphate + Fe(CN)3- | - |
Mycobacterium tuberculosis | glycolic acid + D-erythrose 4-phosphate + Fe(CN)64- + H+ | - |
? | |
D-fructose 6-phosphate + Fe(CN)3- | - |
Mycobacterium tuberculosis H37Rv | glycolic acid + D-erythrose 4-phosphate + Fe(CN)64- + H+ | - |
? | |
D-xylulose 5-phosphate + D-ribose 5-phosphate | - |
Mycobacterium tuberculosis | sedoheptulose 7-phosphate + D-glyceraldehyde 3-phosphate | - |
? | |
D-xylulose 5-phosphate + D-ribose 5-phosphate | - |
Mycobacterium tuberculosis H37Rv | sedoheptulose 7-phosphate + D-glyceraldehyde 3-phosphate | - |
? |
Subunits | Comment | Organism |
---|---|---|
dimer | crystallization data | Mycobacterium tuberculosis |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
thiamine diphosphate | an active site cleft is formed between the two monomeric units allowing the cofactors thiamine diphosphate and Mg2+ to bind, such that the N-terminal domain I of chain A binds the diphosphate moiety of thiamine diphosphate, and domain II of chain B interacts with the aminopyrimidine ring. The diphosphate moiety of thiamine diphosphate is anchored in place through a number of hydrogen bonds formed with residues Thr48, His85, Ser176, Asp177, Gly178, Asn207, Ile209 and His283 from one monomer, crystallization data | Mycobacterium tuberculosis |