Activating Compound | Comment | Organism | Structure |
---|---|---|---|
glycerol | 20% (v/v) leads to 10-15% increase in glutamylation activity | Crithidia fasciculata |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
ATP | 90% decrease of activity at 10 mM ATP | Crithidia fasciculata | |
KCl | strong inhibition | Crithidia fasciculata | |
Mg2+ | 75% decrease of activity at 20 mM Mg2+ | Crithidia fasciculata | |
NaCl | about 85% inhibition at 300 mM NaCl | Crithidia fasciculata |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
0.0003 | - |
[alpha/beta-tubulin]-L-glutamate | at pH 9.0, temperature not specified in the publication | Crithidia fasciculata | |
0.8 | - |
L-glutamate | at pH 9.0, temperature not specified in the publication | Crithidia fasciculata |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
cytoskeleton | - |
Crithidia fasciculata | 5856 | - |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | dependent on, optimal concentration of 5 mM | Crithidia fasciculata |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
ATP + [alpha/beta-tubulin]-(alpha-L-glutamyl-gamma-L-glutamyl)-L-glutamate + n L-glutamate | Crithidia fasciculata | (1c) | [alpha/beta-tubulin]-(gamma-(poly-alpha-L-glutamyl)-L-glutamyl)-L-glutamate + n ADP + n phosphate | - |
? | |
ATP + [alpha/beta-tubulin]-(gamma-L-glutamyl)-L-glutamate + L-glutamate | Crithidia fasciculata | (1b) | [alpha/beta-tubulin]-(alpha-L-glutamyl-gamma-L-glutamyl)-L-glutamate + ADP + phosphate | - |
? | |
ATP + [alpha/beta-tubulin]-L-glutamate + L-glutamate | Crithidia fasciculata | (1a) | [alpha/beta-tubulin]-(gamma-L-glutamyl)-L-glutamate + ADP + phosphate | - |
? | |
n ATP + [alpha/beta-tubulin]-L-glutamate + n L-glutamate | Crithidia fasciculata | overall reaction. The enzyme incorporates glutamic acid preferentially into the more acidic variants of both alpha- and beta-tubulins | [alpha/beta-tubulin]-(gamma-(poly-alpha-L-glutamyl)-L-glutamyl)-L-glutamate + n ADP + n phosphate | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Crithidia fasciculata | - |
- |
- |
Purification (Comment) | Organism |
---|---|
ATP-affinity chromatography, glycerol-gradient centrifugation and Mono Q ion-exchange chromatography | Crithidia fasciculata |
Source Tissue | Comment | Organism | Textmining |
---|
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
ATP + [alpha/beta-tubulin]-(alpha-L-glutamyl-gamma-L-glutamyl)-L-glutamate + n L-glutamate | (1c) | Crithidia fasciculata | [alpha/beta-tubulin]-(gamma-(poly-alpha-L-glutamyl)-L-glutamyl)-L-glutamate + n ADP + n phosphate | - |
? | |
ATP + [alpha/beta-tubulin]-(gamma-L-glutamyl)-L-glutamate + L-glutamate | (1b) | Crithidia fasciculata | [alpha/beta-tubulin]-(alpha-L-glutamyl-gamma-L-glutamyl)-L-glutamate + ADP + phosphate | - |
? | |
ATP + [alpha/beta-tubulin]-L-glutamate + L-glutamate | (1a) | Crithidia fasciculata | [alpha/beta-tubulin]-(gamma-L-glutamyl)-L-glutamate + ADP + phosphate | - |
? | |
additional information | synthetic peptides with an oligoglutamyl side chain, corresponding to the carboxyterminal end of brain alpha- and beta-tubulins, are accepted by the enzyme, albeit at low efficiency. The enzyme elongates the side chain by up to 3 and 5 residues, respectively. The presence of D-Glu, L-Tyr, Gly, L-Asp in 10-100fold excess over L-Glu do not affect the glutamylation activity. While mammalian brain tubulin is effectively polyglutamylated by the Crithidia enzyme, tubulin from HeLa cells is a poorer substrate | Crithidia fasciculata | ? | - |
- |
|
n ATP + [alpha/beta-tubulin]-L-glutamate + n L-glutamate | overall reaction. The enzyme incorporates glutamic acid preferentially into the more acidic variants of both alpha- and beta-tubulins | Crithidia fasciculata | [alpha/beta-tubulin]-(gamma-(poly-alpha-L-glutamyl)-L-glutamyl)-L-glutamate + n ADP + n phosphate | - |
? |
Subunits | Comment | Organism |
---|---|---|
? | x * 40000, SDS-PAGE | Crithidia fasciculata |
Synonyms | Comment | Organism |
---|---|---|
tubulin polyglutamylase | - |
Crithidia fasciculata |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
9 | - |
- |
Crithidia fasciculata |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
ATP | optimal concentration of 1-2 mM, cannot be replaced by GTP or ATP-gamma-S | Crithidia fasciculata |