Activating Compound | Comment | Organism | Structure |
---|---|---|---|
SH-groups | wild type and mutant enzyme each contain two SH groups per alpha-chain | Lactobacillus sp. |
Protein Variants | Comment | Organism |
---|---|---|
S51A/G58D | mutant enzyme 3 has two amino acid replacements, both in the beta chain: Ser51 is replaced by Ala and Gly58 by Asp. In addition, about 15% of the mutant beta chains contain Met-Ser at the NH2-terminus rather than Ser. These replacements decrease stability of the enzyme and change its pH activity profile, but do not decrease its activity at pH 4.8, its optimum | Lactobacillus sp. |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
1.4 | - |
L-His | wild-type enzyme | Lactobacillus sp. | |
35 | - |
L-His | mutant enzyme | Lactobacillus sp. |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Lactobacillus sp. | - |
wild-type and and mutant enzyme | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-His | - |
Lactobacillus sp. | Histamine + CO2 | - |
? |
Subunits | Comment | Organism |
---|---|---|
More | a pyruvate-free proenzyme pi-chain, MW: 37000, is converted during activation to a beta-chain, MW 9000, with a carboxy-terminal Ser residue and an alpha-chain, MW: 28000, with a pyruvoyl group blocking the amino-terminus | Lactobacillus sp. |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
4.8 | - |
wild-type and mutant enzyme | Lactobacillus sp. |