Crystallization (Comment) | Organism |
---|---|
purified enzyme in complex with products histidiol or phosphate, or substrate histidinol phosphate with Mg2+, or Lys-CH2-Cys, sitting drop vapor diffusion, mixing of 19 mg/ml protein solution with crystallization solution containing 15% PEG 3350, and 0.2 M diammonium hydrogen phosphate, pH 8.0, or 30% PEG 3350, 0.1 M Bis-Tris, pH 6.5, 0.2 M ammonium acetate, and 10 mM magnesium acetate, over the reservoir supplemented with 100 mM formaldehyde to complete cross-linking between Lys158 and Cys245 and vitrified in Paraton-N, X-ray diffraction structure determination and analysis at 1.19-1.36 A resolution | Medicago truncatula |
Protein Variants | Comment | Organism |
---|---|---|
T151A | site-directed mutagenesis, inactive mutant | Medicago truncatula |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
Li+ | slight inhibition | Medicago truncatula |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | Michaelis-Menten kinetics | Medicago truncatula | |
0.263 | - |
L-histidinol phosphate | pH 8.4, 22°C | Medicago truncatula |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | required for activity, best at 5 mM | Medicago truncatula |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
61358 | - |
dimer, mass spectrometry | Medicago truncatula |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-histidinol phosphate + H2O | Medicago truncatula | - |
L-histidinol + phosphate | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Medicago truncatula | G7J7Q5 | Medicago tribuloides | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-histidinol phosphate + H2O | - |
Medicago truncatula | L-histidinol + phosphate | - |
? |
Subunits | Comment | Organism |
---|---|---|
dimer | 2 * 30378, recombinant enzyme, mass spectrometry, the monomer is with the N-terminal SNA linker that resides after cleavage with tobacco etch virus protease, plus the difference from the two added methylene groups (24 Da) with SNAMSS adduct (577.6 Da) that most probably is an artifact resulting from the MS experiment | Medicago truncatula |
More | covalent dimerization of MtHPP, a monomer of MtHPP has an alphabetaalphabetaalpha-sandwich-like arrangement. The N-terminal domain, which forms an alpha + beta structure, covers residues from the N-terminus to Glu201. Two long alpha-helices (alpha1 and alpha2) are separated by a mobile loop. The eight-stranded beta-sheet of the N-terminal domain contains a alpha-loop motif (residues 131-149), where the beta1 strand is flanked by strands beta2 and beta3. Moreover, a loop between strands beta3 and beta4 encompasses the helix beta3. Strands beta3-beta8 have antiparallel organization. The linker between the N- and C-terminal domains consists of residues between Val202 and Asp209. An extensive interface between the N- and C-terminal domains results in the rigidity of the entire structure, meaning that there is no hinge between the two domains, and they cannot move independently. The C-terminal domain, residues Leu210-Trp326, constitutes an alpha/beta/alpha fold, in which the mixed parallel/antiparallel beta-sheet is sandwiched between helices alpha6, eta7 (310 helix), and alpha8 from one side (close to the beta-sheet of the N-terminal domain) and eta4, alpha5, and alpha9 from the other. MtHPP dimeric assembly is stabilized by intermolecular Lys-CH2-Cys covalent bonds | Medicago truncatula |
Synonyms | Comment | Organism |
---|---|---|
11419457 | locus name | Medicago truncatula |
histidinol phosphate phosphatase | - |
Medicago truncatula |
HOLP | - |
Medicago truncatula |
IMPase-like HPP | - |
Medicago truncatula |
MtHPP | - |
Medicago truncatula |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
22 | - |
assay at room temperature | Medicago truncatula |
Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
3.6 | - |
L-histidinol phosphate | pH 8.4, 22°C | Medicago truncatula |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
8.4 | - |
- |
Medicago truncatula |
IC50 Value | IC50 Value Maximum | Comment | Organism | Inhibitor | Structure |
---|---|---|---|---|---|
5.5 | - |
pH 8.4, 22°C | Medicago truncatula | Li+ |
General Information | Comment | Organism |
---|---|---|
additional information | the histidinol phosphate dephosphorylation reaction occurs at the interface between N- and C-terminal domains, structure-function relationship, active site structure with bound substrate, overview | Medicago truncatula |
physiological function | IMPase-like HPPs play a role only in His biosynthesis | Medicago truncatula |
kcat/KM Value [1/mMs-1] | kcat/KM Value Maximum [1/mMs-1] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
13.69 | - |
L-histidinol phosphate | pH 8.4, 22°C | Medicago truncatula |