Requires Fe2+ and ascorbate. The enzyme, isolated from Rhizobium species, only produces cis-4-hydroxy-L-proline (cf. EC 1.14.11.57, L-proline trans-4-hydroxylase).
The enzyme appears in viruses and cellular organisms
Requires Fe2+ and ascorbate. The enzyme, isolated from Rhizobium species, only produces cis-4-hydroxy-L-proline (cf. EC 1.14.11.57, L-proline trans-4-hydroxylase).
Substrates: mutant enzyme W40M shows 8.3fold increase in turnover number for L-homophenylalanine as compared to wild-type enzyme and mutant enzyme W40M/I103L shows 112fold increase in turnover number. Mutation reprograms the natural hydroxylase to predominantly act as a desaturase, giving almost exclusively 3,4-desaturated L-homophenylalanine, through capability of tyrosine to serve as a catalytic entity in the reaction mechanism Products: -
?
L-pipecolate + 2-oxoglutarate + O2
cis-5-hydroxypipecolate + cis-3-hydroxypipecolate + succinate + CO2
exogenous Co2+ is coordinated by residues H106, H154, and D108. Co2+ is a mimic of the catalytic metal center because of its stability under aerobic conditions and its enzymatic inactivity under anaerobic conditions. The cis-face of the C4 carbon of L-Pro is properly oriented toward Co2+, which in nature exists as FeIV=O during the hydroxylation reaction, to generate the enantiopure cis-4-hydroxyproline
the enzyme catalyze the hydroxylation of L-proline, generating cis-4-hydroxy-L-proline, as well as the hydroxylation of L-pipecolic acid (L-Pip), generating two regioisomers, cis-5-hydroxypipecolate and cis-3-hydroxypipecolate in a 6:4 ratio
the enzyme catalyze the hydroxylation of L-proline, generating cis-4-hydroxy-L-proline, as well as the hydroxylation of L-pipecolic acid (L-Pip), generating two regioisomers, cis-5-hydroxypipecolate and cis-3-hydroxypipecolate in a 6:4 ratio
I95, I97, and E114 are active site residues, the active site was composed of a distorted jelly roll beta-sheet core, which is sandwiched by the N-terminal and C-terminal alpha-helical domains
I95, I97, and E114 are active site residues, the active site was composed of a distorted jelly roll beta-sheet core, which is sandwiched by the N-terminal and C-terminal alpha-helical domains
V95, V97, and G114 are active site residues, a structure homology model of the SmP4H triple mutant V97F/V95W/E114G is constructed based on the MlP4H crystal structure
V95, V97, and G114 are active site residues, a structure homology model of the SmP4H triple mutant V97F/V95W/E114G is constructed based on the MlP4H crystal structure
in complex with in complex with Co2+, 2-oxoglutarate as cofactors, and L-proline or L-pipecolic acid. The active site is composed of a distorted jelly roll beta-sheet core, which is sandwiched by the N-terminal and C-terminal alpha-helical domains. Co2+ is coordinated by residues H106, H154, and D108
purified recombinant enzyme MlP4H in complex with Co2+, 2-oxoglutarate and L-Pro or L-Pip, the MlP4H protein used for crystallization includes an extra (Met)-Ser-Ala-Trp-Ser-His-Pro-Gln-Phe-Gly-Lys-Gly-Ala strep-tag II peptide at its N-terminus, and the original start codon of the wild-type is replaced by the underlined alanine, followed by the second codon of the wild-type. Crystallization of L-Pro complex crystals by sitting-drop vapor diffusion method mixing 0.001 ml of 28 mg/ml protein solution containing 2 mM CoCl2, 10 mM 2-oxoglutarate, and 20 mM L-Pro with reservoir solution containing 0.1 M bis-Tris propane, pH 8.5, 0.2 M sodium malonate, and 25% v/v PEG 3350, or of L-Pip complex crystals by sitting drop vapour diffusion method mixing 0.001 ml of 28 mg/ml protein solution containing 2 mM CoCl2, 10 mM ?2-oxoglutarate, and 20 mM L-Pip with 0.001 ml of reservoir solution containing 0.1 M CAPS, pH 10.5, 0.1 M lithium sulfate, and 1.8 M ammonium sulfate, all at 15°C, X-ray diffraction structure determination and analysis at 1.3-2.8 A resolution, by single-wavelength dispersion method with the bound Co2+ at the active site used as the anomalous scatter or by molecular replacement using the first L-Pro-bound structure as a search model
remodeling of L-proline cis-4-hydroxylase into a halogenase. Halogenation of L-proline exclusively occurs at the C3-position, the retained hydroxylation activity leads to derivatization at the C4-position
site-directed mutagenesis, the mutant does not show any increase in hydroxylation activity nor any improvement in the cis-5/cis-3 ratio compared to the wild-type enzyme
site-directed mutagenesis, the mutant does not show any increase in hydroxylation activity nor any improvement in the cis-5/cis-3 ratio compared to the wild-type enzyme
site-directed mutagenesis, the mutant shows improved regioselectivity of hydroxylation, the cis-5/cis-3 ratio improves from 1.4 for the wild-type enzyme to 5.3 for the mutant, the increase in activity is similar compared to mutant V97A, the V97F mutant demonstrates higher selectivity of C5-hydroxylation
site-directed mutagenesis, protein engineering of L-proline cis-4-hydroxylase based on the X-ray crystal structure leading to refined regio- and stereoselective hydroxylation of L-pipecolic acid, the engineered mutant enzyme produces 96% cis-5-hydroxypipecolate and 4% cis-3-hydroxypipecolate while the wild-type produces 60% cis-5-hydroxypipecolate and 40% cis-3-hydroxypipecolate. A structure homology model of the SmP4H triple mutant V97F/V95W/E114G is constructed based on the MlP4H crystal structure. addition of the E114G mutation improves the activity approximately 2fold compared to double mutant V97F/V95W. The triple mutant shows the highest growth and productivity of cis-5-hydroxy-L-pipecolate in a regioselective manner
site-directed mutagenesis, the mutant shows improved regioselectivity of hydroxylation, the cis-5/cis-3 ratio improves from 1.4 for the wild-type enzyme to 9.0 for the mutant, the increase in activity is decreased compared to mutant V97F
acceptance of the native substrate L-proline is almost completely abolished. 8.3fold increase in turnover number for L-homophenylalanine as compared to wild-type enzyme. Mutation reprograms the natural hydroxylase to predominantly act as a desaturase, giving almost exclusively 3,4-desaturated L-homophenylalanine, through capability of tyrosine to serve as a catalytic entity in the reaction mechanism
acceptance of the native substrate L-proline is almost completely abolished. 112fold increase in turnover number for L-homophenylalanine and and about 300fold improved kcat/Km compared to the wild-type enzyme
Please wait a moment until the data is sorted. This message will disappear when the data is sorted.
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
recombinant Strep-tagged wild-type enzyme from Escherichia coli strain W3110 extract by ultracentrifugation, affinity and anion exchange chrmatography, and gel filtration
coexpression of L-proline cis-4-hydroxylase and N-acetyltransferase Mpr1 from Saccharomyces cerevisiae converting cis-4-hydroxy-L-proline into N-acetyl cis-4-hydroxy-L-proline in Escherichia coli. M9 medium containing L-proline produces more N-acetyl cis-4-hydroxy-L-proline than LB medium containing L-proline. The addition of NaCl and L-ascorbate results in a 2fold increase in N-acetyl cis-4-hydroxy-L-proline production in the L-proline-containing M9 medium
Microbial production of N-acetyl cis-4-hydroxy-L-proline by coexpression of the Rhizobium L-proline cis-4-hydroxylase and the yeast N-acetyltransferase Mpr1
Koketsu, K.; Shomura, Y.; Moriwaki, K.; Hayashi, M.; Mitsuhashi, S.; Hara, R.; Kino, K.; Higuchi, Y.
Refined regio- and stereoselective hydroxylation of L-pipecolic acid by protein engineering of L-proline cis-4-hydroxylase based on the X-ray crystal structure
Koketsu, K.; Shomura, Y.; Moriwaki, K.; Hayashi, M.; Mitsuhashi, S.; Hara, R.; Kino, K.; Higuchi, Y.
Refined regio- and stereoselective hydroxylation of L-pipecolic acid by protein engineering of L-proline cis-4-hydroxylase based on the X-ray crystal structure