O-Methyl-L-Tyrosine → L-Tyrosine

HRID 2220799Notes

Reaction equation

HRID 2220799 reaction equation
C[O:2][C:3]1[CH:14]=[CH:13][C:6]([CH2:7][C@@H:8]([C:10]([OH:12])=[O:11])[NH2:9])=[CH:5][CH:4]=1.C([O-])(=O)CC[C@H](NC(C1C=CC(NCC2CNC3N=C(NC(C=3N=2)=O)N)=CC=1)=O)C(O)=O>>[NH2:9][C@H:8]([C:10]([OH:12])=[O:11])[CH2:7][C:6]1[CH:5]=[CH:4][C:3]([OH:2])=[CH:14][CH:13]=1

Participants

3

Reactant 2

HCID 2723935O-Methyl-L-Tyrosine2×HCID 136400727(4S)-4-[[4-[(2-amino-4-oxo-7,8-dihydro-3H-pteridin-6-yl)methylamino]benzoyl]amino]-5-hydroxy-5-oxopentanoate

Product 1

HCID 6057L-Tyrosine

Procedure

To further demonstrate that the observed phenotype is due to the site-specific incorporation of O-methyl-L-tyrosine by the orthogonal mtRNACUATyr/mutant TyrRS (LWJ16) pair in response to an amber stop codon, an O-methyl-L-tyrosine mutant of dihydrofolate reductase (DHFR) was generated and characterized. The third codon of the E. coli DHFR gene (a permissive site) was mutated to TAG and a C-terminal His6 tag was added in order to separate the mutant protein from endogenous E. coli DHFR. As a control, the mtRNACUATyr was coexpressed with the wild type M. jannaschii TyrRS, resulting in efficient suppression of the nonsense codon in DHFR with tyrosine. See FIG. 2. When the mutant TyrRS (LWJ16) was expressed in the presence of mtRNACUATyr and 1 mM O-methyl-L-tyrosine in liquid GMML growth media, full length DHFR was also produced and could be purified by Ni affinity chromatography with an isolated yield of 2 mg/liter.

Workup

  1. additiona C-terminal His6 tag was added in order
  2. customto separate the mutant protein from endogenous E

Sources & evidence

ORD record
ord-daee4119d6f44d79ac1d8dd538d57972
Source dataset
uspto-grants-2008_05
Patent number
US07368275B2

Reaction notes

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