O-Methyl-L-Tyrosine → L-Tyrosine

HRID 1640379Notes

Reaction equation

HRID 1640379 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-26adfdbe29ed4ccc93254ee2cd17bac0
Source dataset
uspto-grants-2012_02
Patent number
US08114648B2

Reaction notes

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