Part:BBa_K2020043

AzF-Synthetase for use in E.coli

This is the 4-Azido-L-phenylalanine-synthetase to be used as a orthogonal synthetase in E.coli. This part can be used together with the cognate tRNA BBa_K2020042 to incorporate AzF in response to an amber stop codon.

Usage and Biology

Assembly in a synthetase plasmid for incorporation of ncAA

pACYC derived plasmid with AzF-synthetase and cognate tRNA

Most synthetases are used with low copy plasmids (e.g. pACYC). Assemble the tRNA and the synthetase into a low copy plasmid, each one with an own promoter and one terminator for both. (See picture). If your application is not for incorporation into a protein but for use with a second plasmid, make shure to use replicons from different incompatibility groups, eg. ColE1 and p15A and different selection markers. A second plasmid could be the flourescent reporter plasmid pFRY for the purpose of determining fidelity and efficiacy of synthetases for ncAA.

Recognition between tRNA and (n)cAA-synthetases derived from Mj

Methanococcus janaschii wild type tyrosyl tRNA consists of two arms: Firstly the acceptor-minihelix, where the amino acid will be attached to the 3' end. Secondly the anticodon containg arm. Synthetases interact mainly with the acceptor minihelix of the tRNA. Due to the lack of most of a recognizing element within the anticodon containg section, a mutation of a anticodon base has a relatively small effect on the aminoacylation efficiency [2] and may explain why a variety of ncAA can be incorporated with this tRNA.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  INCOMPATIBLE WITH RFC[1000]

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