Difference between revisions of "Part:BBa K1722003"

Revision as of 03:55, 3 September 2015

AckRS can produce a aminoacyl tRNA synthetase.

AckRS is a gene which can produce a kind of aminoacyl tRNA synthetase(aaRS) that can achieve the attachment of Acetyllysine(Ack) and tRNA.Ack is a kind of unnatural amino acid(UAA) that is close structural analog of Lysine, a canonocal amino acid.

In the orthogonal system of the project of 2015 SZU-iGEM, the construction of our UAA orthogonal system rely on an orthogonal pair of tRNA(CUA) and an AckRS charging the tRNA with Ack. tRNA(CUA) has an anticodon CUA, which can pair with UAG, the amber mutated stop codon, perfectly. With the help of AckRS, the unnatural amino acid Ack can be incorporated into proteins.

aaRS functioning in the form of polycomplex in living cells.^[1,2] Research on Structural Biology and Bioinformatics shows that aaRS can combine with other proteins, forming highly organized complex, to be involved in many vital physiological processes.^[1,2] In the last decade, methods for the translational incorporation of UAAs using orthogonal aaRS-tRNA(CUA) pairs were developed. With modified aaRS which can specifically recognise a type of UAA, the UAA can be site-specifically incorporated to produce a protein with new structure and function or to expand the genetic code. The wild-type pyrrolysyl-tRNA synthatase(PylRS) from Methanosarcina mazei readily accepts a number of lysine derivatives as substrates. This enzyme can further be engineered by mutagenesis to utilize a range of UAAs^[3] and the AckRS that we used in our project is one of them.

Sequence and Features