title: The expression in E. coli of synthetic repeating polymeric genes coding for poly(L-aspartyl-L-phenylalanine).
abstract: Two dodecadeoxynucleotides of defined sequence have been synthesised by phosphotriester methodology. They can be polymerised to give a double stranded DNA which codes, when read in the correct phase, for the repeating dipeptide poly(aspartyl-phenylalanine). This polymeric DNA has been cloned in E. coli K12 using as vector a plasmid having a controllable bacterial promoter upstream of the insertion site. Clones containing genes coding for up to 150 repeats of (aspartyl-phenylalanine) have been isolated and characterised. The polymeric inserts appear to be stable over many generations and are expressed in E. coli under the control of the bacterial promoter, to give a polymer of phenylalanine and aspartic acid which may be broken down enzymically to yield aspartyl-phenylalanine.
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D004274:DNA, Recombinant; D004926:Escherichia coli / Q000378:metabolism*; D005796:Genes; D010452:Peptide Biosynthesis; D010455:Peptides; D010957:Plasmids; D014176:Protein Biosynthesis; D012091:Repetitive Sequences, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D004274:DNA, Recombinant; D010455:Peptides; C027751:poly(L-aspartyl-L-phenylalanine)