This study aimed to investigate the synergism of the TAT PTD （ protein transduction domain in HIV-1 transactivator of transcription protein） to antibacte- rial peptide tachyplesin from Tachp/eus tr/dentatus. Treated with Pichia pastoris preferred codon optimization, using the eDNA sequence of tuchyplesin mature pep- tide （54 aa） harboring TAT FFD sequence （11 aa） as reference template, six single-stranded oligonueleotides were designed, the sequences of restriction sites EcoR I and Xba I were introduced to the 5＇ end of primers P1 and P6, respectively. TAT PTD ＋ Tachyplesin fusion gene with a full length of 219 bp was artificially synthesized by overlap extension PCR, which laid the preliminary foundation for subsequent functional and synergism studies.
