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• Bioengineering •     Next Articles

Characterization of recombinant phenylalanine aminomutase from Taxus chinensis and synthesis of R-β-arylalanine

2,Ping SONG3, 2, 2,   

  • Received:2019-12-12 Revised:2020-11-25 Online:2021-03-25 Published:2021-03-22

Abstract: Abstract: In order to synthesize high value β-arylalanine, the gene of phenylalanine aminomutase form Taxus chinensis was cloned and expressed in E.coli. The expression vector Pet-sumo-Tcpam was successfully constructed and transferred into E.coli BL21 to express the recombinant enzyme (TcPAM). The electrophoretically pure TcPAM was prepared using affinity chromatography. The results of MS and CD showed that TcPAM could catalyze isomerization of α-arylalanine to R-β-arylalanine. The activity of TcPAM was 4.11 U/mg at optimum condition of 30℃ and pH9.Metal ions K+, Fe2+, Ca2+ and surfactants CTAB,SDS,Triton X-100,Tween 80 had little effect on the activity, and about 90% of activity remained, while Cu2+and Zn2+ had strong inhibitory effect on TcPAM, Furthermore, the α-arylalanines with different groups at benzene ring were used as substrates. The results suggested that the electron-withdrawing group at benzene ring of substrate promote the shift of α-amino group to β site to improve yield of β-aralyalaines, the yield of 4-MeO-β-phenylalanine reached 45 %.

Key words: Keywords: Taxus chinensis, Phenylalanine ainomutase, β-arylalanine

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