Site-Directed Polyethylene Glycol Modification of Trichosanthin

HE Xianhui,NIE Huiling ** ,SHAW Pangchui 1) ,KE Yibao,TAM Siucheung 2)

Chinese Journal of Biochemistry and Molecular Biology ›› 1999, Vol. 15 ›› Issue (06) : 924-927.

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Chinese Journal of Biochemistry and Molecular Biology ›› 1999, Vol. 15 ›› Issue (06) : 924-927.
Article

Site-Directed Polyethylene Glycol Modification of Trichosanthin

  • HE Xianhui,NIE Huiling ** ,SHAW Pangchui 1) ,KE Yibao,TAM Siucheung 2)
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Abstract

The site directed polyethylene glycol(PEG)modification(PEGylation)had been establishied to couple PEG to a pre selected site on trichosanthin(TCS)which in its natural form had no Cys residue.By site directed mutagenesis,a Cys residue can be introduced to replace the 7th residue Ser and PEG was then coupled to this newly created Cys by PEG maleimide.The PEG TCS conjugate was purified to homogeneity and showed a single band on SDS PAGE with an apparent molecular weight of 38 kD.Its ribosome inactivating activity in vitro was reduced by 6 fold,whereas the abortifacient activity in vivo was comparable to nTCS.The site directed PEGylation has provided a new approach for reconstructing TCS.

Key words

Trichosanthin / Site directed mutagenesis / PEGylation / Ribosome-inactivating activity

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HE Xianhui,NIE Huiling ** ,SHAW Pangchui 1) ,KE Yibao,TAM Siucheung 2). Site-Directed Polyethylene Glycol Modification of Trichosanthin[J]. Chinese Journal of Biochemistry and Molecular Biology, 1999, 15(06): 924-927

References

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