Anti-bfgf humanized double-stranded antibody with stable disulfide bond, preparation method and application thereof

Abstract

Disclosed are an anti-bFGF humanized double-stranded antibody with stable disulfide bond, the preparation method and the applications thereof. The amino acid sequence of the anti-bFGF humanized ds-Diabody is shown in SEQ ID NO. 1. The nucleotide sequence of gene encoding the anti-bFGF humanized ds-Diabody is shown in SEQ ID NO. 2. By site-directed mutation, two cysteine residues are introduced into each single-stranded antibody, thus introducing the disulfide bond and form ds-Diabody. It is shown by experiments that the obtained ds-Diabody has the following advantages: enhanced stability; better affinity when binding to the specific antigen bFGF; moderate relative molecular weight, good tumor targeting, more powerful in tumor tissue penetration, and higher blood clearance rate, showing a broad application prospects in the clinic diagnosis and tumor therapy.

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