title: Optimized gene synthesis, expression and purification of active salivary plasminogen activator alpha2 (DSPAalpha2) of Desmodus rotundus in Pichia pastoris.
abstract: Vampire bat salivary plasminogen activators (DSPAs) are thrombolytic agents that are under clinical investigation for the treatment of acute ischemic stroke. In this study, the synthetic active salivary plasminogen activator alpha2 (DSPAalpha2) gene optimized for the preferred codons of Pichia pastoris was assembled from 48 oligonucleotides, and cloned into the yeast expression vector pPIC9 with a strong enhancer from human cytomegalovirus (HCMV). This system achieved high expression of an active DSPAalpha2 in P. pastoris yeast GS115. Secreted active DSPAalpha2 recombinant protein was purified from broth supernatant by a simple one-step procedure on Sephadex chromatography and was confirmed by SDS-PAGE and Western blot analysis. ELISA showed that 2.5mg of recombinant protein could be obtained from 100-ml culture broth supernatant. The fibrinolytic activity of the recombinant DSPAalpha2 was 1.28 x 10(5)IU/mg.
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China.
authors.forename: Zhaorong
authors.initials: Z
authors.lastname: Wei
authors.forename: Yueju
authors.initials: Y
authors.lastname: Wang
authors.forename: Gangqiang
authors.initials: G
authors.lastname: Li
authors.forename: Xiaokun
authors.initials: X
authors.lastname: Li
authors.forename: Dehu
authors.initials: D
authors.lastname: Liu
mesh_terms: D000818:Animals; D001483:Base Sequence; D015153:Blotting, Western; D002685:Chiroptera / Q000235:genetics*; D002845:Chromatography; D003001:Cloning, Molecular; D003062:Codon; D003587:Cytomegalovirus / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D004742:Enhancer Elements, Genetic; D004797:Enzyme-Linked Immunosorbent Assay; D005337:Fibrin / Q000032:analysis; D005822:Genetic Vectors; D010843:Pichia / Q000235:genetics; D010960:Plasminogen Activators / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism; D012471:Salivary Proteins and Peptides / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*
chemical_list: D003062:Codon; D011994:Recombinant Proteins; D012471:Salivary Proteins and Peptides; D005337:Fibrin; D010960:Plasminogen Activators