Constitutive expression of human angiostatin in Pichia pastoris using the GAP promoter.
The GAP gene promoter was amplified from P. pastoris GS115 and used to replace the AOX1 promoter (P(AOX1)) on pPIC9K resulting in plasmid pGAP9K. The recombinant expression vector pGAP9K-AS was constructed by inserting the angiostatin gene(AS) into pGAP9K. pGAP9K-AS was then transformed into P. pastoris GS115. The multi-copy integration transformant P. pastoris GS115 (pGAP9K-AS) was used to investigate the constitutive expression of angiostatin in P. pastoris. The expression of angiostatin reached its peak after 4 d of culture in P. pastoris GS115 (pGAP9K-AS) while the angiostatin expressed in P. pastoris GS115 (pPIC9K-AS) after 4 d of induction or 5 d of culture is only 70% of that expressed by P. pastoris GS115 (pGAP9K-AS). The AS expression in inducible system reached the peak after 6 d of induction but the expressed AS was only 86% of that from constitutive system. The results of anti-angiogenic and antitumor activity assay showed that AS expressed from both constitutive and inducible system inhibited the CAM angiogenesis and suppressed B16 melanoma in C57BL/6J mouse and that the tumor inhibition rates reached 90.63% and 90.54%, respectively. The above data indicates that the constitutive promoter P(GAP) can served as an effective alternative to the inductive promoter P(AOX1) to express AS and other proteins in P. pastoris.
Zhang
Ai-Lian
AL
The Key Laboratory of Gene Engineering of Ministry of Education, Department of Biochemistry, Zhongshan University, Guangzhou 510275, China.
Luo
Jin-Xian
JX
Zhang
Tian-Yuan
TY
Chen
Shou-Cai
SC
Guan
Wen-Jun
WJ
D020533:Angiogenesis Inhibitors / Q000494:pharmacology; D043168:Angiostatins / Q000096:biosynthesis / Q000235:genetics* / Q000494:pharmacology; D000818:Animals; D001483:Base Sequence; D002642:Chick Embryo; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000235:genetics*; D006801:Humans; D008297:Male; D008546:Melanoma, Experimental / Q000188:drug therapy; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D010843:Pichia / Q000235:genetics*; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000096:biosynthesis* / Q000494:pharmacology; D017422:Sequence Analysis, DNA
D020533:Angiogenesis Inhibitors; D011994:Recombinant Proteins; D043168:Angiostatins; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases