[The effect of induction temperature on aggregation of consensus interferon-alpha expressed by Pichia pastoris].
The effect of induction temperature on aggregation of consensus interferon-alpha expressed by Pichia pastoris was investigated. The cell growth and cIFN level were analyzed and compared when Pichia pastoris was grown at 30,25,20 degrees C during induction phase, using 5.0L fermentor. The result suggested that the cell growth was not affected much under the different induction temperature, but the protein level declined markedly with the decrease of the induction temperature. The total protein ammount induced at 20 degrees C was 67.8 percent of that at 30 degrees C. SDS-PAGE and native-PAGE as well as Western blotting analysis were further conducted. The electrophoresis results revealed that cIFN formed aggregates after secreted into media when protein was induced at 30 degrees C but this problem can be restored by decreasing the induction temperature to 20 degrees C. cIFN monomer in supernatant arrived at 570mg/L and bioactivity of fermentation broth reached 1.05 x 10(9) IU/mL at 20 degrees C of induction temperature. The amount of cIFN monomer and bioactivity in supernatant elevated 7.2 and 38.7 times, respectively, when the induction temperature was controlled at 20 degrees C instead of conventional 30 degrees C.
Shi
Qi-Qi
QQ
State Key Laboratory Engineering, East China University of Science and Technology, Shanghai 200237, China.
Hao
Yu-You
YY
Wu
Kang-Hua
KH
Chu
Ju
J
Zhuang
Ying-Pingi
YP
Zhang
Si-Liang
SL
D005285:Fermentation; D006801:Humans; D007370:Interferon Type I / Q000096:biosynthesis* / Q000235:genetics; D016898:Interferon-alpha; D010843:Pichia / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D011994:Recombinant Proteins / Q000096:biosynthesis* / Q000235:genetics; D013696:Temperature
D007370:Interferon Type I; D016898:Interferon-alpha; D011994:Recombinant Proteins; C050739:interferon alfacon-1