Jn. Andersen et al., EFFECT OF TEMPERATURE ON RECOMBINANT PROTEIN-PRODUCTION USING THE BM5BM5.NPV EXPRESSION SYSTEM/, Canadian journal of chemical engineering, 74(4), 1996, pp. 511-517
A series of experiments have been conducted using a recombinant baculo
virus/insect cell expression system (Bm5/BmS.NPV.CAT) to establish the
optimum temperature for both cell growth and virus infection. Bm5 cel
l growth was found to be limited at temperatures below 22 degrees C an
d ceased completely at temperatures above 34 degrees C. In the range b
etween 24 and 28 degrees C, final cell densities always reached 96% of
the highest achievable viable cell density. The shortest population d
oubling time was obtained at 28 degrees C. Overall, a consistent incre
ase in metabolism with increasing temperatures was observed. During th
e infection/viral replication phase, an increase in the temperature fr
om 25 to 31 degrees C resulted in a faster decrease in viable cell den
sity and an earlier production of chloramphenicol acetyltransferase (C
AT). Furthermore, protein yield at temperatures above 28 degrees C was
significantly reduced. Overall, the best temperature for the infectio
n phase for the Bm5/Bm5.NPV expression system was found to be 25 degre
es C when the cells are cultured in serum free media.