Glucosylation of
Man9GlcNAc2-P-P-dolichol in vivo depends upon
the level of expression of Lec35 mRNA. CHO-K1 (A and B), Lec 35.1 (C
and D), 6C (E and F), or 10A cells (G and H) were grown in the absence
(A, C, E, and G) or presence (B, D, F, and H) of 10 ng/ml doxycyclin
for 4 d, and labeled with 1 mCi/ml
[2-3H]mannose for 15 min. Oligosaccharides were
obtained from the LLO fraction by mild acid hydrolysis and analyzed by
HPLC.