Xd. Fang et al., The interaction of the calcium- and integrin-binding protein (CIBP) with the coagulation factor VIII, THROMB RES, 102(2), 2001, pp. 177-185
The gene encoding the C-terminal part of A1-domain of human blood coagulati
on factor VIII (FVIII), a 110-amino acid fragment from Ala(227) to Arg(336)
, namely A1(Delta1-226), was cloned and used as a 'bait' to screen a protei
n, which might interact with this region by using the yeast two-hybrid syst
em. A gene coding for a related protein of FVIII named calcium- and integri
nbinding protein (CIBP) was isolated from the normal human liver cDNA libra
ry. The results were confirmed by using the mammalian two-hybrid system and
coimmunoprecipitation. The gene coding for CIBP was constructed by polymer
ase chain reaction (PCR) and then cotransfected with the B-domain-deleted F
VIII gene into mammalian cell lines using the expression vector of FVIII fo
r transient or stable expression. The culture supernatant was collected and
analyzed both by enzyme-linked immunosorbent assay (ELISA) for FVIII antig
en level and by one-stage method for procoagulant activity. Coexpressed wit
h CIBP, the antigen level df FVIII in the mammalian cell line baby hamster
kidney (BHK) cells increased up to about 170% and its bioactivity rose acco
rdingly. (C) 2001 Elsevier Science Ltd. All rights reserved.