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描述:
The disulfide linked homodimeric proteins vascular endothelial growth factor (VEGF) and
placenta growth factor (PlGF) are both members of the VEGF family of growth factors. VEGF
and PlGF proteins share primary structural as well as limited amino acid sequence homology
with the A and B chains of PDGF. All eight cysteine residues involved in intra- and inter-chain
disulfides are conserved among these growth factors. In their PDGF-like regions, VEGF and PlGF
also share approximately 53% amino acid sequence similarity. E. coli-expressed monomers of
PlGF and VEGF can be refolded in vitro to form PlGF/VEGF heterodimers. The purified
recombinant VEGF/PlGF heterodimers and VEGF homodimers have potent mitogenic effects
on endothelial cells. However, VEGF/PlGF heterodimers display approximately 50fold less
mitogenic activity than VEGF homodimers. In contrast, PlGF homodimers have little or no
mitogenic effect on endothelial cells. The presence of natural VEGF/PlGF heterodimers in the
conditioned media of a number of human tumor cell lines has been demonstrated using a
VEGF/PlGF heterodimer specific ELISA.
原厂资料:
The disulfide linked homodimeric proteins vascular endothelial growth factor (VEGF) and
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