Structural evidence that endothelial cell growth factor beta is the precursor of both endothelial cell growth factor alpha and acidic fibroblast growth factor.

Abstract
Two endothelial cell growth factors (ECGF) have been purified from bovine brain and termed .alpha.- and .beta.-ECGF [Burgess, W.H., Mehlman, T., Friesel, R., Johnson, W. V. and Maciag, T. (1985) J. Biol. Chem. 260, 11389-11392]. Amino acid sequence analysis indicates that .beta.-ECGF represents a 20-amino acid amino-terminal extension of .alpha.-ECGF and a 14 amino acid amino-terminal extension of acidic fibroblast growth factor. These data indicate that both .alpha.-ECGF and acidic fibroblast growth factor may be derived from .beta.-ECGF by posttranslational processing. Analysis of the amino-terminal 14 residues of .beta.-ECGF by fast-atom-bombardment mass spectrometry established the amino acid sequence of this region and the identity of the blocking group at the amino terminus (acetyl).