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J. Biol. Chem., Vol. 276, Issue 21, 18265-18271, May 25, 2001
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From Genesis Research and Development Corporation Limited,
P. O. Box 50, Auckland 1015, New Zealand and
§ Genometrix Incorporated, The Woodlands, Texas 77381
High throughput sequencing of a mouse
keratinocyte library was used to identify an expressed sequence tag
with homology to the epidermal growth factor (EGF) family of growth
factors. We have named the protein encoded by this expressed sequence
tag Epigen, for epithelial mitogen. Epigen encodes a protein of 152 amino acids that contains features characteristic of the EGF
superfamily. Two hydrophobic regions, corresponding to a putative
signal sequence and transmembrane domain, flank a core of amino acids
encompassing six cysteine residues and two putative
N-linked glycosylation sites. Epigen shows 24-37%
identity to members of the EGF superfamily including EGF,
transforming growth factor The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AJ291391.
Cloning and Biological Activity of Epigen, a Novel Member of the
Epidermal Growth Factor Superfamily*
,
, and Epiregulin. Northern blotting of several adult mouse tissues indicated that Epigen was
present in testis, heart, and liver. Recombinant Epigen was synthesized
in Escherichia coli and refolded, and its biological activity was compared with that of EGF and transforming growth factor
in several assays. In epithelial cells, Epigen stimulated the
phosphorylation of c-erbB-1 and mitogen-activated protein kinases and also activated a reporter gene containing enhancer sequences present in the c-fos promoter. Epigen also
stimulated the proliferation of HaCaT cells, and this
proliferation was blocked by an antibody to the extracellular domain of
the receptor tyrosine kinase c-erbB-1. Thus, Epigen is
the newest member of the EGF superfamily and, with its ability to
promote the growth of epithelial cells, may constitute a novel
molecular target for wound-healing therapy.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.: 64-9-373-5600;
Fax: 64-9-373-2189; E-mail: l.strachan@genesis.co.nz.
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