HDGF

This gene encodes a member of the hepatoma-derived growth factor family. The encoded protein has mitogenic and DNA-binding activity and may play a role in cellular proliferation and differentiation. High levels of expression of this gene enhance the growth of many tumors. This gene was thought initially to be located on chromosome X; however, that location has been determined to correspond to a related pseudogene. Alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jan 2016]

Heparin Binding Growth Factor

Isoform 1:
Acts as a transcriptional repressor (PubMed:17974029).

Has mitogenic activity for fibroblasts (PubMed:11751870, PubMed:26845719).

Heparin-binding protein (PubMed:15491618).

Isoform 2:
Does not have mitogenic activity for fibroblasts (PubMed:26845719).

Does not bind heparin (PubMed:26845719).

Isoform 3:
Has mitogenic activity for fibroblasts (PubMed:26845719).

Heparin-binding protein (PubMed:26845719).

Cellular response to interleukin-7 Source: Ensembl
Negative regulation of neuron apoptotic process Source: Ensembl
Negative regulation of transcription by RNA polymerase II Source: BHF-UCL
Positive regulation of cell division Source: UniProtKB
Positive regulation of transcription by RNA polymerase II Source: Ensembl
Protein localization to nucleus Source: Ensembl
Regulation of transcription by RNA polymerase II Source: GO_Central
Signal transduction Source: ProtInc

Isoform 1: Nucleus; Extracellular exosome; Cytoplasm. Secreted by exosomes and is located inside the exosome (PubMed:27926477). May also be secreted as free protein via an as yet unknown pathway (PubMed:27926477).
Isoform 2: Nucleus; Extracellular exosome; Cytoplasm. Secreted by exosomes and is located on the outer exosome surface.
Isoform 3: Nucleus; Extracellular exosome; Cytoplasm. Secreted by exosomes and is located on the outer exosome surface.

Sumoylated with SUMO1. Sumoylation prevents binding to chromatin.
Phosphorylation at Ser-165 is likely to be required for secretion.