Inventors:
David L. Levens - Bethesda MD
Robert C. Duncan - Mt. Rainer MD
Mark I. Avigan - Silver Spring MD
Assignee:
The United States of America as represented by the Department of Health
and Human Services - Washington DC
International Classification:
C12P 1934, C07H 2104, C12N 510, C12N 1563
Abstract:
The Far Upstream Element (FUSE) of the human c-myc gene, stimulates expression in undifferentiated cells. A FUSE binding protein (FBP), also referred to as DROME (DNA-binding regulator of c-myc expression), is active in undifferentiated but not differentiated cell extracts. Cloned FBP exhibits the same DNA-binding specificity as the purified human protein and can trans-activate in a FUSE dependent manner. Sequence-specific binding to the FUSE oligonucleotide required at least two copies of a repeat-helix unit which defines a new DNA-binding motif. Expression of FBP mRNA declined in parallel with decreased FUSE binding activity upon differentiation suggesting transcriptional regulation of FBP. Features were identified in clones which suggested FBP is also regulated by RNA processing, translation and post-translational mechanisms.