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. 1988 Dec 9;16(23):11047–11056. doi: 10.1093/nar/16.23.11047

A distinct octamer-binding protein present in malignant melanoma cells.

P M Cox 1, S M Temperley 1, H Kumar 1, C R Goding 1
PMCID: PMC338995  PMID: 3264609

Abstract

The octamer-binding proteins present in HeLa cells, B-cells and malignant melanoma cells were compared by a gel-electrophoresis DNA-binding assay. Using an extract from the malignant melanoma cells a complex was formed using a variety of octamer containing probes that was distinct from those found using either a HeLa or B-cell extract. DNAase 1 footprints and methylation interference patterns of the melanoma-specific octamer-binding protein were indistinguishable from those obtained with the HeLa factor NF-A1, except for preferential binding of the melanoma-specific factor to DNA methylated at two G residues 16 base-pairs 3' to the octamer motif. Competition analyses using a variety of wild-type and mutant probes showed that mutations affecting binding of NF-A1 similarly affected binding of the melanoma octamer-binding factor. These data also revealed the extreme flexibility of the octamer-binding site, with one probe sharing only 4 bases with the 8 base consensus sequence binding efficiently.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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