A multiplicity of CCAAT box-binding proteins - PubMed (original) (raw)
Comparative Study
A multiplicity of CCAAT box-binding proteins
A Dorn et al. Cell. 1987.
Abstract
NF-Y is a sequence-specific DNA-binding protein that recognizes the Y box, a promoter element common to all major histocompatibility complex class II genes. Since the 14-base Y element harbors a CCAAT box in reverse, we were prompted to ask whether NF-Y is actually a CCAAT box-binding protein and whether it is related to the previously described CCAAT-binding factors CBP and CTF/NF-I. Data from gel retardation, methylation interference, saturation mutagenesis, and cross-competition experiments establish definitively that NF-Y is an entirely distinct CCAAT box-binding entity. Moreover, these experiments have uncovered a fourth CCAAT-binding protein, NF-Y(star) that interacts with the thymidine kinase promoter. Clearly, then, there exists a multiplicity of factors that recognize CCAAT sequences; it now becomes imperative to understand the functional significance of this multiplicity.
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