49 results about "DNA binding site" patented technology

The invention provides a method for selecting, from a repertoire of polypeptides, a population of functional polypeptides which bind a target ligand in a first binding site and a generic ligand in a second binding site, which generic ligand is capable of binding functional members of the repertoire regardless of target ligand specificity, comprising the steps of: a) contacting the repertoire with the generic ligand and selecting functional polypeptides bound thereto; and b) contacting the selected functional polypeptides with the target ligand and selecting a population of polypeptides which bind to the target ligand. The invention accordingly provides a method by which a polypeptide repertoire is preselected, according to functionality as determined by the ability to bind the generic ligand, and the subset of polypeptides obtained as a result of such preselection is then employed for further selection according to the ability to bind the target ligand.

Modified E1a regulatory sequences are provided, wherein at least one Pea3 binding site, or a functional portion thereof, is deleted. Also provided are modified E1a sequences that selectively express particular isoforms. Also provided is an E1b-19K clone insertion site. These modified sequences can be used individually, or in combination with one another, to provide tumor-selective expression of proteins.

The invention relates to the identification of biologically-active DNA-binding sites to which a protein of interest binds in a cell. The invention also relates to the identification of agents and conditions which alter the biologically-active DNA-binding sites to which a protein binds. One aspect of the invention also provides methods for identifying pathways that are regulated by transcriptional regulators and for modulating the activity of the pathways.

Receptor recognition factors exist that recognizes the specific cell receptor to which a specific ligand has been bound, and that may thereby signal and / or initiate the binding of the transcription factor to the DNA site. The receptor recognition factor is in one instance, a part of a transcription factor, and also may interact with other transcription factors to cause them to activate and travel to the nucleus for DNA binding. The receptor recognition factor appears to be second-messenger-independent in its activity, as overt perturbations in second messenger concentrations are of no effect. The concept of the invention is illustrated by the results of studies conducted With interferon (IFN)-stimulated gene transcription, and particularly, the activation caused by both IFNα and IFNγ. Specific DNA and amino acid sequences for various human and murine receptor recognition factors are provided, as are polypeptide fragments of two of the ISGF-3 genes, and antibodies have also been prepared and tested. The polypeptides confirm direct involvement of tyrosine kinase in intracellular message transmission. Numerous diagnostic and therapeutic materials and utilities are also disclosed.

The transcription factor and tumor suppressor protein p53 is inactivated in many human cancers. Approximately forty percent of cancers carry large amounts of mutated full-length p53 protein with one of over 900 reported single amino acid changes in the p53 core domain that recognizes p53 DNA binding sites. The ability to restore function to these inactive p53 proteins would dramatically improve cancer therapy. Alternative open reading frames that are more easily engineered encode a wild-type p53. The alternative open reading frames are optimized for codon usage and expression of p53 proteins in E. coli, yeast and mammalian cells. The alternative open reading frames may additionally contain mutations that are naturally found in human cancers, substitutions that correspond to polymorphic p53 alleles, or mutations in residues that can be post-translationally modified.