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Site-Specific Protein-DNA Photo-Cross-Linking: Analysis of Structural Organization of Protein-DNA - http://www.cshprotocols.org/cgi/content/abstract/2006/29/pdb.prot4588

Category: DNA Protein Interactions Protocols

The multiprotein-DNA complex of interest is formed using the site-specifically derivatized DNA fragment. The complex is then UV-irradiated, initiating covalent cross-linking with proteins in direct physical proximity to the cross-linking agent. Extensive nuclease digestion is performed to eliminate uncross-linked DNA and convert cross-linked DNA to a cross-linked, radiolabeled nucleotide "tag." - [Read Site-Specific Protein-DNA Photo-Cross-Linking: Analysis of Structural Organization of Protein-DNA]

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Absorption Spectroscopy and Quantification of Filamentous Phage Protocol

Unlike spherical phage, such as T4 and λ, which have roughly equal weight ratios of protein to DNA, filamentous phage have about six times more protein than DNA; the protein therefore contributes substantially to the absorption spectrum.