Protein MC1 is the major chromosomal protein in methanosarcinaceae. Using photochemical crosslinking on 5-bromouracil-substituted DNA, we identified the region of the protein that interacts with it. This region is located in the C-terminal part of the polypeptide chain, and the crosslinked amino-acids are in the region 74-86. Tryptophan 74 is one of the amino-acids crosslinked to DNA.
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Laine et al. (1991) studied this question.
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