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Optical tweezers are employed to study the action of the histone-like protein from Thermotoga maritima (TmHU) on DNA at a single molecule level. Binding and disruption of TmHU to and from DNA are found to take place in discrete steps of 4–5nm length and a net binding enthalpy of about 16k B T. This is in reasonable agreement with a microscopic model that estimates the extension of the binding...
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