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We present the results of the Jimal stage of the X-ray crystallographic studies of yeast phenylalanine transfer RNA in an orthorhombic crystal form. The crystal structure of the transfer KNA has been refined by a least-squares procedure to minimize the difference between the observed (F,) and calculated (F',) structure factors from X-ray diffraction(More)
Single crystal X-ray diffraction and circular dichroism studies of protamine binding to a tRNA suggest that the protamine molecule changes its conformation from a random coil to a structure containing a helices on binding to tRNA, and that alpha-helical segment(s) of protamine bind approximately along a shallow groove of a double-helical portion of ttrna.(More)
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