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Thr~ structural features of yeast phenylalanine transfer RNA are analyzed and documented in detail, based on atomic coordinates obtained from an extensive crystallographic refinement of t,he crystal structure of the molecule at 2.7 A resolution (see preceding paper). We describe here: the relative orientation and the helicity of the base-paired stems; more(More)
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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