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Functionally required conformational plasticity of transmembrane proteins implies that specific structural motifs have been integrated in transmembrane helices. Surveying a database of transmembrane helices and the large family of G-protein coupled receptors we identified a series of overrepresented motifs associating Pro with either Ser or Thr. Thus, we have studied the conformation of Pro-kinked...
One of the common mechanisms of DNA bending by minor groove-binding proteins is the insertion of protein side chains between basepair steps, exemplified in TBP (TATA box-binding protein)/DNA complexes. At the central basepair step of the TATA box TBP produces a noticeable decrease in twist and an increase in roll, while engaging in hydrogen bonds with the bases and sugars. This suggests a mechanism...
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