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Mediator, the multisubunit complex that plays an essential role in the regulation of transcription initiation in all eukaryotes, was isolated using an affinity purification protocol that yields pure material suitable for structural analysis. Conformational sorting of yeast Mediator single-particle images characterized the inherent flexibility of the complex and made possible calculation of a cryo-EM...
Transportin 1 (Trn1) is a transport receptor that transports substrates from the cytoplasm to the nucleus through nuclear pore complexes by recognizing nuclear localization signals (NLSs). Here we describe four crystal structures of human Trn1 in a substrate-free form as well as in the complex with three NLSs (hnRNP D, JKTBP, and TAP, respectively). Our data have revealed that (1) Trn1 has two sites...
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