3nd2 | pdb_00003nd2
Structure of Yeast Importin-beta (Kap95p)
Structural highlights
FunctionIMB1_YEAST Required for nuclear protein import and mediates docking of import substrate to distinct nucleoporins. Serves a receptor for nuclear localization signals. Mediates the nuclear import of histones H2A and H2B.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe structure of solenoid proteins facilitates a higher degree of flexibility than most folded proteins. In importin-beta, a nuclear import factor built from 19 tandem HEAT repeats, flexibility plays a crucial role in allowing interactions with a range of different partners. We present a comprehensive analysis of importin-beta flexibility based on a number of different approaches. We determined the crystal structure of unliganded Saccharomyces cerevisiae importin-beta (Kap95) to allow a quantitative comparison with importin-beta bound to different partners. Complementary mutagenesis, small angle X-ray scattering and molecular dynamics studies suggest that the protein samples several conformations in solution. The analyses suggest the flexibility of the solenoid is generated by cumulative small movements along its length. Importin-beta illustrates how solenoid proteins can orchestrate protein interactions in many cellular pathways. Quantitative structural analysis of importin-beta flexibility: paradigm for solenoid protein structures.,Forwood JK, Lange A, Zachariae U, Marfori M, Preast C, Grubmuller H, Stewart M, Corbett AH, Kobe B Structure. 2010 Sep 8;18(9):1171-83. PMID:20826343[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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