6BVZ

Importin alpha 3 in cargo free state

Summary for 6BVZ

• Entry DOI: 10.2210/pdb6bvz/pdb
• Related: 6BVT 6BVV
• Descriptor: Importin subunit alpha-3 (2 entities in total)
• Functional Keywords: importin, karyopherin, nuclear transport, transport protein
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 1
• Total formula weight: 50325.81

Authors

Smith, K.M.,Tsimbalyuk, S.,Edwards, M.R.,Aragao, D.,Cross, E.M.,Basler, C.F.,Forwood, J.K. (deposition date: 2017-12-14, release date: 2018-07-04, Last modification date: 2024-05-22)

Primary citation

Smith, K.M.,Tsimbalyuk, S.,Edwards, M.R.,Cross, E.M.,Batra, J.,Soares da Costa, T.P.,Aragao, D.,Basler, C.F.,Forwood, J.K.
Structural basis for importin alpha 3 specificity of W proteins in Hendra and Nipah viruses.
Nat Commun, 9:3703-3703, 2018

PubMed Abstract: Seven human isoforms of importin α mediate nuclear import of cargo in a tissue- and isoform-specific manner. How nuclear import adaptors differentially interact with cargo harbouring the same nuclear localisation signal (NLS) remains poorly understood, as the NLS recognition region is highly conserved. Here, we provide a structural basis for the nuclear import specificity of W proteins in Hendra and Nipah viruses. We determine the structural interfaces of these cargo bound to importin α1 and α3, identifying a 2.4-fold more extensive interface and > 50-fold higher binding affinity for importin α3. Through the design of importin α1 and α3 chimeric and mutant proteins, together with structures of cargo-free importin α1 and α3 isoforms, we establish that the molecular basis of specificity resides in the differential positioning of the armadillo repeats 7 and 8. Overall, our study provides mechanistic insights into a range of important nucleocytoplasmic transport processes reliant on isoform adaptor specificity.

PubMed: 30209309
DOI: 10.1038/s41467-018-05928-5

Experimental method

X-RAY DIFFRACTION (2.3 Å)