1EJL

MOUSE IMPORTIN ALPHA-SV40 LARGE T ANTIGEN NLS PEPTIDE COMPLEX

Summary for 1EJL

• Entry DOI: 10.2210/pdb1ejl/pdb
• Related: 1BK6 1EJY 1IAL
• Descriptor: SV40 LARGE T ANTIGEN NLS PEPTIDE, IMPORTIN ALPHA (2 entities in total)
• Functional Keywords: importin alpha/karyopherin alpha; nuclear localization sequence (nls) recognition; simian virus (sv40) large t-antigen, protein binding
• Biological source: Mus musculus (house mouse); More
• Cellular location: Host nucleus: P03070; Cytoplasm (By similarity): P52293
• Total number of polymer chains: 3
• Total formula weight: 51662.98

Authors

Fontes, M.R.,Teh, T.,Kobe, B. (deposition date: 2000-03-03, release date: 2000-04-24, Last modification date: 2024-02-07)

Primary citation

Fontes, M.R.,Teh, T.,Kobe, B.
Structural basis of recognition of monopartite and bipartite nuclear localization sequences by mammalian importin-alpha.
J.Mol.Biol., 297:1183-1194, 2000

PubMed Abstract: Importin-alpha is the nuclear import receptor that recognizes cargo proteins which contain classical monopartite and bipartite nuclear localization sequences (NLSs), and facilitates their transport into the nucleus. To determine the structural basis of the recognition of the two classes of NLSs by mammalian importin-alpha, we co-crystallized an N-terminally truncated mouse receptor protein with peptides corresponding to the monopartite NLS from the simian virus 40 (SV40) large T-antigen, and the bipartite NLS from nucleoplasmin. We show that the monopartite SV40 large T-antigen NLS binds to two binding sites on the receptor, similar to what was observed in yeast importin-alpha. The nucleoplasmin NLS-importin-alpha complex shows, for the first time, the mode of binding of bipartite NLSs to the receptor. The two basic clusters in the NLS occupy the two binding sites used by the monopartite NLS, while the sequence linking the two basic clusters is poorly ordered, consistent with its tolerance to mutations. The structures explain the structural basis for binding of diverse NLSs to the sole receptor protein.

PubMed: 10764582
DOI: 10.1006/jmbi.2000.3642

Experimental method

X-RAY DIFFRACTION (2.8 Å)