5WUN

Crystal structure of mouse importin-alpha1 bound to non-phosphorylated NLS of EBNA1

5WUN の概要

• エントリーDOI: 10.2210/pdb5wun/pdb
• 関連するPDBエントリー: 5WUM
• 分子名称: Importin subunit alpha-1, Epstein-Barr nuclear antigen 1 (3 entities in total)
• 機能のキーワード: importin, nuclear localization signal, nuclear import, protein transport-peptide complex, protein transport/peptide
• 由来する生物種: Mus musculus (Mouse); 詳細
• 細胞内の位置: Cytoplasm : P52293; Host nucleus : P03211
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 51978.95

構造登録者

Nakada, R.,Hirano, H.,Matsuura, Y. (登録日: 2016-12-19, 公開日: 2017-01-25, 最終更新日: 2023-11-22)

主引用文献

Nakada, R.,Hirano, H.,Matsuura, Y.
Structural basis for the regulation of nuclear import of Epstein-Barr virus nuclear antigen 1 (EBNA1) by phosphorylation of the nuclear localization signal.
Biochem. Biophys. Res. Commun., 484:113-117, 2017

PubMed Abstract: Epstein-Barr virus (EBV) nuclear antigen 1 (EBNA1) is expressed in every EBV-positive tumor and is essential for the maintenance, replication, and transcription of the EBV genome in the nucleus of host cells. EBNA1 is a serine phosphoprotein, and it has been shown that phosphorylation of S385 in the nuclear localization signal (NLS) of EBNA1 increases the binding affinity to the nuclear import adaptor importin-α1 as well as importin-α5, and stimulates nuclear import of EBNA1. To gain insights into how phosphorylation of the EBNA1 NLS regulates nuclear import, we have determined the crystal structures of two peptide complexes of importin-α1: one with S385-phosphorylated EBNA1 NLS peptide, determined at 2.0 Å resolution, and one with non-phosphorylated EBNA1 NLS peptide, determined at 2.2 Å resolution. The structures show that EBNA1 NLS binds to the major and minor NLS-binding sites of importin-α1, and indicate that the binding affinity of the EBNA1 NLS to the minor NLS-binding site could be enhanced by phosphorylation of S385 through electrostatic interaction between the phosphate group of phospho-S385 and K392 of importin-α1 (corresponding to R395 of importin-α5) on armadillo repeat 8.

PubMed: 28104399
DOI: 10.1016/j.bbrc.2017.01.063

実験手法

X-RAY DIFFRACTION (2.2 Å)