1BTN

STRUCTURE OF THE BINDING SITE FOR INOSITOL PHOSPHATES IN A PH DOMAIN

1BTN の概要

• エントリーDOI: 10.2210/pdb1btn/pdb
• 分子名称: BETA-SPECTRIN, D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE (3 entities in total)
• 機能のキーワード: signal transduction protein
• 由来する生物種: Mus musculus (house mouse)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 12707.95

構造登録者

Wilmanns, M.,Hyvoenen, M.,Saraste, M. (登録日: 1995-08-23, 公開日: 1996-03-08, 最終更新日: 2024-02-07)

主引用文献

Hyvonen, M.,Macias, M.J.,Nilges, M.,Oschkinat, H.,Saraste, M.,Wilmanns, M.
Structure of the binding site for inositol phosphates in a PH domain.
EMBO J., 14:4676-4685, 1995

PubMed Abstract: Phosphatidylinositol bisphosphate has been found to bind specifically to pleckstrin homology (PH) domains that are commonly present in signalling proteins but also found in cytoskeleton. We have studied the complexes of the beta-spectrin PH domain and soluble inositol phosphates using both circular dichroism and nuclear magnetic resonance spectroscopy, and X-ray crystallography. The specific binding site is located in the centre of a positively charged surface patch of the domain. The presence of 4,5-bisphosphate group on the inositol ring is critical for binding. In the crystal structure that has been determined at 2.0 A resolution, inositol-1,4,5-trisphosphate is bound with salt bridges and hydrogen bonds through these phosphate groups whereas the 1-phosphate group is mostly solvent-exposed and the inositol ring has virtually no interactions with the protein. We propose a model in which PH domains are involved in reversible anchoring of proteins to membranes via their specific binding to phosphoinositides. They could also participate in a response to a second messenger such as inositol trisphosphate, organizing cross-roads in cellular signalling.

PubMed: 7588597

実験手法

X-RAY DIFFRACTION (2 Å)