4ZH9

Crystal Structure of the Domain-Swapped Dimer Wild-Type of Human Cellular Retinol Binding Protein II

4ZH9 の概要

• エントリーDOI: 10.2210/pdb4zh9/pdb
• 関連するPDBエントリー: 4QYN 4QYP 4QZT 4QZU 4ZH6
• 分子名称: Retinol-binding protein 2 (2 entities in total)
• 機能のキーワード: domain swapped dimer, domain swapping, protein folding, human cellular retinol binding protein ii, intra cellular retinol binding protein ii, transport protein
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 15597.45

構造登録者

Assar, Z.,Nossoni, Z.,Geiger, J.H. (登録日: 2015-04-24, 公開日: 2016-06-08, 最終更新日: 2023-09-27)

主引用文献

Assar, Z.,Nossoni, Z.,Wang, W.,Santos, E.M.,Kramer, K.,McCornack, C.,Vasileiou, C.,Borhan, B.,Geiger, J.H.
Domain-Swapped Dimers of Intracellular Lipid-Binding Proteins: Evidence for Ordered Folding Intermediates.
Structure, 24:1590-1598, 2016

PubMed Abstract: Human Cellular Retinol Binding Protein II (hCRBPII), a member of the intracellular lipid-binding protein family, is a monomeric protein responsible for the intracellular transport of retinol and retinal. Herein we report that hCRBPII forms an extensive domain-swapped dimer during bacterial expression. The domain-swapped region encompasses almost half of the protein. The dimer represents a novel structural architecture with the mouths of the two binding cavities facing each other, producing a new binding cavity that spans the length of the protein complex. Although wild-type hCRBPII forms the dimer, the propensity for dimerization can be substantially increased via mutation at Tyr60. The monomeric form of the wild-type protein represents the thermodynamically more stable species, making the domain-swapped dimer a kinetically trapped entity. Hypothetically, the wild-type protein has evolved to minimize dimerization of the folding intermediate through a critical hydrogen bond (Tyr60-Glu72) that disfavors the dimeric form.

PubMed: 27524203
DOI: 10.1016/j.str.2016.05.022

実験手法

X-RAY DIFFRACTION (2.66 Å)