4Z2P

Crystal structure of short hoefavidin-hoef-peptide(L9F) complex

4Z2P の概要

• エントリーDOI: 10.2210/pdb4z2p/pdb
• 関連するPDBエントリー: 4Z27 4Z28 4Z2O
• 分子名称: Avidin family, Hoef-peptide (L9F) (3 entities in total)
• 機能のキーワード: protein binding, high affinity system, bacterial avidins, biotin binding protein
• 由来する生物種: Hoeflea phototrophica DFL-43; 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 31221.73

構造登録者

Livnah, O.,Avraham, O. (登録日: 2015-03-30, 公開日: 2015-07-15, 最終更新日: 2024-10-23)

主引用文献

Avraham, O.,Meir, A.,Fish, A.,Bayer, E.A.,Livnah, O.
Hoefavidin: A dimeric bacterial avidin with a C-terminal binding tail.
J.Struct.Biol., 191:139-148, 2015

PubMed Abstract: Dimeric avidins are a newly discovered subgroup of the avidin family that bind biotin with high affinity. Their dimeric configuration is a quaternary substructure of the classical tetrameric avidins which lacks the requirement of the critical Trp that defines the tetramer and dictates the tenacious interaction with biotin. Hoefavidin, derived from the bacterium Hoeflea phototrophica DFL-43(T), is the third characterized member of the dimeric avidin subfamily. Like the other members of this group, hoefavidin is a thermostable protein that contains a disulfide bridge between Cys57 and Cys88, thereby connecting and stabilizing the L3,4 and L5,6 loops. This represents a distinctive characteristic of dimeric avidins that compensates for the lack of Trp and enables their dimeric configuration. The X-ray structure of the intact hoefavidin revealed unique crystal packing generated by an octameric cylindrical structure wherein the C-termini segments of each monomer is introduced into the entrance of the biotin-binding site of an adjacent non-canonical monomer. This anomaly in the protein structure served as a lead toward the design of specific binding peptides. We screened for specific hoefavidin binding peptides derived from the C-terminal region and two peptides were obtained that bind a truncated form of hoefavidin (lacking the last 10 amino acids) with dissociation constants of 10(-5)M. The crystal structure of short hoefavidin complexed with a C-terminal derived peptide revealed the mode of binding. These peptides may form the basis of novel and reversible binders for dimeric avidins.

PubMed: 26126731
DOI: 10.1016/j.jsb.2015.06.020

実験手法

X-RAY DIFFRACTION (1.6 Å)