- PDB-5zfu: Structure of the ExbB/ExbD hexameric complex (ExbB6ExbD3TM) -
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基本情報
登録情報
データベース: PDB / ID: 5zfu
タイトル
Structure of the ExbB/ExbD hexameric complex (ExbB6ExbD3TM)
要素
22-mer peptide from Biopolymer transport protein ExbD
Biopolymer transport protein ExbB
キーワード
TRANSPORT PROTEIN / Ton system / ion channel / energizer / transporter / proton motive force
機能・相同性
機能・相同性情報
ferrichrome import into cell / energy transducer activity / bacteriocin transport / cobalamin transport / intracellular monoatomic cation homeostasis / transmembrane transporter complex / plasma membrane protein complex / protein import / transmembrane transporter activity / cell outer membrane ...ferrichrome import into cell / energy transducer activity / bacteriocin transport / cobalamin transport / intracellular monoatomic cation homeostasis / transmembrane transporter complex / plasma membrane protein complex / protein import / transmembrane transporter activity / cell outer membrane / protein transport / intracellular iron ion homeostasis / protein stabilization / protein homodimerization activity / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能
TonB-system energizer ExbB type-1 / TonB system transport protein ExbD type-1 / : / Biopolymer transport protein ExbD/TolR / Biopolymer transport protein ExbD/TolR / MotA/TolQ/ExbB proton channel / MotA/TolQ/ExbB proton channel family 類似検索 - ドメイン・相同性
Biopolymer transport protein ExbB / Biopolymer transport protein ExbD 類似検索 - 構成要素
the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research
15K06986
日本
the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research
16H04757
日本
引用
ジャーナル: Elife / 年: 2018 タイトル: Hexameric and pentameric complexes of the ExbBD energizer in the Ton system. 著者: Saori Maki-Yonekura / Rei Matsuoka / Yoshiki Yamashita / Hirofumi Shimizu / Maiko Tanaka / Fumie Iwabuki / Koji Yonekura / 要旨: Gram-negative bacteria import essential nutrients such as iron and vitamin B through outer membrane receptors. This process utilizes proton motive force harvested by the Ton system made up of three ...Gram-negative bacteria import essential nutrients such as iron and vitamin B through outer membrane receptors. This process utilizes proton motive force harvested by the Ton system made up of three inner membrane proteins, ExbB, ExbD and TonB. ExbB and ExbD form the proton channel that energizes uptake through TonB. Recently, crystal structures suggest that the ExbB pentamer is the scaffold. Here, we present structures of hexameric complexes of ExbB and ExbD revealed by X-ray crystallography and single particle cryo-EM. Image analysis shows that hexameric and pentameric complexes coexist, with the proportion of hexamer increasing with pH. Channel current measurement and 2D crystallography support the existence and transition of the two oligomeric states in membranes. The hexameric complex consists of six ExbB subunits and three ExbD transmembrane helices enclosed within the central channel. We propose models for activation/inactivation associated with hexamer and pentamer formation and utilization of proton motive force.
A: Biopolymer transport protein ExbB B: Biopolymer transport protein ExbB C: Biopolymer transport protein ExbB D: Biopolymer transport protein ExbB E: Biopolymer transport protein ExbB F: Biopolymer transport protein ExbB G: 22-mer peptide from Biopolymer transport protein ExbD H: 22-mer peptide from Biopolymer transport protein ExbD I: 22-mer peptide from Biopolymer transport protein ExbD