+検索条件
-Structure paper
| タイトル | Structure of OmcZ filaments suggests extracellular cytochrome polymers evolved independently multiple times. |
|---|---|
| ジャーナル・号・ページ | Elife, Vol. 11, Year 2022 |
| 掲載日 | 2022年9月5日 |
著者 | Fengbin Wang / Chi Ho Chan / Victor Suciu / Khawla Mustafa / Madeline Ammend / Dong Si / Allon I Hochbaum / Edward H Egelman / Daniel R Bond / ![]() |
| PubMed 要旨 | While early genetic and low-resolution structural observations suggested that extracellular conductive filaments on metal-reducing organisms such as were composed of type IV pili, it has now been ...While early genetic and low-resolution structural observations suggested that extracellular conductive filaments on metal-reducing organisms such as were composed of type IV pili, it has now been established that bacterial -type cytochromes can polymerize to form extracellular filaments capable of long-range electron transport. Atomic structures exist for two such cytochrome filaments, formed from the hexaheme cytochrome OmcS and the tetraheme cytochrome OmcE. Due to the highly conserved heme packing within the central OmcS and OmcE cores, and shared pattern of heme coordination between subunits, it has been suggested that these polymers have a common origin. We have now used cryo-electron microscopy (cryo-EM) to determine the structure of a third extracellular filament, formed from the octaheme cytochrome, OmcZ. In contrast to the linear heme chains in OmcS and OmcE from the same organism, the packing of hemes, heme:heme angles, and between-subunit heme coordination is quite different in OmcZ. A branched heme arrangement within OmcZ leads to a highly surface exposed heme in every subunit, which may account for the formation of conductive biofilm networks, and explain the higher measured conductivity of OmcZ filaments. This new structural evidence suggests that conductive cytochrome polymers arose independently on more than one occasion from different ancestral multiheme proteins. |
リンク | Elife / PubMed:36062910 / PubMed Central |
| 手法 | EM (らせん対称) |
| 解像度 | 4.2 Å |
| 構造データ | EMDB-27266, PDB-8d9m: |
| 化合物 | ![]() ChemComp-HEC: |
| 由来 |
|
キーワード | ELECTRON TRANSPORT / PROTEIN FIBRIL / helical symmetry / cytochrome nanowire / filament |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク


geobacter sulfurreducens (バクテリア)
キーワード