8POC

Cryo-EM structure of Dickeya dadantii BcsD

8POC の概要

• エントリーDOI: 10.2210/pdb8poc/pdb
• EMDBエントリー: 17735 17788
• 分子名称: Cellulose synthase operon protein D (1 entity in total)
• 機能のキーワード: cellulose secretion, bacterial biofilms, cytoskeleton, cytosolic protein
• 由来する生物種: Dickeya dadantii 3937
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 71721.16

構造登録者

Notopoulou, A.,Krasteva, P.V. (登録日: 2023-07-04, 公開日: 2023-12-20, 最終更新日: 2024-01-24)

主引用文献

Sana, T.G.,Notopoulou, A.,Puygrenier, L.,Decossas, M.,Moreau, S.,Carlier, A.,Krasteva, P.V.
Structures and roles of BcsD and partner scaffold proteins in proteobacterial cellulose secretion.
Curr.Biol., 34:106-, 2024

PubMed Abstract: Cellulose is the world's most abundant biopolymer, and similar to its role as a cell wall component in plants, it is a prevalent constituent of the extracellular matrix in bacterial biofilms. Although bacterial cellulose (BC) was first described in the 19 century, it was only recently revealed that it is produced by several distinct types of Bcs secretion systems that feature multiple accessory subunits in addition to a catalytic BcsAB synthase tandem. We recently showed that crystalline cellulose secretion in the Gluconacetobacter genus (α-Proteobacteria) is driven by a supramolecular BcsH-BcsD scaffold-the "cortical belt"-which stabilizes the synthase nanoarrays through an unexpected inside-out mechanism for secretion system assembly. Interestingly, while bcsH is specific for Gluconacetobacter, bcsD homologs are widespread in Proteobacteria. Here, we examine BcsD homologs and their gene neighborhoods from several plant-colonizing β- and γ-Proteobacteria proposed to secrete a variety of non-crystalline and/or chemically modified cellulosic polymers. We provide structural and mechanistic evidence that through different quaternary structure assemblies BcsD acts with proline-rich BcsH, BcsP, or BcsO partners across the proteobacterial clade to form synthase-interacting intracellular scaffolds that, in turn, determine the biofilm strength and architecture in species with strikingly different physiology and secreted biopolymers.

PubMed: 38141614
DOI: 10.1016/j.cub.2023.11.057

実験手法

ELECTRON MICROSCOPY (4 Å)