クロストリディオイドス・ディフィシル・フェロソーム・オルガネルは,栄養免疫と闘う

Hualiang Pi^1,2,3, Rong Sun^4,5,6,7, James R McBride⁸

¹Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University, Nashville, TN, USA.

Nature

|November 15, 2023

まとめ

Clostridioides difficileは炎症した腸の生存に不可欠な新種のフェロソーム臓器に鉄を貯蔵しますこの発見により細菌の鉄の恒常性と病原性に関する新しいメカニズムが明らかになりました

科学分野:

微生物学
生物化学
病原性

背景:

鉄は生命に不可欠ですが高濃度で毒性があります
細菌の病原体は複雑な鉄の管理戦略を持っています
以前は,グラム陰性細菌のみでフェロソーム粒子が観察されていました.

研究の目的:

グラム陽性細菌Clostridioides difficileの鉄貯蔵機構を調査する.
C. difficile の鉄の恒常性および感染におけるフェロソームの役割を決定する.

主な方法:

低温電子トモグラフィーでフェロソームの位置を視覚化します
フェロソーム形成に関与するタンパク質 (FezA,FezB) を特定するための遺伝分析.
フェロソーム機能を in vivoで評価するためのC. difficile感染のマウスモデル.

主要な成果:

C. difficileは,鉄酸塩生物ミネラルを含んだ細胞内,膜に結合した鉄体器官を形成する.
FezAとFezBのタンパク質は,フェロソームの生体生成と鉄の恒常性のために不可欠です.
腸内でのC. difficile感染中にフェロソーム系が活性化され,鉄の収縮を克服する.

結論:

Clostridioides difficileはフェロソームによるユニークな細胞内鉄生物鉱化プロセスを利用しています.
フェロソームはC. difficileのコロニー化と宿主関連感染症の生存に不可欠です.
この発見は,鉄の貯蔵と管理のための既知の細菌のレパートリーを拡張します.

さらに関連する動画

06:51

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Published on: December 10, 2016

12.5K

09:12

A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

Published on: June 15, 2018

10.1K

関連する概念動画

01:28

Microbial Nutrition

Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...

01:31

Defense Against Bacterial Pathogens

1.4K

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...

1.4K

01:28

Fungal Phylum Microsporidia

Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...

01:16

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...

01:23

Antimicrobial Proteins

1.0K

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...

1.0K

01:20

Endospores and Sporulation

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...

関連する実験動画