尿病原性E. coliのP piliは,繊維状の固着先がはっきりした複合繊維である
M J Kuehn1, J Heuser, S Normark
1Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110.
Nature
|March 19, 1992
まとめ
Escherichia coliは,PapGアデシンを含むP pili tip fibrillaeを使用して,尿路内のディガラクトシド受容体と結合し,感染症を引き起こす. この結合は,バクテリアのコロニー化と病原性にとって極めて重要です.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- パトジェネシス (病原生)
背景:
- エシェリキア・コライは,尿路感染症や新生児髄膜炎を含む,人間や動物の感染症の一般的な原因です.
- 宿主表面への微生物の結合は,細菌のコロニー化と感染に不可欠であり,しばしば pili. on のアデシンによって媒介されます.
- P piliは,尿路上皮質のダイガラクトシド受容体と結合する尿病原性大腸菌 (UPEC) に重要な役割を果たします.
研究 の 目的:
- P pili.内のアデシンの構造的組織を調査する.
- 尿病原性E. coliの結合機構における尖端線維の役割を明らかにする.
主な方法:
- P piliの先端にある線維構造の特徴.
- 尖端線維の組成と機能の分析,PapG付着を含む.
主要な成果:
- ウイルス性に関連した尖端線維は,P pili.の尖端で特定されました.
- これらの繊維は,主にPapEサブユニットで構成された柔軟なポリマーです.
- アルファ-D-ガラクトピラノシル-(1-4) -β-D-ガラクトピラノース (Gal alpha (1-4) Gal) を結合するPapGアデシンは,これらの線維の末端に頻繁に位置しています.
結論:
- 尖端繊維は,受容体結合のためのPapGアデシンを提示する上で重要な役割を果たします.
- これらの線維の特殊な構造と局所化は,E. coliが尿路を植民地化することを容易にする.
- これらのアデシン受容体相互作用を理解することは,E. coli感染症に対する戦略を開発するために不可欠です.
関連する概念動画
01:29Cytoskeletal Proteins in Bacteria
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
01:29Bacterial Flora of the Large Intestine
The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
01:13Special Staining Techniques
Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
01:28Fimbriae, Pili, and Axial Filaments
Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
01:23Surface Appendages of Archaea
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
01:30Bacterial Phylum Actinobacteria
Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...