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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

355
Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Bacterial Protein Maturation01:26

Bacterial Protein Maturation

81
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
81
Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

94
Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
94
Oligosaccharide Assembly01:24

Oligosaccharide Assembly

3.0K
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
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Protein Folding Quality Check in the RER01:29

Protein Folding Quality Check in the RER

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

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Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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ペプチドグリカンの成熟は外膜タンパク質の組成を制御する

Gideon Mamou1, Federico Corona2,3, Ruth Cohen-Khait1

  • 1Department of Biochemistry, South Parks Road, University of Oxford, Oxford, UK.

Nature
|June 15, 2022
PubMed
まとめ

グラム陰性細菌のペプチドグリカン構造は外膜タンパク質 (OMP) の挿入を誘導する. 成熟したペプチドグリカンは,OMPの挿入を制限し,細胞の成長中にOMPが優先的に挿入されるようにします.

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Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth
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Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
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Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii

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科学分野:

  • 微生物学
  • 細胞生物学
  • 生物化学

背景:

  • 外膜タンパク質 (OMP) は,グラム陰性細菌の外膜機能と完全性にとって不可欠である.
  • β-バレル組立装置 (BAM) 複合体は,OMPを外膜に挿入する責任を負う.
  • 成長中のEscherichia coliで観察されたOMPの極性分離のメカニズムは不明である.

研究 の 目的:

  • グラム陰性細菌における外膜タンパク質 (OMP) の空間時間的組織におけるペプチドグリカンの役割を調査する.
  • ペプチドグライカンの成熟がOMPの生殖と挿入にどのように影響するか解明する.
  • 細胞分裂中の OMP のバイナリ分割の基礎を理解する.

主な方法:

  • ペプチドグリカンとBAM成分間の相互作用を,生化学的アッセイを用いて調査した.
  • 異なるペプチドグリカン成熟状態が,OMPフォルダース活性に与える影響を評価した.
  • 細胞分裂中のOMPの局所化と挿入を追跡するために,顕微鏡と遺伝的アプローチを使用した.

主要な成果:

  • 成熟したペプチドグリカンは,BAM成分と結合し,OMPフォルダースの活性を抑制する.
  • セプタで発見される新生ペプチドグリカンは,BAMと弱く相互作用し,最小限の抑制効果を示します.
  • この差異的相互作用は,細胞分裂部位に新しいOMPの優先挿入につながり,バイナリ分割を説明します.

結論:

  • ペプチドグライカンの成熟は,外膜タンパク質の生体生成とグラム陰性細菌の局所化の重要な調節因子である.
  • 細胞壁の合成とOMPの挿入の調整により,適切な細胞膜の組み立てと整合性が確保されます.
  • この規制メカニズムは 新種の抗生物質の開発の 潜在的なターゲットです