ミコバクテリアのプロファージでコードされたLysinBのペプチドグリカン結合ドメインは,ヒドローラゼにおけるドメイン保存のための多様なアプローチを明らかにする
Ritam Das1, Kanika Nadar2, Ritu Arora2
1Faculty of Biological Sciences, Friedrich Schiller University, Jena, 07737, Germany; Department of Life Science, Acharya Narendra Dev College, University of Delhi, Govindpuri, Kalkaji, 110019, New Delhi, India; Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Berlin, Germany.
International journal of biological macromolecules
|September 6, 2025
まとめ
Mycobacterium fortuitumのファグから LysinB_MFという 新しい酵素を特徴付けました この酵素はバクテリアの細胞壁を標的とし,その結合領域が欠けている変種は,著しく高い活性を示した.
科学分野:
- 生物化学と分子生物学
- 微生物学とウイルス学
- 構造生物学
背景:
- ミコバクテリオファージでコードされたLysinB酵素は,ミコバクテリアの細胞壁を標的とするのに不可欠です.
- これらの酵素は通常球状の構造を持ち,ミコリルエステル結合を裂く.
- 新種のLysinBの多様性を理解することは,新しい抗菌薬戦略の開発の鍵です.
研究 の 目的:
- 新しい Mycobacterium fortuitum プロファージでコードされた LysinB (LysinB_MF) を構造的に,機能的に特徴づける.
- 酵素活性と構造におけるペプチドーガン結合領域 (PGBD) の役割を調査する.
- 水酸化酵素におけるPGBDの進化的意義を探求する.
主な方法:
- 完全な長さのLysinB_MFとそのPGBD断片化された変数の構造的および機能的特徴.
- ミコバクテリアの標的に対するエステラーゼの活性測定法
- PGBD配列の構造的比較と遺伝子解析を含むバイオ情報分析
主要な成果:
- LysinB_MFはα/βヒドロラーゼ領域と,保存された触媒三角形を持つ明確なPGBDを有している.
- LysinB_MFの全長と断片は,M. smegmatisとM. fortuitumに対する抗菌作用を示した.
- PGBDを欠いたLysinB_MFは,全長酵素と比較してエステラーゼ活性が3倍に増加した.
- PGBDは他の酵素の細胞壁結合ドメインと構造的に類似しており,ドメインの移動性を示唆している.
- PGBDは広範囲に広がり,様々な水溶質に保存され,重要な構造的多様性を表しています.
結論:
- LysinB_MFは,抗菌薬として応用可能な新しいモジュール型酵素です.
- PGBDは結合に寄与しながら,水酸化ドメインの触媒効率を調節する可能性があります.
- PGBDは進化的に重要なタンパク質モジュールで,様々な機能を持つ酵素に含まれています.
さらに関連する動画
08:06The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions
Published on: February 1, 2018
9.1K
12:23Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG
Published on: May 16, 2017
7.6K
関連する概念動画
01:22Lysosomal Hydrolases
3.9K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.9K
01:16Viral Replication: Lysogenic Cycle
202
The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
202
00:43Lysogenic Cycle of Bacteriophages
63.1K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
63.1K
01:49Conserved Binding Sites
4.3K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.3K
02:26Conservation of Protein Domains Over Different Proteins
11.3K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
11.3K
01:26DNA Bacteriophages
138
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
138