ジャーナル: Arch Biochem Biophys / 年: 2024 タイトル: Cryo-EM structures of Mycobacterium tuberculosis polynucleotide phosphorylase suggest a potential mechanism for its RNA substrate degradation. 著者: Na Wang / Yanan Sheng / Yutong Liu / Yaoting Guo / Jun He / Jinsong Liu / 要旨: As one of the oldest infectious diseases in the world, tuberculosis (TB) is the second most deadly infectious disease after COVID-19. Tuberculosis is caused by Mycobacterium tuberculosis (Mtb), which ...As one of the oldest infectious diseases in the world, tuberculosis (TB) is the second most deadly infectious disease after COVID-19. Tuberculosis is caused by Mycobacterium tuberculosis (Mtb), which can attack various organs of the human body. Up to now, drug-resistant TB continues to be a public health threat. Pyrazinamide (PZA) is regarded as a sterilizing drug in the treatment of TB due to its distinct ability to target Mtb persisters. Previously we demonstrated that a D67N mutation in Mycobacterium tuberculosis polynucleotide phosphorylase (MtbPNPase, Rv2783c) confers resistance to PZA and Rv2783c is a potential target for PZA, but the mechanism leading to PZA resistance remains unclear. To gain further insight into the MtbPNPase, we determined the cryo-EM structures of apo Rv2783c, its mutant form and its complex with RNA. Our studies revealed the Rv2783c structure at atomic resolution and identified its enzymatic functional groups essential for its phosphorylase activities. We also investigated the molecular mechanisms underlying the resistance to PZA conferred by the mutation. Our research findings provide structural and functional insights enabling the development of new anti-tuberculosis drugs.
履歴
登録
2023年10月29日
登録サイト: PDBJ / 処理サイト: PDBJ
改定 1.0
2024年7月3日
Provider: repository / タイプ: Initial release
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2024年7月3日
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2024年7月3日
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2024年7月3日
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2024年7月3日
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2024年7月3日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name
名称: PNPase of Mycobacterium tuberculosis / タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / 由来: RECOMBINANT
分子量
実験値: NO
由来(天然)
生物種: Mycobacterium tuberculosis (結核菌)
由来(組換発現)
生物種: Escherichia coli (大腸菌)
緩衝液
pH: 8 / 詳細: 50mM Tris, pH 8.0, 150 Nacl, 5mM DTT
緩衝液成分
ID
濃度
名称
式
Buffer-ID
1
50mM
Tris(hydroxymethyl)aminomethanehydrochloride
Tris
1
2
150mM
sodiumchloride
Nacl
1
3
5mM
1,4-Dithiothreitol
DTT
1
試料
濃度: 6.7 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: protein sample was mixed with 15mM FOS-CHOLINE-8 (Anatrace) and rapidly loaded onto the holey carbon grids