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-Structure paper
| タイトル | Structural insights into bacterial dimethylsulfoniopropionate import by BCCT-family transporters. |
|---|---|
| ジャーナル・号・ページ | EMBO J, Vol. 45, Issue 12, Page 4299-4320, Year 2026 |
| 掲載日 | 2026年5月8日 |
著者 | Yu-Zhong Zhang / Wen-Jing Zhu / Kang Li / Hai-Tao Ding / Motoyuki Hattori / Shuaimeng Liu / Chang Ge / Qi-Long Qin / Zhao-Jie Teng / Ning-Hua Liu / Hai-Yan Cao / Chun-Yang Li / Xiu-Lan Chen / Qing-Tao Shen / Jonathan D Todd / Lu-Ning Liu / Peng Wang / ![]() |
| PubMed 要旨 | Dimethylsulfoniopropionate (DMSP) is a ubiquitous marine organosulfur compound central to microbial stress responses, chemotaxis, and nutrient cycling. Its catabolism produces dimethylsulfide (DMS), ...Dimethylsulfoniopropionate (DMSP) is a ubiquitous marine organosulfur compound central to microbial stress responses, chemotaxis, and nutrient cycling. Its catabolism produces dimethylsulfide (DMS), a climate-active gas, and plays a key role in the global sulfur cycle. However, the molecular basis of DMSP import, underpinning its microbial metabolism, remains poorly understood. Here, we identify and characterize the BCCT-family transporter DddT from Psychrobacter sp. D2, a marine gamma-proteobacterium that utilizes DMSP as a carbon source. DddT is essential for DMSP uptake and functions as a Na-coupled symporter driven by the transmembrane sodium gradient. Using cryo-electron microscopy, we determined DddT structures in multiple conformational states, revealing its Na-dependent transport mechanism involving two sodium ions, one coordinated by a previously uncharacterized binding site. Sequence analysis shows that DddT-like proteins with conserved sodium-binding features are widespread in marine bacteria, suggesting this Na-coupled transport mechanism represents a broadly conserved feature of the BCCT family. Our findings provide mechanistic insights into sodium-driven substrate uptake and marine sulfur cycling. |
リンク | EMBO J / PubMed:42104083 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.52 - 3.29 Å |
| 構造データ | EMDB-67623, PDB-21ff: EMDB-67625, PDB-21fh: EMDB-67626, PDB-21fi: EMDB-67627, PDB-21fj: EMDB-67628, PDB-21fk: |
| 化合物 | ![]() ChemComp-NA: ![]() ChemComp-HOH: ![]() ChemComp-DQY: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Trimer / Psychrobacter sp. D2 / Dimethylsulfoniopropionate transporter / Closed substrate-free conformation / Substrate-free outward open conformation / Closed DMSP-bound conformation / Closed substrate-free conformation in the presence of potassium ions and dimethylsulfoniopropionate / Substrate-free inward open conformation |
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psychrobacter sp. d2 (バクテリア)
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