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-Structure paper
| タイトル | How sensor Amt-like proteins integrate ammonium signals. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 10, Issue 23, Page eadm9441, Year 2024 |
| 掲載日 | 2024年6月7日 |
著者 | Tobias Pflüger / Mathias Gschell / Lin Zhang / Volodymyr Shnitsar / Annas J Zabadné / Paul Zierep / Stefan Günther / Oliver Einsle / Susana L A Andrade / ![]() |
| PubMed 要旨 | Unlike aquaporins or potassium channels, ammonium transporters (Amts) uniquely discriminate ammonium from potassium and water. This feature has certainly contributed to their repurposing as ammonium ...Unlike aquaporins or potassium channels, ammonium transporters (Amts) uniquely discriminate ammonium from potassium and water. This feature has certainly contributed to their repurposing as ammonium receptors during evolution. Here, we describe the ammonium receptor Sd-Amt1, where an Amt module connects to a cytoplasmic diguanylate cyclase transducer module via an HAMP domain. Structures of the protein with and without bound ammonium were determined to 1.7- and 1.9-Ångstrom resolution, depicting the ON and OFF states of the receptor and confirming the presence of a binding site for two ammonium cations that is pivotal for signal perception and receptor activation. The transducer domain was disordered in the crystals, and an AlphaFold2 prediction suggests that the helices linking both domains are flexible. While the sensor domain retains the trimeric fold formed by all Amt family members, the HAMP domains interact as pairs and serve to dimerize the transducer domain upon activation. |
リンク | Sci Adv / PubMed:38838143 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 1.7 - 2.53 Å |
| 構造データ | EMDB-18549, PDB-8qpf: ![]() PDB-8qj3: ![]() PDB-8qj4: |
| 化合物 | ![]() ChemComp-CL: ![]() ChemComp-LMT: ![]() ChemComp-HOH: ![]() ChemComp-NH4: |
| 由来 |
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キーワード | SIGNALING PROTEIN / Ammonium receptor / OFF-state / Shewanella denitrificans / Sd-Amt1 / diguanylate cyclase / Amt / ON-state / TRANSPORT PROTEIN / Ammonium Transporter Amt1 |
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shewanella denitrificans (バクテリア)
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