+検索条件
-Structure paper
タイトル | A conformation-specific nanobody targeting the nicotinamide mononucleotide-activated state of SARM1. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 13, Issue 1, Page 7898, Year 2022 |
掲載日 | 2022年12月22日 |
著者 | Yun Nan Hou / Yang Cai / Wan Hua Li / Wei Ming He / Zhi Ying Zhao / Wen Jie Zhu / Qiang Wang / Xinyi Mai / Jun Liu / Hon Cheung Lee / Goran Stjepanovic / Hongmin Zhang / Yong Juan Zhao / |
PubMed 要旨 | Sterile alpha (SAM) and Toll/interleukin-1 receptor (TIR) motif containing 1 (SARM1) is an autoinhibitory NAD-consuming enzyme that is activated by the accumulation of nicotinamide mononucleotide ...Sterile alpha (SAM) and Toll/interleukin-1 receptor (TIR) motif containing 1 (SARM1) is an autoinhibitory NAD-consuming enzyme that is activated by the accumulation of nicotinamide mononucleotide (NMN) during axonal injury. Its activation mechanism is not fully understood. Here, we generate a nanobody, Nb-C6, that specifically recognizes NMN-activated SARM1. Nb-C6 stains only the activated SARM1 in cells stimulated with CZ-48, a permeant mimetic of NMN, and partially activates SARM1 in vitro and in cells. Cryo-EM of NMN/SARM1/Nb-C6 complex shows an octameric structure with ARM domains bending significantly inward and swinging out together with TIR domains. Nb-C6 binds to SAM domain of the activated SARM1 and stabilized its ARM domain. Mass spectrometry analyses indicate that the activated SARM1 in solution is highly dynamic and that the neighboring TIRs form transient dimers via the surface close to one BB loop. We show that Nb-C6 is a valuable tool for studies of SARM1 activation. |
リンク | Nat Commun / PubMed:36550129 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.7 - 3.78 Å |
構造データ | EMDB-34165, PDB-8gni: EMDB-34166, PDB-8gnj: EMDB-34198, PDB-8gq5: |
化合物 | ChemComp-NMN: |
由来 |
|
キーワード | HYDROLASE / NAD(+)Hydrolase / NMN / Nanobody |