A conformation-specific nanobody targeting the nicotinamide mononucleotide-activated state of SARM1.
A conformation-specific nanobody targeting the nicotinamide mononucleotide-activated state of SARM1.
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DOI:
10.1038/s41467-022-35581-y
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发表时间:
2022-12-22
影响因子:
16.6
通讯作者:
Zhao, Yong Juan
中科院分区:
文献类型:
--
作者:
Hou, Yun Nan;Cai, Yang;Li, Wan Hua;He, Wei Ming;Zhao, Zhi Ying;Zhu, Wen Jie;Wang, Qiang;Mai, Xinyi;Liu, Jun;Lee, Hon Cheung;Stjepanovic, Goran;Zhang, Hongmin;Zhao, Yong Juan
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. SARM1 is a key player in axon degeneration. Here, the authors generate a nanobody, which specifically recognizes the NMN-bound state of SARM1 and helps resolve the SARM1 structure in an intermediate state of activation.
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影响因子:
48
作者:
Kucukelbir, Alp;Sigworth, Fred J.;Tagare, Hemant D.
通讯作者:
Tagare, Hemant D.
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通讯作者:
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