Maize nicotinate N-methyltransferase interacts with the NLR protein Rp1-D21 and modulates the hypersensitive response.

Maize nicotinate N-methyltransferase interacts with the NLR protein Rp1-D21 and modulates the hypersensitive response.
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玉米烟酸 N-甲基转移酶与 NLR 蛋白 Rp1-D21 相互作用并调节过敏反应

DOI:
10.1111/mpp.13044
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发表时间:
2021-05
影响因子:
4.9
通讯作者:
Wang GF
Wang GF
中科院分区:
农林科学1区
文献类型:
--
作者:
Liu M;Li YJ;Zhu YX;Sun Y;Wang GF

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大多数植物细胞内免疫受体属于核苷酸结合富含亮氨酸重复序列(NLR)蛋白。NLR与其相应的病原体效应物之间的识别通常会在病原体感染部位触发超敏反应(HR)。烟酸N-甲基转移酶(NANMT)负责在植物中将烟酸转化为胡芦巴碱。然而,NANMT在植物防御反应中的作用尚不清楚。在这项研究中,我们证明了玉米ZmNANMT,而不是它的近亲同源物ZmCOMT,木质素生物合成途径中的一种酶,抑制了由自激活的NLR蛋白Rp1-D21及其N端螺旋卷曲信号域(CCD21)介导的HR。ZmNANMT,而不是ZmCOMT,与CCD21相互作用,并与木质素生物合成的两个关键酶HCT1806和CCoAOMT2形成复合体,这两个酶也可以抑制Rp1-D21介导的自活性HR。ZmNANMT主要定位于细胞质和胞核,其中任何一种定位都对抑制HR表型具有重要意义。这些结果为进一步阐明NANMTs在植物抗病中的分子机制奠定了基础。玉米ZmNANMT与NLR蛋白Rp1-D21相互作用,并调节其在本氏烟草中瞬时表达时的超敏反应,而不是其近的同源物ZmCOMT。
Most plant intracellular immune receptors belong to nucleotide‐binding, leucine‐rich repeat (NLR) proteins. The recognition between NLRs and their corresponding pathogen effectors often triggers a hypersensitive response (HR) at the pathogen infection sites. The nicotinate N‐methyltransferase (NANMT) is responsible for the conversion of nicotinate to trigonelline in plants. However, the role of NANMT in plant defence response is unknown. In this study, we demonstrated that the maize ZmNANMT, but not its close homolog ZmCOMT, an enzyme in the lignin biosynthesis pathway, suppresses the HR mediated by the autoactive NLR protein Rp1‐D21 and its N‐terminal coiled‐coil signalling domain (CCD21). ZmNANMT, but not ZmCOMT, interacts with CCD21, and they form a complex with HCT1806 and CCoAOMT2, two key enzymes in lignin biosynthesis, which can also suppress the autoactive HR mediated by Rp1‐D21. ZmNANMT is mainly localized in the cytoplasm and nucleus, and either localization is important for suppressing the HR phenotype. These results lay the foundation for further elucidating the molecular mechanism of NANMTs in plant disease resistance. Maize ZmNANMT, but not its close homolog ZmCOMT, interacts with the NLR protein Rp1‐D21 and modulates the hypersensitive response when transiently expressed in Nicotiana benthamiana.
DOI: 10.1126/science.1236011
发表时间: 2013-08-16
期刊: Science (New York, N.Y.)
影响因子: --
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