Light control of the peptide-loading complex synchronizes antigen translocation and MHC I trafficking.

Light control of the peptide-loading complex synchronizes antigen translocation and MHC I trafficking.
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DOI:
10.1038/s42003-021-01890-z
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发表时间:
2021-03-30
影响因子:
5.9
通讯作者:
Tampé R
Tampé R
中科院分区:
生物学2区
文献类型:
--
作者:
Brunnberg J;Herbring V;Günther Castillo E;Krüger H;Wieneke R;Tampé R

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通过主要组织相容性复合物I类(MHC I)分子的抗原呈递对于针对病原体和癌细胞的适应性免疫应答是必不可少的。为此,与抗原加工相关的转运蛋白(TAP)将蛋白酶体降解产生的细胞蛋白质组片段递送到ER腔中。在通过肽加载复合物(PLC)的肽加载和编辑之后,稳定的肽-MHC I复合物被释放用于细胞表面呈递。由于MHC I运输的过程是不明确的,我们建立了一种方法来控制抗原提呈通过引入光笼氨基酸的催化ATP结合位点的TAP。通过光学控制,我们启动TAP依赖性抗原易位,从而提供了新的见解TAP功能内PLC和MHC I运输活细胞。此外,这种多功能的方法有可能被应用于研究其他细胞途径控制的P-环ATP/GTP酶。Brunnberg等人建立了一种方案,使他们能够光学控制与抗原加工相关的转运蛋白(TAP)的易位,TAP在将蛋白酶体降解产物递送到ER腔中中起作用。他们的多功能方法提供了深入了解TAP功能的背景下,肽负载复合物和稳定的肽-MHC I复合物在活细胞中的运输,但有可能被应用到其他途径的调查。
Antigen presentation via major histocompatibility complex class I (MHC I) molecules is essential to mount an adaptive immune response against pathogens and cancerous cells. To this end, the transporter associated with antigen processing (TAP) delivers snippets of the cellular proteome, resulting from proteasomal degradation, into the ER lumen. After peptide loading and editing by the peptide-loading complex (PLC), stable peptide-MHC I complexes are released for cell surface presentation. Since the process of MHC I trafficking is poorly defined, we established an approach to control antigen presentation by introduction of a photo-caged amino acid in the catalytic ATP-binding site of TAP. By optical control, we initiate TAP-dependent antigen translocation, thus providing new insights into TAP function within the PLC and MHC I trafficking in living cells. Moreover, this versatile approach has the potential to be applied in the study of other cellular pathways controlled by P-loop ATP/GTPases. Brunnberg et al. establish a protocol that enables them to optically control translocation of the transporter associated with antigen processing (TAP), which plays a role in delivering proteasomal degradation products into the ER lumen. Their versatile approach provides insights into TAP function in the context of peptide-loading complex and stable peptide-MHC I complex trafficking in living cells, but has the potential to be applied to the investigation of other pathways.
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