用于SPY信号网络映射的TurboID介导的邻近标记的工作流程增强

Workflow enhancement of TurboID-mediated proximity labeling for SPY signaling network mapping.

作者信息

Grismer TaraBryn S, Karundasa Sumudu S, Shrestha Ruben, Byun Danbi, Ni Weimin, Reyes Andres V, Xu Shou-Ling

机构信息

Division of biosphere science and engineering, Carnegie Institution for Science, Stanford, California, USA.

Carnegie Mass Spectrometry Facility, Carnegie Institution for Science, Stanford, California, USA.

出版信息

bioRxiv. 2024 Feb 18:2024.02.17.580820. doi: 10.1101/2024.02.17.580820.

Abstract

TurboID-based proximity labeling coupled to mass spectrometry (PL-MS) has emerged as a powerful tool for mapping protein-protein interactions in both plant and animal systems. Despite advances in sensitivity, PL-MS studies can still suffer from false negatives, especially when dealing with low abundance bait proteins and their transient interactors. Protein-level enrichment for biotinylated proteins is well developed and popular, but direct detection of biotinylated proteins by peptide-level enrichment and the difference in results between direct and indirect detection remain underexplored. To address this gap, we compared and improved enrichment and data analysis methods using TurboID fused to SPY, a low-abundance O-fucose transferase, using an AAL-enriched SPY target library for cross-referencing. Our results showed that MyOne and M280 streptavidin beads significantly outperformed antibody beads for peptide-level enrichment, with M280 performing best. In addition, while a biotin concentration ≤ 50 μM is recommended for protein-level enrichment in plants, higher biotin concentrations can be used for peptide-level enrichment, allowing us to improve detection and data quality. FragPipe's MSFragger protein identification and quantification software outperformed Maxquant and Protein Prospector for SPY interactome enrichment due to its superior detection of biotinylated peptides. Our improved washing protocols for protein-level enrichment mitigated bead collapse issues, improving data quality, and reducing experimental time. We found that the two enrichment methods provided complementary results and identified a total of 160 SPY-TurboID-enriched interactors, including 60 previously identified in the AAL-enriched SPY target list and 100 additional novel interactors. SILIA quantitative proteomics comparing WT and mutants showed that SPY affects the protein levels of some of the identified interactors, such as nucleoporin proteins. We expect that our improvement will extend beyond TurboID to benefit other PL systems and hold promise for broader applications in biological research.

摘要

基于TurboID的邻近标记与质谱联用(PL-MS)已成为在植物和动物系统中绘制蛋白质-蛋白质相互作用图谱的强大工具。尽管在灵敏度方面取得了进展,但PL-MS研究仍可能存在假阴性结果,尤其是在处理低丰度诱饵蛋白及其瞬时相互作用蛋白时。蛋白质水平上对生物素化蛋白的富集技术已经很成熟且应用广泛,但通过肽段水平富集直接检测生物素化蛋白以及直接检测和间接检测结果的差异仍未得到充分研究。为了填补这一空白,我们使用与低丰度O-岩藻糖基转移酶SPY融合的TurboID,通过AAL富集的SPY靶标文库进行交叉引用,比较并改进了富集和数据分析方法。我们的结果表明,在肽段水平富集方面,MyOne和M280链霉亲和素磁珠明显优于抗体磁珠,其中M280表现最佳。此外,虽然在植物中蛋白质水平富集时建议生物素浓度≤50μM,但较高的生物素浓度可用于肽段水平富集,这使我们能够提高检测和数据质量。由于FragPipe的MSFragger蛋白质鉴定和定量软件对生物素化肽段的检测能力更强,因此在SPY相互作用组富集方面优于Maxquant和Protein Prospector。我们改进的蛋白质水平富集洗涤方案缓解了磁珠塌陷问题,提高了数据质量并缩短了实验时间。我们发现这两种富集方法提供了互补的结果,共鉴定出160个SPY-TurboID富集的相互作用蛋白,其中包括60个先前在AAL富集的SPY靶标列表中鉴定出的蛋白以及100个额外的新相互作用蛋白。通过比较野生型和突变体的SILIA定量蛋白质组学表明,SPY会影响一些已鉴定的相互作用蛋白的水平,如核孔蛋白。我们期望我们的改进不仅适用于TurboID,还能惠及其他PL系统,并有望在生物学研究中得到更广泛的应用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee21/10888891/3013ae9aec77/nihpp-2024.02.17.580820v1-f0001.jpg

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