An isotope labeled asymmetric cross-linker is provided for the detection of cross-linked peptides. A cross-linking and mass spectrometry strategy, referred to as isotope tagging of interacting proteins (iTIP), improves the specificity of detecting cross-linked peptides and accurate identification of the interacting peptide sequences via the incorporation of isotopic signatures that are readily observed in the MS/MS spectrum. Isotope tagged peptides can be identified using mass spectrometry based on doublet peaks in a spectrum. Spectra can be subjected to database search strategies available for the sequencing of linear or non-cross-linked peptides.
提供了一种同位素标记的不对称
交联剂,用于检测交联肽。一种交联和质谱策略,称为相互作用蛋白同位素标记(iTIP),通过在MS / MS谱中容易观察到的同位素标记的纳入,提高了检测交联肽的特异性和准确鉴定相互作用肽序列的能力。同位素标记的肽可以通过谱中的双峰进行质谱鉴定。谱图可以进行数据库搜索策略,可用于线性或非交联肽的测序。