Rapid Mapping of Protein Interactions Using Tag-Transfer Photocrosslinkers.

Rapid Mapping of Protein Interactions Using Tag-Transfer Photocrosslinkers.
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DOI:
10.1002/anie.201809149
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发表时间:
2018-12-17
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Radford SE
Radford SE
中科院分区:
其他
文献类型:
--
作者:
Horne JE;Walko M;Calabrese AN;Levenstein MA;Brockwell DJ;Kapur N;Wilson AJ;Radford SE

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Analysing protein complexes by chemical crosslinking‐mass spectrometry (XL‐MS) is limited by the side‐chain reactivities and sizes of available crosslinkers, their slow reaction rates, and difficulties in crosslink enrichment, especially for rare, transient or dynamic complexes. Here we describe two new XL reagents that incorporate a methanethiosulfonate (MTS) group to label a reactive cysteine introduced into the bait protein, and a residue‐unbiased diazirine‐based photoactivatable XL group to trap its interacting partner(s). Reductive removal of the bait transfers a thiol‐containing fragment of the crosslinking reagent onto the target that can be alkylated and located by MS sequencing and exploited for enrichment, enabling the detection of low abundance crosslinks. Using these reagents and a bespoke UV LED irradiation platform, we show that maximum crosslinking yield is achieved within 10 seconds. The utility of this “tag and transfer” approach is demonstrated using a well‐defined peptide/protein regulatory interaction (BID80‐102/MCL‐1), and the dynamic interaction interface of a chaperone/substrate complex (Skp/OmpA).
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