Thiol-disulphide independent in-cell trapping for the identification of peroxiredoxin 2 interactors

• Published in: Redox biology 2021-10, Vol.46, p.102066, Article 102066
• Main Authors: Luo, Ting, Pueyo, Julia Malo, Wahni, Khadija, Yvanoff, Charlotte, Lazar, Tamas, Pyr dit Ruys, Sébastien, Vertommen, Didier, Ezeriņa, Daria, Messens, Joris
• Format: Article
• Language: English
• Subjects: BioID; Disulfides; Hydrogen Peroxide; Oxidation-Reduction; Peroxiredoxin; Peroxiredoxins - genetics; Peroxiredoxins - metabolism; Prdx2; Protein-protein interactions; Proximity labelling; Redox signalling; Research Paper; Sulfhydryl Compounds
• ISSN: 2213-2317; 2213-2317
• DOI: 10.1016/j.redox.2021.102066

Hydrogen peroxide (H2O2) acts as a signalling molecule by oxidising cysteine thiols in proteins. Recent evidence has established a role for cytosolic peroxiredoxins in transmitting H2O2-based oxidation to a multitude of target proteins. Moreover, it is becoming clear that peroxiredoxins fulfil their function in organised microdomains, where not all interactors are covalently bound. However, most studies aimed at identifying peroxiredoxin interactors were based on methods that only detect covalently linked partners. Here, we explore the applicability of two thiol-disulphide independent in-cell trapping methodological approaches in combination with mass spectrometry for the identification of interaction partners of peroxiredoxin 2 (Prdx2). The first is biotin-dependent proximity-labelling (BioID) with a biotin ligase A (BirA*)-fused Prdx2, which has never been applied on redox-active proteins. The second is crosslinker co-immunoprecipitation with an N-terminally His-tagged Prdx2. During the initial characterisation of the tagged Prdx2 constructs, we found that the His-tag, but not BirA*, compromises the peroxidase and signalling activities of Prdx2. Further, the Prdx2 interactors identified with each approach showed little overlap. We therefore concluded that BioID is a more reliable method than crosslinker co-immunoprecipitation. After a stringent mass spec data filtering, BioID identified 13 interactors under elevated H2O2 conditions, including subunit five of the COP9 signalosome complex (CSN5). The Prdx2:CSN5 interaction was further confirmed in a proximity ligation assay. Taken together, our results demonstrate that BioID can be used as a method for the identification of interactors of Prdxs, and that caution should be exercised when interpreting protein-protein interaction results using tagged Prdxs. [Display omitted] •BioID is a thiol-disulphide independent method that can be used to trap Prdx2 interactors.•Prdx2 interacts with subunit five of the COP9 signalosome complex (CSN5).•N-terminally His-tagged Prdx2 displays compromised peroxidase and signalling activity.•The tag attached to Prdx2 influences its interactome.