7LJ1

Human Prx1-Srx Decameric Complex

Summary for 7LJ1

• Entry DOI: 10.2210/pdb7lj1/pdb
• Descriptor: Peroxiredoxin-1, Sulfiredoxin-1, 1,2-ETHANEDIOL, ... (8 entities in total)
• Functional Keywords: prx, srx, oxidoreductase
• Biological source: Homo sapiens (Human); More
• Total number of polymer chains: 40
• Total formula weight: 684839.93

Authors

Forshaw, T.E.,Reisz, J.A.,Nelson, K.J.,Gumpena, R.,Lawson, J.R.,Jonsson, T.,Wu, H.,Clodfelter, J.E.,Johnson, L.,Furdui, C.M.,Lowther, W.T. (deposition date: 2021-01-28, release date: 2021-07-14, Last modification date: 2024-11-06)

Primary citation

Forshaw, T.E.,Reisz, J.A.,Nelson, K.J.,Gumpena, R.,Lawson, J.R.,Jonsson, T.J.,Wu, H.,Clodfelter, J.E.,Johnson, L.C.,Furdui, C.M.,Lowther, W.T.
Specificity of Human Sulfiredoxin for Reductant and Peroxiredoxin Oligomeric State.
Antioxidants (Basel), 10:-, 2021

PubMed Abstract: Human peroxiredoxins (Prx) are a family of antioxidant enzymes involved in a myriad of cellular functions and diseases. During the reaction with peroxides (e.g., HO), the typical 2-Cys Prxs change oligomeric structure between higher order (do)decamers and disulfide-linked dimers, with the hyperoxidized inactive state (-SOH) favoring the multimeric structure of the reduced enzyme. Here, we present a study on the structural requirements for the repair of hyperoxidized 2-Cys Prxs by human sulfiredoxin (Srx) and the relative efficacy of physiological reductants hydrogen sulfide (HS) and glutathione (GSH) in this reaction. The crystal structure of the toroidal Prx1-Srx complex shows an extended active site interface. The loss of this interface within engineered Prx2 and Prx3 dimers yielded variants more resistant to hyperoxidation and repair by Srx. Finally, we reveal for the first time Prx isoform-dependent use of and potential cooperation between GSH and HS in supporting Srx activity.

PubMed: 34208049
DOI: 10.3390/antiox10060946

Experimental method

X-RAY DIFFRACTION (2.97 Å)