An unexpected co-crystal structure of the calpain PEF(S) domain with Hfq reveals a potential chaperone function of Hfq

Cresser-Brown, Joel, Rizkallah, Pierre ORCID: https://orcid.org/0000-0002-9290-0369, Jin, Yi ORCID: https://orcid.org/0000-0002-6927-4371, Roth, Christian, Miller, David J. and Allemann, Rudolf K. ORCID: https://orcid.org/0000-0002-1323-8830 2020. An unexpected co-crystal structure of the calpain PEF(S) domain with Hfq reveals a potential chaperone function of Hfq. Acta Crystallographica Section F: Structural Biology Communications 76 (2) , pp. 81-85. 10.1107/S2053230X20001181

Preview

PDF - Published Version Download (773kB) | Preview

Abstract

Calpain is a Ca2+-activated, heterodimeric cysteine protease consisting of a large catalytic subunit and a small regulatory subunit. Dysregulation of this enzyme is involved in a range of pathological conditions such as cancer, Alzheimer's disease and rheumatoid arthritis, and thus calpain I is a drug target with potential therapeutic applications. Difficulty in the production of this enzyme has hindered structural and functional investigations in the past, although heterodimeric calpain I can be generated by Escherichia coli expression in low yield. Here, an unexpected structure discovered during crystallization trials of heterodimeric calpain I (CAPN1C115S + CAPNS1ΔGR) is reported. A novel co-crystal structure of the PEF(S) domain from the dissociated regulatory small subunit of calpain I and the RNA-binding chaperone Hfq, which was likely to be overproduced as a stress response to the recombinant expression conditions, was obtained, providing unexpected insight in the chaperone function of Hfq.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine Chemistry
Publisher:	International Union of Crystallography
ISSN:	2053-230X
Date of First Compliant Deposit:	19 February 2020
Date of Acceptance:	28 January 2020
Last Modified:	06 Jan 2024 02:24
URI:	https://orca.cardiff.ac.uk/id/eprint/129816

Actions (repository staff only)

Edit Item