Purification and Characterization of a Stable, Membrane-Associated Peptidoglycan Responsive Adenylate Cyclase LRR Domain from Human Commensal Candida albicans

Biochemistry. 2022 Dec 20;61(24):2856-2860. doi: 10.1021/acs.biochem.2c00305. Epub 2022 Jul 11.

Abstract

The evolutionarily conserved leucine rich repeat (LRR) protein domain is a unique structural motif found in many viral, bacterial, archaeal, and eukaryotic proteins. The LRR domain serves many roles, including being a signaling domain and a pathogen recognition receptor. In the human innate immune system, it serves an essential role by recognizing fragments of bacterial cell walls. Interestingly, the human fungal pathogen Candida albicans also uses an LRR domain-containing protein, Cyrp1, to sense bacterial cell wall fragments. However, the dynamics of signaling and detection of bacterial peptidoglycan fragments by the LRR of Cyr1p remains poorly characterized. Here we develop optimal recombinant expression workflows and provide characterization of the entire region of the LRR domain of Cyr1p as a peripheral membrane protein. Using a newly designed peptidoglycan enrichment bead assay, we demonstrate that this domain can bind bacterial peptidoglycan fragments under native conditions. The new membrane-associated Cyr1p-LRR construct sets the stage for the development of antifungal agents via high-throughput campaigns to inhibit cell wall-Cyr1p interactions.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, N.I.H., Extramural

MeSH terms

  • Adenylyl Cyclases* / metabolism
  • Bacteria / metabolism
  • Candida albicans*
  • Cell Wall / metabolism
  • Humans
  • Peptidoglycan / metabolism
  • Signal Transduction

Substances

  • Adenylyl Cyclases
  • Peptidoglycan