Identification of the monocyte activating motif in Mycobacterium tuberculosis chaperonin 60.1

Research output: Contribution to journalArticlepeer-review


  • Yanmin Hu
  • Anthony R M Coates
  • Alexander Liu
  • Peter Lund
  • Brian Henderson

Colleges, School and Institutes


Evidence is emerging that moonlighting proteins, defined as proteins with more than one biological function, play important roles in bacterial virulence. The Mycobacterium tuberculosis chaperone, chaperonin 60.1, is a potent stimulator of human monocyte cytokine synthesis and modulator of giant cell and osteoclast formation. Previously, we had shown that these moonlighting activities resided in the equatorial domain of this protein. In this study, through the generation of chaperonin 60.1 amino acid sequence-deletion mutants and synthetic peptides, we have identified the minimal moonlighting site in this molecular chaperone responsible for monocyte activation as peptide sequence DGSVVVNKVSELPAGHGLNVNTLSYGDLAAD, residues 461-491, in the equatorial domain, Modelling of this biologically active sequence in the M. tuberculosis chaperonin 60.1 protein reveals a surface-exposed motif with significant α-helical structure.

Bibliographic note

Copyright © 2013 Elsevier Ltd. All rights reserved.


Original languageEnglish
Pages (from-to)442–447
Number of pages6
Issue number4
Early online date3 May 2013
Publication statusPublished - Jul 2013