A novel function of Mycobacterium tuberculosis chaperonin paralog GroEL1 in copper homeostasis

Among the two GroEL paralogs in Mycobacterium tuberculosis, GroEL1 and GroEL2, GroEL1 has a characteristic histidine‐rich C terminus. Since histidine richness is likely to be involved in metal binding, we attempted to decipher the role of GroEL1 in chelating metals and the consequence on M. tubercul...

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Bibliographic Details
Published in:FEBS letters 2020-10, Vol.594 (20), p.3305-3323
Main Authors: Ansari, Mohammed Yousuf, Batra, Sakshi D., Ojha, Hina, Dhiman, Kanika, Ganguly, Ashish, Tyagi, Jaya S., Mande, Shekhar C.
Format: Article
Language:English
Subjects:
copper
GroEL
His‐rich
isothermal titration calorimetry
Mycobacterium tuberculosis
small angle X‐ray scattering
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Summary:Among the two GroEL paralogs in Mycobacterium tuberculosis, GroEL1 and GroEL2, GroEL1 has a characteristic histidine‐rich C terminus. Since histidine richness is likely to be involved in metal binding, we attempted to decipher the role of GroEL1 in chelating metals and the consequence on M. tuberculosis physiology. Isothermal titration calorimetry showed that GroEL1 binds copper and other metals. Mycobacterial viability assay, redox balance, and DNA protection assay concluded that GroEL1 protects from copper stress in vitro. Solution X‐ray scattering and constrained modeling of GroEL1 −/+ copper ions showed reorientation of the apical domain as seen in functional assembly. We conclude that the duplication of chaperonin genes in M. tuberculosis might have led to their evolutionary divergence and consequent functional divergence of chaperonins.
ISSN:0014-5793
1873-3468
DOI:10.1002/1873-3468.13906