Lipid Modification of the Cu,Zn Superoxide Dismutase from Mycobacterium Tuberculosis
Overview
Affiliations
The leader sequence of Mycobacterium tuberculosis Cu,Zn superoxide dismutase (Cu,ZnSOD) contains a prokaryotic membrane lipoprotein attachment site. In the present study, we have found that the protein, which exhibits detectable SOD activity, is lipid-modified and associated with the bacterial membrane when expressed either in M. tuberculosis or in Escherichia coli. These results provide the first demonstration of lipid modification of a Cu,ZnSOD. An analysis of the sodC genes present in available databases indicates that the same signal for lipid modification is also present in the sodC gene products from other mycobacteria and Gram-positive bacteria and, uniquely, in two distinct sodC gene products from the Gram-negative bacterium Salmonella typhimurium. Evidence is also provided for an up-regulation of M. tuberculosis sodC in response to phagocytosis by human macrophages, suggesting that Cu,ZnSOD is involved in the mechanisms that facilitate mycobacterial intracellular growth.
Old dogs, new tricks: New insights into the iron/manganese superoxide dismutase family.
Frye K, Sendra K, Waldron K, Kehl-Fie T J Inorg Biochem. 2022; 230:111748.
PMID: 35151099 PMC: 9112591. DOI: 10.1016/j.jinorgbio.2022.111748.
Bendre A, Peters P, Kumar J J Membr Biol. 2021; 254(3):321-341.
PMID: 33954837 PMC: 8099146. DOI: 10.1007/s00232-021-00179-w.
Schatzman S, Culotta V ACS Infect Dis. 2018; 4(6):893-903.
PMID: 29517910 PMC: 5993627. DOI: 10.1021/acsinfecdis.8b00026.
Tat-dependent translocation of an F420-binding protein of Mycobacterium tuberculosis.
Bashiri G, Perkowski E, Turner A, Feltcher M, Braunstein M, Baker E PLoS One. 2012; 7(10):e45003.
PMID: 23110042 PMC: 3478262. DOI: 10.1371/journal.pone.0045003.
Virulence factors of the Mycobacterium tuberculosis complex.
Forrellad M, Klepp L, Gioffre A, Sabio Y Garcia J, Morbidoni H, de la Paz Santangelo M Virulence. 2012; 4(1):3-66.
PMID: 23076359 PMC: 3544749. DOI: 10.4161/viru.22329.