Archaeal membrane-associated proteases: insights on Haloferax volcanii and other haloarchaea

Frontiers in Microbiology
María Inés GiménezRosana E De Castro

Abstract

The function of membrane proteases range from general house-keeping to regulation of cellular processes. Although the biological role of these enzymes in archaea is poorly understood, some of them are implicated in the biogenesis of the archaeal cell envelope and surface structures. The membrane-bound ATP-dependent Lon protease is essential for cell viability and affects membrane carotenoid content in Haloferax volcanii. At least two different proteases are needed in this archaeon to accomplish the posttranslational modifications of the S-layer glycoprotein. The rhomboid protease RhoII is involved in the N-glycosylation of the S-layer protein with a sulfoquinovose-containing oligosaccharide while archaeosortase ArtA mediates the proteolytic processing coupled-lipid modification of this glycoprotein facilitating its attachment to the archaeal cell surface. Interestingly, two different signal peptidase I homologs exist in H. volcanii, Sec11a and Sec11b, which likely play distinct physiological roles. Type IV prepilin peptidase PibD processes flagellin/pilin precursors, being essential for the biogenesis and function of the archaellum and other cell surface structures in H. volcanii.

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Citations

Dec 1, 2018·Emerging Topics in Life Sciences·Julie A Maupin-Furlow
Feb 14, 2021·Applied and Environmental Microbiology·Shaoxing ChenHua Xiang
Jan 6, 2018·Journal of Proteome Research·Mariana I CostaMaría I Giménez

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Methods Mentioned

BETA
glycosylation

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