Ubiquitin-like small archaeal modifier proteins (SAMPs) in Haloferax volcanii

Matthew A. Humbard, Hugo V. Miranda, Jae-Min Lim, David J. Krause, Jonathan R. Pritz, Guangyin Zhou, Sixue Chen, Lance Wells and Julie A. Maupin-Furlow ()
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Matthew A. Humbard: Department of Microbiology and Cell Science,
Hugo V. Miranda: Department of Microbiology and Cell Science,
Jae-Min Lim: Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, USA
David J. Krause: Department of Microbiology and Cell Science,
Jonathan R. Pritz: Department of Microbiology and Cell Science,
Guangyin Zhou: Department of Microbiology and Cell Science,
Sixue Chen: University of Florida, Gainesville, Florida 32611, USA
Lance Wells: Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, USA
Julie A. Maupin-Furlow: Department of Microbiology and Cell Science,

Nature, 2010, vol. 463, issue 7277, 54-60

Abstract: Abstract Archaea, one of three major evolutionary lineages of life, encode proteasomes highly related to those of eukaryotes. In contrast, archaeal ubiquitin-like proteins are less conserved and not known to function in protein conjugation. This has complicated our understanding of the origins of ubiquitination and its connection to proteasomes. Here we report two small archaeal modifier proteins, SAMP1 and SAMP2, with a β-grasp fold and carboxy-terminal diglycine motif similar to ubiquitin, that form protein conjugates in the archaeon Haloferax volcanii. The levels of SAMP-conjugates were altered by nitrogen-limitation and proteasomal gene knockout and spanned various functions including components of the Urm1 pathway. LC-MS/MS-based collision-induced dissociation demonstrated isopeptide bonds between the C-terminal glycine of SAMP2 and the ε-amino group of lysines from a number of protein targets and Lys 58 of SAMP2 itself, revealing poly-SAMP chains. The widespread distribution and diversity of pathways modified by SAMPylation suggest that this type of protein conjugation is central to the archaeal lineage.

Date: 2010
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DOI: 10.1038/nature08659

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