TY - JOUR
T1 - AglF, aglG and aglI, novel members of a gene island involved in the N-glycosylation of the Haloferax volcanii S-layer glycoprotein
AU - Yurist-Doutsch, Sophie
AU - Abu-Qarn, Mehtap
AU - Battaglia, Francesca
AU - Morris, Howard R.
AU - Hitchen, Paul G.
AU - Dell, Anne
AU - Eichler, Jerry
PY - 2008/9/1
Y1 - 2008/9/1
N2 - Proteins in all three domains of life can experience N-glycosylation. The steps involved in the archaeal version of this post-translational modification remain largely unknown. Hence, as the next step in ongoing efforts to identify components of the N-glycosylation pathway of the halophilic archaeon Haloferax volcanii, the involvement of three additional gene products in the biosynthesis of the pentasaccharide decorating the S-layer glycoprotein was demonstrated. The genes encoding AglF, AglI and AglG are found immediately upstream of the gene encoding the archaeal oligosaccharide transferase, AglB. Evidence showing that AglF and AglI are involved in the addition of the hexuronic acid found at position three of the pentasaccharide is provided, while AglG is shown to contribute to the addition of the hexuronic acid found at position two. Given their proximities in the H. volcanii genome, the transcription profiles of aglF, aglI, aglG and aglB were considered. While only aglF and aglI share a common promoter, transcription of the four genes is co-ordinated, as revealed by determining transcript levels in H. volcanii cells raised in different growth conditions. Such changes in N-glycosylation gene transcription levels offer additional support for the adaptive role of this post-translational modification in H. volcanii.
AB - Proteins in all three domains of life can experience N-glycosylation. The steps involved in the archaeal version of this post-translational modification remain largely unknown. Hence, as the next step in ongoing efforts to identify components of the N-glycosylation pathway of the halophilic archaeon Haloferax volcanii, the involvement of three additional gene products in the biosynthesis of the pentasaccharide decorating the S-layer glycoprotein was demonstrated. The genes encoding AglF, AglI and AglG are found immediately upstream of the gene encoding the archaeal oligosaccharide transferase, AglB. Evidence showing that AglF and AglI are involved in the addition of the hexuronic acid found at position three of the pentasaccharide is provided, while AglG is shown to contribute to the addition of the hexuronic acid found at position two. Given their proximities in the H. volcanii genome, the transcription profiles of aglF, aglI, aglG and aglB were considered. While only aglF and aglI share a common promoter, transcription of the four genes is co-ordinated, as revealed by determining transcript levels in H. volcanii cells raised in different growth conditions. Such changes in N-glycosylation gene transcription levels offer additional support for the adaptive role of this post-translational modification in H. volcanii.
UR - http://www.scopus.com/inward/record.url?scp=49249084955&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2958.2008.06352.x
DO - 10.1111/j.1365-2958.2008.06352.x
M3 - Article
C2 - 18631242
AN - SCOPUS:49249084955
SN - 0950-382X
VL - 69
SP - 1234
EP - 1245
JO - Molecular Microbiology
JF - Molecular Microbiology
IS - 5
ER -