TY - JOUR
T1 - SRD5A3 Is Required for Converting Polyprenol to Dolichol and Is Mutated in a Congenital Glycosylation Disorder
AU - Cantagrel, Vincent
AU - Lefeber, Dirk J.
AU - Ng, Bobby G.
AU - Guan, Ziqiang
AU - Silhavy, Jennifer L.
AU - Bielas, Stephanie L.
AU - Lehle, Ludwig
AU - Hombauer, Hans
AU - Adamowicz, Maciej
AU - Swiezewska, Ewa
AU - De Brouwer, Arjan P.
AU - Blümel, Peter
AU - Sykut-Cegielska, Jolanta
AU - Houliston, Scott
AU - Swistun, Dominika
AU - Ali, Bassam R.
AU - Dobyns, William B.
AU - Babovic-Vuksanovic, Dusica
AU - van Bokhoven, Hans
AU - Wevers, Ron A.
AU - Raetz, Christian R.H.
AU - Freeze, Hudson H.
AU - Morava, Éva
AU - Al-Gazali, Lihadh
AU - Gleeson, Joseph G.
PY - 2010/7
Y1 - 2010/7
N2 - N-linked glycosylation is the most frequent modification of secreted and membrane-bound proteins in eukaryotic cells, disruption of which is the basis of the congenital disorders of glycosylation (CDGs). We describe a new type of CDG caused by mutations in the steroid 5α-reductase type 3 (SRD5A3) gene. Patients have mental retardation and ophthalmologic and cerebellar defects. We found that SRD5A3 is necessary for the reduction of the alpha-isoprene unit of polyprenols to form dolichols, required for synthesis of dolichol-linked monosaccharides, and the oligosaccharide precursor used for N-glycosylation. The presence of residual dolichol in cells depleted for this enzyme suggests the existence of an unexpected alternative pathway for dolichol de novo biosynthesis. Our results thus suggest that SRD5A3 is likely to be the long-sought polyprenol reductase and reveal the genetic basis of one of the earliest steps in protein N-linked glycosylation.
AB - N-linked glycosylation is the most frequent modification of secreted and membrane-bound proteins in eukaryotic cells, disruption of which is the basis of the congenital disorders of glycosylation (CDGs). We describe a new type of CDG caused by mutations in the steroid 5α-reductase type 3 (SRD5A3) gene. Patients have mental retardation and ophthalmologic and cerebellar defects. We found that SRD5A3 is necessary for the reduction of the alpha-isoprene unit of polyprenols to form dolichols, required for synthesis of dolichol-linked monosaccharides, and the oligosaccharide precursor used for N-glycosylation. The presence of residual dolichol in cells depleted for this enzyme suggests the existence of an unexpected alternative pathway for dolichol de novo biosynthesis. Our results thus suggest that SRD5A3 is likely to be the long-sought polyprenol reductase and reveal the genetic basis of one of the earliest steps in protein N-linked glycosylation.
KW - Chembio
KW - Humdisease
UR - http://www.scopus.com/inward/record.url?scp=77955057089&partnerID=8YFLogxK
U2 - 10.1016/j.cell.2010.06.001
DO - 10.1016/j.cell.2010.06.001
M3 - Article
C2 - 20637498
AN - SCOPUS:77955057089
SN - 0092-8674
VL - 142
SP - 203
EP - 217
JO - Cell
JF - Cell
IS - 2
ER -