Structural analysis of the sulfotransferase (3-o-sulfotransferase isoform 3) involved in the biosynthesis of an entry receptor for herpes simplex virus 1.
Heparan sulfate (HS) plays essential roles in assisting herpes simplex virus infection and other biological processes. The biosynthesis of HS includes numerous specialized sulfotransferases that generate a variety of sulfated saccharide sequences, conferring the selectivity of biological functions of HS. We report a structural study of human HS 3-O-sulfotransferase isoform 3 (3-OST-3), a key sulfotransferase that transfers a sulfuryl group to a specific glucosamine in HS generating an entry receptor for herpes simplex virus 1. We have obtained the crystal structure of 3-OST-3 at 1.95 A in a ternary complex with 3'-phosphoadenosine 5'-phosphate and a tetrasaccharide substrate. Mutational analyses were also performed on the residues involved in the binding of the substrate. Residues Gln255 and Lys368 are essential for the sulfotransferase activity and lie within hydrogen bonding distances to the carboxyl and sulfo groups of the uronic acid unit. These residues participate in the substrate recognition of 3-OST-3. This structure provides atomic level evidence for delineating the substrate recognition and catalytic mechanism for 3-OST-3.
Moon
Andrea F
AF
Laboratories of Structural Biology, NIEHS, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA.
Edavettal
Suzanne C
SC
Krahn
Joe M
JM
Munoz
Eva M
EM
Negishi
Masahiko
M
Linhardt
Robert J
RJ
Liu
Jian
J
Pedersen
Lars C
LC
D000595:Amino Acid Sequence; D001665:Binding Sites; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D018360:Crystallography, X-Ray; D004252:DNA Mutational Analysis; D005973:Glutamine / Q000737:chemistry; D018259:Herpesvirus 1, Human / Q000378:metabolism*; D006801:Humans; D006860:Hydrogen Bonding; D007477:Ions; D007700:Kinetics; D008239:Lysine / Q000737:chemistry; D008956:Models, Chemical; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D010957:Plasmids / Q000737:chemistry / Q000378:metabolism; D011134:Polysaccharides / Q000737:chemistry; D011485:Protein Binding; D011487:Protein Conformation; D020033:Protein Isoforms; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D015238:Sulfotransferases / Q000737:chemistry*
D007477:Ions; D011134:Polysaccharides; D020033:Protein Isoforms; D005973:Glutamine; D015238:Sulfotransferases; D008239:Lysine