Transferases;
Transferring sulfur-containing groups;
Sulfotransferases
BRITE hierarchy

3'-phosphoadenylyl-sulfate:[heparan sulfate]-glucosamine 3-sulfonotransferase

3'-phosphoadenylyl sulfate + [heparan sulfate]-glucosamine = adenosine 3',5'-bisphosphate + [heparan sulfate]-glucosamine 3-sulfate [RN:R05798]

R05798;
(other) R13048
Reaction

3'-phosphoadenylyl sulfate [CPD:C00053];
[heparan sulfate]-glucosamine [CPD:C22549]

Two major substrates contain the tetrasaccharides: -> undetermined 2-sulfo-uronic acid-> GlcN2S-> IdoA2S-> GlcN*-> and -> undetermined 2-sulfo-uronic acid-> GlcN2S-> IdoA2S-> GlcN6S*-> (symbols as in 2-Carb-38) with modification of the N-unsubstituted glucosamine residue (shown with an asterisk) [1,4]. Modification of selected sequences containing N-sulfo-glucosamine residues cannot yet be excluded. The 3-O-sulfated heparan sulfate can be utilized by Herpes simplex virus type 1 as an entry receptor to infect the target cells [2]. There are two isozymes, known as 3-OST-3A and 3-OST-3B, which have identical catalytic domains but are encoded by different mammalian genes [3]. The specificity of this enzyme differs from that of the other [heparan sulfate]-glucosamine 3-sulfotransferases. It is inefficient at modifying precursors of the antithrombin binding site [in contrast to EC 2.8.2.23 ([heparan sulfate]-glucosamine 3-sulfotransferase 1)] and it does not modify glucosamine preceded by GlcA2S [unlike EC 2.8.2.29 ([heparan sulfate]-glucosamine 3-sulfotransferase 2)].

EC 2.8.2.30 created 2001

1  [PMID:10608887]

2  [PMID:10520990]

3  [PMID:9988767]

4  [PMID:9988768]