Insights into the N-sulfation mechanism: molecular dynamics simulations of the N-sulfotransferase domain of NDST1 and mutants.

ABSTRACT: Sulfation patterns along glycosaminoglycan (GAG) chains dictate their functional role. The N-deacetylase N-sulfotransferase family (NDST) catalyzes the initial downstream modification of heparan sulfate and heparin chains by removing acetyl groups from subsets of N-acetylglucosamine units and, subsequently, sulfating the residual free amino groups. These enzymes transfer the sulfuryl group from 3'-phosphoadenosine-5'-phosphosulfate (PAPS), yielding sulfated sugar chains and 3'-phosphoadenosine-5'-phosphate (PAP). For the N-sulfotransferase domain of NDST1, Lys833 has been implicated to play a role in holding the substrate glycan moiety close to the PAPS cofactor. Additionally, Lys833 together with His716 interact with the sulfonate group, stabilizing the transition state. Such a role seems

SUBMITTER: Gesteira TF 

PROVIDER: S-EPMC3733922 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature