Biological Properties of N-Acyl and N-Haloacetyl Neuraminic Acids: Processing by Enzymes of Sialic Acid Metabolism, and Interaction with Influenza Virus
摘要:
Several unnatural N-acyl neuraminic acids (N-propionyl, N-hexanoyl, N-benzoyl, N-trifluoroacetyl, N-chloroacetyl, N-difluoroacetyl) were prepared enzymatically using immobilised sialic acid aldolase. N-Trifluoroacetyl- N-chloroacetyl- and N-difluoroacetyl neuraminic acids were shown to enhance up to 10-fold the rate of association of influenza virus A to a sialoglycolipid neomembrane by surface plasmon resonance, and were found to act as weak inhibitors (K-iapp 0.45-2.0 mM) of influenza virus neuraminidase. The N-propionyl, N-chloroacetyl- and N-difluoroacetyl neuraminic acids were found to be substrates for recombinant Escherichia coli CMP sialate synthase, to give the corresponding CMP-N-acyl-neuraminic acids. CMP-N-propionyl neuraminic acid was found not to be a substrate for CMP-N-acetyl neuraminic acid hydroxylase from pig submandibular gland. (C) 2002 Elsevier Science Ltd. All rights reserved.
Methods for purifying sialic acid-specific antibodies and composition comprising affinity-purified antibodies
申请人:The Regents of The University of California
公开号:EP2261255A1
公开(公告)日:2010-12-15
The present invention relates to a method of purifying sialic acid-specific antibodies, comprising the steps of:
(a) preparing antibodies to sialic acids;
(b) contacting the antibodies from step (a) with a first solid phase to which a sialic having a side chain has been attached; and
(c) contacting the antibodies that bound to the first solid phase with a second solid phase to which the sialic acid without the side chain has been attached.
Methods for detecting and analyzing n-glycolylneuraminic acid (Neu5Gc) specific antibodies in biological materials
申请人:The Regents of The University of California
公开号:EP2302390A1
公开(公告)日:2011-03-30
The present invention relates to a method of detecting anti-Neu5Gc specific antibodies in a biological material comprising the steps of:
(a) determining the amount of anti-Neu5Ac antibodies present in the material using Neu5Ac as an antigen target;
(b) determining the amount of anti-Neu5Gc antibodies present in the material using anti-Neu5Gc as an antigen target; and
(c) subtracting the amount of anti-Neu5Ac antibodies from the amount of anti-Neu5Gc antibodies to determine the amount of anti-Neu5Gc specific antibodies.