Linked Life Data

8760499

Source:http://linkedlifedata.com/resource/pubmed/id/8760499

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pubmed-article:8760499pubmed:abstractTextCryptococcus neoformans is an encapsulated fungus that causes a life-threatening meningoencephalitis in patients with AIDS. Monoclonal antibodies to the capsular glucuronoxylomannan can modulate the infection in mice, but the epitopes on this complex polysaccharide recognized by protective and non-protective antibodies have not been defined. We have used 2H1, one of our most protective antibodies, to screen phage display peptide libraries for peptide mimotopes that would allow us to explore the fine specificity of anti-cryptococcal polysaccharide antibodies. Hexa- and decapeptides have been identified with sequence homologies that define four motifs: 1, (E)TPXWM/LM/L; 2, W/YXWM/ LYE; 3, DWXDW; and 4, (Ar)WDGQ(Ar). Peptides representing these motifs compete with each other for a shared binding site that overlaps the polysaccharide binding site. Motifs 1 and 2 confer high affinity binding, and PA1, which displays a motif 1 peptide with the sequence LQYTPSWMLV, binds to 2H1 with a Kd of 295 nM. Analysis of the interaction between the 2H1 binding peptides and 24 structurally related anti-polysaccharide antibodies reveals a complex pattern of reactivity that strongly suggests binding to or close to the complementary determining regions. Furthermore, those antibodies that have been shown to have different specificity, and in some cases different protective potential, do not bind any of the peptides selected by the protective 2H1 antibody. This study shows that peptide mimotopes for a complex microbial polysaccharide can be identified by screening phage peptide libraries and demonstrates the usefulness of such peptides in analyzing closely related interactive sites of proteins in general and of antibodies in particular.lld:pubmed
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pubmed-article:8760499pubmed:articleTitlePeptide libraries define the fine specificity of anti-polysaccharide antibodies to Cryptococcus neoformans.lld:pubmed
pubmed-article:8760499pubmed:affiliationDepartment of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.lld:pubmed
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pubmed-article:8760499pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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