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C4: Einfluss der N-Glycosylierung der Hüllproteine der HIVSubtypen A, B und C auf die Infektiosität und die Interaktion mit viralen Rezeptoren und Glycoproteinen auf Zellmembranen |
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Keywords: HIV-1; V3 loop; coreceptors; N-glycans; N-glycosylation Binding of HIV-1 gp120 to the coreceptor molecules CCR5 or CXCR4 is necessary for infection of CD4+ cells. During binding the V3 loop region, a heavily glycosylated hypervariable domain of the gp120 protein, interacts with the N-terminal region of the coreceptors. In this project we investigate the role of the V3 loop based N-glycans for CCR5 and CXCR4 interaction. Besides their role for coreceptor binding, the V3 loop based N-glycans are shielding the V3 loop against neutralizing antibodies. Thus, V3 based N-glycans might have two functions (i) masking the V3 loop to prevent binding of neutralizing antibodies and (ii) modulation of the gp120--coreceptor interaction. To investigate the role of N-glycans in the V3 loop region we constructed mutants of R5, X4 and R5X4 tropic HIV-1 strains differing in the presence of N-glycosylation sites. First results demonstrated that those mutants lacking carbohydrates g15, a glycosylation site within the V3 loop, showed markedly higher infectivity for CXCR4+ cells. In addition, the lack of the g15 N-glycan promotes sensitivity against neutralizing antibody. In contrast, mutants containing g15 were resistant to antibody neutralization and showed lower infectivity rates on CXCR4+ cells. Thus N-glycans play a pivotal role in the interaction of HIV with its cellular receptors and in the defense against neutralizing antibodies. Contact:Dr. Michael SchreiberAddress: Bernhard-Nocht-Institut für Tropenmedizin Bernhard-Nocht-Str. 74 20359 Hamburg Telefon: 040-42818 461 Telefax: 040-42818 378 E-Mail: Michael.Schreiber@bni.uni-hamburg.de http://www.bni.uni-hamburg.de/ | ||
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Last Change: 15.02.2004 by Matthias Vill | ||
Contact: Martina Krasa |