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• W2092851520 abstract "We previously demonstrated that the naturally occurring splice variant stromal cell-derived factor 1gamma/CXCL12gamma is the most potent CXCL12 isoform in blocking X4 HIV-1, with weak chemotactic activity. A conserved BBXB domain (B for basic and X for any residue) located in the N terminus ((24)KHLK(27)) is found in all six isoforms of CXCL12. To determine whether the potent antiviral activity of CXCL12gamma is due to the presence of the extra C-terminal BBXB domains, we mutated each domain individually as well as in combination. Although binding of CXCL12gamma to heparan sulfate proteoglycan (HSPG) was 10-fold higher than that observed with CXCL12alpha, the results did not demonstrate a direct correlation between HSPG binding and the potent antiviral activity. CXCL12gamma mutants lacking the conserved BBXB domain (designated gammaB1) showed increased binding to HSPG but reduced anti-HIV activity. In contrast, the mutants lacking the C-terminal second and/or third BBXB domain but retaining the conserved domain (designated B2, B3, and B23) showed decreased binding to HSPG but increased anti-HIV activity. The B2, B3, and B23 mutants were associated with enhanced CXCR4 binding, receptor internalization, and restored chemotaxis. Internalization of CXCR4 was more potent with CXCL12gamma than with CXCL12alpha and was significantly reduced when the conserved BBXB domain was mutated. We concluded that the observed potent anti-HIV-1 activity of CXCL12gamma is due to increased affinity for CXCR4 and to efficient receptor internalization." @default.
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• W2092851520 date "2010-03-01" @default.
• W2092851520 modified "2023-10-06" @default.
• W2092851520 title "The Potent Anti-HIV Activity of CXCL12γ Correlates with Efficient CXCR4 Binding and Internalization" @default.
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• W2092851520 doi "https://doi.org/10.1128/jvi.00342-09" @default.
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