1887

Abstract

Human immunodeficiency virus type 1 has several genetic subtypes and two coreceptor use phenotypes: R5 that uses CCR5, while X4 uses CXCR4. A high amino acid charge of the envelope glycoprotein 120 V3 region, common at positions 11 and 25, is important for CXCR4 use. We characterized charged V3 amino acids, retrieving all biologically phenotyped sequences from the HIV Sequence Database. Selecting individually unique ones randomly yielded 48 subtype A, 231 B, 180 C, 37 D and 32 CRF01_AE sequences; 482 were R5 and 46 were X4. Charged amino acids were conserved in both R5 and X4 with general and subtype-specific patterns. X4 viruses gained a higher charge from positive amino acids at positions other than in R5, and through the loss of negative amino acids. Other positions than 11/25 had a greater impact on charge (<0.001). This describes how R5 evolves into X4 in a subtype-specific context, useful for computer-based predictions and vaccine design.

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2011-08-01
2020-01-22
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Supplements

vol. , part 8, pp. 1917 - 1922

Flow chart of the sequence selection process

Subtype-specific distributions of the R5 and X4 phenotypes [Single PDF file](1,302 KB)

 



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