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. 1991 Feb;65(2):852–860. doi: 10.1128/jvi.65.2.852-860.1991

Differential loss of envelope glycoprotein gp120 from virions of human immunodeficiency virus type 1 isolates: effects on infectivity and neutralization.

J A McKeating 1, A McKnight 1, J P Moore 1
PMCID: PMC239825  PMID: 1898972

Abstract

Several parameters which may affect the infectivity of human immunodeficiency virus type 1 in tissue culture were analyzed. In particular, we used gel exclusion chromatography to investigate how the loss of the surface glycoprotein gp120 from virions of the HTLV-IIIB (IIIB), HTLV-IIIRF (RF), and SF-2 isolates modulates infectivity. In IIIB and RF cultures, a high proportion of the total gp120 was virion bound initially but was gradually lost from the virions over time. In contrast, most of the gp120 (and p24) in SF-2-infected cultures was soluble and the few particles present had a fivefold-lower level of virus-bound gp120. However, this reduced level of virion-bound gp120 was more resistant to shedding. Loss of a major proportion of gp120 from IIIB and RF virions resulted in reduced infectivities, and in addition, the resulting accumulation of soluble gp120 in the cultures could competitively inhibit viral infection, especially with SF-2. Increased shedding of virion gp120 also affected the neutralization of IIIB and RF particles. However, the high sensitivity to human serum neutralization characteristic of SF-2 was unaffected by soluble gp120 in cultures, suggesting that the epitopes responsible are not present on soluble gp120.

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Selected References

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