Fusion activity of influenza virus. A comparison between biological and artificial target membrane vesicles.

We have investigated the pH-dependent fusion activity of influenza virus toward human erythrocyte ghosts, utilizing a recently developed fluorescence assay, which permits continuous monitoring of the fusion reaction. The rate of fusion is negligible at neutral pH but shows a sharp increase at pH values just below 5.5. This pH dependence profile closely corresponds to that of virus-induced hemolysis. Fusion is rapidly inactivated by a low-pH preincubation of the virus alone either at 37 or at 0 degrees C. The presence of ghosts during this low-pH preincubation, carried out at 0 degree C under which condition there is hardly any fusion, causes a significant protection of the viral fusion activity against inactivation. Fusion initiated at low pH can be arrested instantaneously by readjustment of the pH to neutral. The characteristics of fusion of influenza virus with ghosts deviate from those of fusion with cardiolipin liposomes (Stegmann, T., Hoekstra, D., Scherphof, G., and Wilschut, J. (1985) Biochemistry 24, 3107-3113). Fusion with ghosts is consistent with a requirement of the well-documented pH-dependent conformational change in the viral hemagglutinin, whereas fusion with cardiolipin liposomes does not exhibit a strict dependence on the conformational change. Rather, the negative surface charge on the liposomes plays a critical role, as zwitterionic liposomes containing gangliosides show fusion behavior similar to that of erythrocyte ghosts.

• Publication year

  1986

• Venue

  Journal of Biological Chemistry

• Publication date

  1986-08-25

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(18)67334-xPMID 3733744
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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