A rapid solution immunoassay to quantify binding of the human immunodeficiency virus envelope glycoprotein to soluble CD4.
We developed a particle concentration fluorescent immunoassay to quantify the binding in solution of the human immunodeficiency virus (HIV) external glycoprotein (gp120) to soluble CD4 (sCD4). The assay is rapid (1 hr), quantitative, and requires as little as 0.1 pmole of gp120 per evaluation. We find that gp120, purified from recombinant baculovirus infected insect cells, is suitable for the assay. Moreover, sCD4s obtained either from recombinant E. coli or mammalian cells, consisting of the N-terminal two domains (about 180 amino acids) as well as linked to the active regions of Pseudomonas exotoxin A, bind gp120 similarly.
McQuade
T J
TJ
Cancer and Infectious Diseases Research, Upjohn Company, Kalamazoo, MI 49001.
Pitts
T W
TW
Tarpley
W G
WG
D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D006678:HIV / Q000378:metabolism*; D015699:HIV Envelope Protein gp120; D066298:In Vitro Techniques; D011991:Receptors, Virus / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D012191:Retroviridae Proteins / Q000378:metabolism*; D012995:Solubility; D014759:Viral Envelope Proteins / Q000378:metabolism*
D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D015699:HIV Envelope Protein gp120; D011991:Receptors, Virus; D011994:Recombinant Proteins; D012191:Retroviridae Proteins; D014759:Viral Envelope Proteins