摘要:
The invention describes the identification of a major neutralization site of hepatitis E virus (HEV) and the use of this neutralization site in methods of vaccination and in methods of screening for neutralizing antibodies to HEV. The invention also describes the isolation and characterization of neutralizing chimpanzee monoclonal antibodies reactive to the neutralization site and the use of these antibodies in the diagnosis, treatment and prevention of HEV.
摘要:
A strain of hepatitis E virus from Pakistan (SAR-55) implicated in an epidemic of enterically transmitted non-A, non-B hepatitis, now called hepatitis E, is disclosed. The invention relates to the expression of the whole structural region of SAR-55, designated open reading frame 2 (ORF-2), in a eukaryotic expression system. The expressed protein is capable of forming HEV virus-like particles which can serve as an antigen in diagnostic immunoassays and as an immunogen or vaccine to protect against infection by hepatitis E.
摘要:
Chimpanzee monoclonal antibodies and antigen binding fragments including a γ1-chain CDR3 region that bind hepatitis A virus (HAV) antigen are disclosed herein. The antibodies neutralize HAV. Also disclosed are methods for using these antibodies and antigen binding fragments in the detection of hepatitis A virus, the inhibition of infection of a subject with hepatitis A virus, and in screening for agents that affect HAV.
摘要:
A method is described whereby new cDNA or RNA sequences can be introduced into or substituted for cDNA in any chosen position without specific sequence requirements using the polymerase chain reaction (PCR). The method entails the use of primers which are complementary to the 3' and 5' ends of the desired sequence to be inserted as well as to the 3' and 5' ends of the chosen site of insertion in the acceptor molecule. The desired sequence is amplified by PCR such that single stranded fragments are produced. The single stranded fragment of the desired sequence is then annealed to a single stranded acceptor molecule at the site of insertion and extended to produce a double stranded molecule. The double stranded molecule is then separated into two strands which are identical except that one of the strands contains the desired sequence inserted at the chosen site. A second double stranded molecule is then generated.