Monoclonal antibodies to the M protein of vesicular stomatitis virus (Indiana serotype) and to a cDNA M gene expression product.
Twenty-nine independent hybridomas producing monoclonal antibodies to the matrix (M) protein of vesicular stomatitis virus (Indiana serotype) were prepared by fusion of SP2/0 myeloma cells with spleen lymphocytes obtained from BALB/c mice which had been immunized with the purified M protein. The specific reactivity of each monoclonal antibody was determined by an enzyme-linked immunosorbent assay and a competitive binding assay. Most of the antibodies were of the immunoglobulin G2a and G2b isotypes, although some were immunoglobulin M. By measuring the competitive binding of 125I-antibody, we identified four antigenic determinants in the M protein of the virus; two of these determinants, however, exhibited a large degree of overlap. Western blot analysis revealed little or no cross-reactivity of the antibodies with other viral proteins or with the M protein of the New Jersey serotype. Prolonged trypsin proteolysis removed the first 43 amino acids from the amino-terminal region of the M protein, but it retained its reactivity with monoclonal antibodies to each epitope, except for diminished reactivity with one. To aid in future mapping of these epitopes, we inserted a cDNA clone of the mRNA encoding the M protein of vesicular stomatitis virus into an inducible lac expression vector; the M protein produced in the JM103 strain of Escherichia coli under induced conditions was found to be approximately the same size as native M protein and was recognized by the monoclonal antibodies. These monoclonal antibodies and the cDNA clone should be useful for studying the role of M protein in virus maturation and the regulation of viral transcription.
Pal
R
R
Grinnell
B W
BW
Snyder
R M
RM
Wiener
J R
JR
Volk
W A
WA
Wagner
R R
RR
D000818:Animals; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D003001:Cloning, Molecular; D006224:Cricetinae; D003429:Cross Reactions; D004247:DNA; D000939:Epitopes; D012333:RNA, Messenger / Q000235:genetics; D012703:Serotyping; D014357:Trypsin; D014721:Vesicular stomatitis Indiana virus / Q000032:analysis* / Q000145:classification / Q000235:genetics; D018116:Vesiculovirus; D014763:Viral Matrix Proteins; D014764:Viral Proteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*
D000911:Antibodies, Monoclonal; D000939:Epitopes; D012333:RNA, Messenger; D014763:Viral Matrix Proteins; D014764:Viral Proteins; D004247:DNA; D014357:Trypsin