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Journal of Cell Science, Vol 89, Issue 4 467-480, Copyright © 1988 by Company of Biologists
JOURNAL ARTICLES |
WG Whitfield, SE Millar, H Saumweber, M Frasch and DM Glover
Department of Biochemistry, Imperial College of Science and Technology, London, UK.
The monoclonal antibody Bx63 recognizes a centrosomal antigen of Drosophila melanogaster by indirect immunofluorescence and identifies two proteins, with apparent molecular weights of 185 x 10(3) and 66 x 10(3), on Western blots. We have used this antibody to isolate five clones (lambda cs1, -2, -3, -4 and lambda j63) from lambda gt11 expression libraries of Drosophila DNA. Using polyclonal anti-centrosomal sera raised against both immunoaffinity-purified Bx63 antigen and electrophoretically purified fusion protein from clone lambda cs3, we have demonstrated that the fusion proteins encoded by four of these clones (lambda cs1-4) share at least two epitopes with the 185 x 10(3) Mr centrosomal antigen. This indicates that clones lambda cs1-4 contain DNA from the gene coding for this protein. The four clones are independent isolates from a single chromosomal site, which we show by in situ hybridization to correspond with salivary gland chromosome region 88E 4-8. A low-abundance transcript of approximately 4.0 x 10(3) bases corresponding to the cloned gene is detected in all stages of the Drosophila life-cycle.
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