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Gonadotropins - from genes to recombinant proteins
Elizur, A.; Zmora, N.; Meiri, I.; Kasuto, H.; Rosenfeld, H.; Kobayashi, M.; Zohar, Y.; Yaron, Z. (2000). Gonadotropins - from genes to recombinant proteins, in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 462-465
In: Norberg, B. et al. (Ed.) (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., more
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales, more

Available in  Authors 
    VLIZ: Proceedings [4371]

Keyword
    Marine

Authors  Top 
  • Elizur, A.
  • Zmora, N.
  • Meiri, I.
  • Kasuto, H.
  • Rosenfeld, H.
  • Kobayashi, M.
  • Zohar, Y.
  • Yaron, Z.

Abstract
    We have cloned the cDNAs encoding for the LH and FSH beta -subunits from a number of commercially important fish species, including seabream, mullet, tilapia and black carp. The cDNAs were used as probes to study gonadotropin gene expression, to isolate corresponding genes and to produce recombinant proteins. For the latter, beta LH and beta FSH cDNA sequences were introduced into both bacterial and baculovirus expression systems. The bacterial system yielded milligram amounts of recombinant proteins that were refolded in vitro, yet still gave a non-parallel response in an immunoassay compared to the native hormone. Antibodies against these recombinant proteins were used in western blots and ICC, but could not identify blood circulating levels of LH or FSH. The recombinant gonadotropins produced by the baculovirus expression system appear to be immunologically similar to the native hormones, as judged by their parallelism in immunoassays. The difficulties associated with this system are the low levels of production and purification from the culture media.

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