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Recombinant production of anti-HIV protein, griffithsin, by auto-induction in a fermentor culture

  1. Author:
    Giomarelli, B.
    Schumacher, K. M.
    Taylor, T. E.
    Sowder, R. C.
    Hartley, J. L.
    McMahon, J. B.
    Mori, T.

  2. Author Address

    NCI, Mol Targets Dev Program, Canc Res Ctr, Frederick, MD 21702 USA. NCI, Werner H Kirsten Student Internship Program, Canc Res Ctr, Frederick, MD 21702 USA. SAIC, Res Technol Program, Prot Express Lab, Frederick, MD 21702 USA. SAIC, AIDS Vaccine Program, Frederick, MD 21702 USA Mori, T, Takeda Pharmaceut Co Ltd, Div Pharmaceut Res, Biomed Res Labs, Yodogawa Ku, 2-17-85,Jusohonmachi, Osaka 5328686, Japan
    1. Year: 2006
    2. Date: MAY
  2. Journal: Protein Expression and Purification
    1. 47
    2. 1
    3. Pages: 194-202
  4. Type of Article: Article
  1. Abstract:

    Griffithsin (GRFT) is a novel anti-HIV protein isolated from the red alga Griffithia sp. The potent anti-viral activity of GRFT against both laboratory and primary isolates of HIV at picomolar concentrations makes this protein an attractive candidate microbicide to prevent sexual transmission of HIV. Here, we describe the recombinant production and purification of a biologically active hexa-histidine-tagged GRFT (His-GRFT) from Escherichia coli. To facilitate a large-scale production of recombinant His-GRFT, we tested different expression conditions to optimize the expression in the cytoplasm of E coli to increase the overall production of soluble His-GRFT. Attempts to express His-GRFT in shake flask cultures resulted in a modest yield of soluble His-GRFT, with a large accumulation of the protein in inclusion bodies. The use of a fermenter and of a rich, auto-inducing medium allowed the total amount of His-GRFT per liter to be increased by about 45-fold, with approximately 70% of the protein expressed in the soluble fraction. N-terminal sequencing and MALDI-TOF analyses of the recombinant His-GRFT confirmed that the initial methionine residue was cleaved off. Recombinant His-GRFT showed equivalent activity with natural GRFT,. both in respect to gp120-binding characteristics as well as anti-HIV activity. Size-exclusion chromatography analysis showed that both native GRFT and recombinant His-GRFT existed as homodimers in solution. The expression system described in this work provides a basis for the mass production of GRIFT to allow further studies of the protein and investigation of therapeutic and preventive strategies against HIV. Published by Elsevier Inc

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  2. DOI: 10.1016/j.pep.2005.10.014
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Library Notes

  1. Student Author
NCI at Frederick

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