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Biochemical and immunological characterization of exometabolites from an Indian strain of Leishmania donovani promastigotes grown in a chemically defined medium

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Summary

Exometabolites (EXOM) of an Indian strain of Leishmania donovani promastigotes isolated from a chemically defined medium by ultrafiltration consisted of proteins, glycoproteins, lipid and lipophosphopolysaccharide (LPPS). LPPS of Mr 40-28 kDa in SDS-PAGE could be labelled metabolically with [32P]-phosphate and recovered in the aqueous phase of hot-phenol-water extraction of EXOM (PE-Aq) along with a glycoprotein of Mr 150-130 kDa (GP150-130) . These two molecules could be eluted from DE-52 column with 200 mM NaCI (D2). The 300 mM NaCl (D3) and 400 mM NaCl (D4) eluates from DE-52 column contained one unsaturated polar lipid component. The LPPS had Rf value of 0.65–0.75 in Thin Layer Chromatography (TLC) using saturated phenol water solvent system. EXOM revealed 15 bands in SDS-PAGE of which proteins of Mr 84, 66, 56, 50 and 29 kDa were prominent. When EXOM were fractionated through Con A — Sepharose column, the fraction eluted with α-methyl-D-mannoside (Con A-E) had seven bands as revealed by SDS-PAGE of which 25, 16, 13 and 12 kDa glycoproteins were prominent.

The antigens present in EXOM can be classified as slower anodic migrating and faster anodic migrating antigens as revealed by immunoelectrophoresis (IEP). The slower anodic migrating antigens, LPPS and GP150-130 recovered in PE-Aq and D2 did not cross-react with kala- azar patients' sera but cross-reacted with homologous anti-promastigote sera. Two faster anodic migrating antigens which could be recovered in organic phase of hot phenol extraction of EXOM (PE-O) and eluted in D3 and D4 and Con A-E, cross-reacted with kala-azar patients' sera. The antigens of both the classes were sensitive to periodic acid oxidation.

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Authors and Affiliations

  1. Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, 700019, Calcutta

    Kalipada Karl & Amal Bhattacharya

  2. Indian Institute of Chemical Biology, Leishmania Group, 4, Raja S. C. Mullick Road, 700032, Calcutta, India

    Krishna Mukerji, Sujata Kar, Dwijen Sarkar & Dilip Kumar Ghosh

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  1. Kalipada Karl
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  2. Krishna Mukerji
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  5. Amal Bhattacharya
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Karl, K., Mukerji, K., Kar, S. et al. Biochemical and immunological characterization of exometabolites from an Indian strain of Leishmania donovani promastigotes grown in a chemically defined medium. Mol Cell Biochem 108, 157–167 (1991). https://doi.org/10.1007/BF00233121

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  • DOI: https://doi.org/10.1007/BF00233121

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