Volume 76, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


To detect IgG antibody in the serodiagnosis of visceral leishmaniasis (VL), a recombinant antigen rK39, which is part of a kinesin-related protein, has been used successfully and showed high sensitivity and specificity. We report production of a recombinant protein rKRP42, which is part of an kinesin-related protein and a homolog of rK39, and its application in an enzyme-linked immunosorbent assay (ELISA) for the diagnosis of VL. When rKRP42 and rK39 were compared, amino acid sequence analysis showed 89.3% identity and 98.7% homology, with rKRP42 having 39 more amino acids than rK39. The ELISA using rKRP42 showed a sensitivity of 94.6% (70 positive samples among 74 from VL patients) and a specificity of 99.3% (148 negative samples among 149 samples from Japanese controls), whereas the sensitivity of the commercial rK39 dipstick test was 93.2% (69 positive samples among 74 from patients with VL). The rKRP42 is a promising new antigen in developing immunodiagnostic methods for VL.


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  • Received : 01 Sep 2006
  • Accepted : 18 Jan 2007

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