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Volume 41, Issue 3

Purification and partial characterisation of a novel 66-kDa seroreactive protein of HRv Free

Abstract

Summary

A seroreactive protein (TB66) was purified from culture filtrate (CF) and cell sonicate (CS) of HRv by immobilised metal affinity chromatography (IMAC) on a Ni-nitrilotriacetic acid (NTA) column. The TB66 preparations obtained by IMAC contained predominantly a 66-kDa protein with a pI of 5.5 as determined by two-dimensional electrophoresis. TB66 was detected in the CF as early as 1 week of growth of HRv. The NH-terminal amino-acid sequence showed 85 % homology with the N-terminal sequence of bovine serum albumin (BSA) and 80 % homology with human serum albumin. Amino-acid analysis indicated a difference in the amino-acid content of TB66 when compared to BSA, with an abundance of acidic amino acids. A monoclonal antibody (MAb) OD4AG3, raised in this laboratory against an complex (MAC 101) sonicate cross-reacting with HRv sonicate, recognised a heat-stable and trypsin-sensitive epitope of this protein. TB66 was also recognised by MAbs IT1 and IT20 which also react with the 14-kDa antigen of the complex. Antibodies against TB66 were present in the sera of 62 of 64 patients with tuberculosis; sera from normal healthy individuals showed no significant reactivity. TB66 appears to be a predominant secretory protein of and could play an important role in the pathogenesis of this organism.

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© 1994 The Pathological Society of Great Britain and Ireland
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1994-09-01
2024-04-20
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Purification and partial characterisation of a novel 66-kDa seroreactive protein of Mycobacterium tuberculosis H37Rv
J. Med. Microbiol. 41, 173 (1994); https://doi.org/10.1099/00222615-41-3-173
/content/journal/jmm/10.1099/00222615-41-3-173
/content/journal/jmm/10.1099/00222615-41-3-173
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