The gene for a 28-kDa Mycobacterium leprae protein Ag, a major target of antibodies from patients with lepromatous leprosy, was cloned from a lambda-gt11-M. leprae DNA expression library and sequenced. Antibodies to this protein were detected in the serum of the majority of 15 individual lepromatous patients that were tested. The predicted amino acid sequence of the 28-kDa protein suggests that it is localized to the bacterial plasma membrane or cell wall.
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Cherayil et al. (1988) studied this question.