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After growth of six strains of mycobacteria on Sauton medium in the absence of added Zn2+, cell yields were lowered, to between 22% and 67% of the yields obtained when Zn2+ (5 microM) was added. Two immunodominant proteins, named P64 and P32 (antigens of 62-65 kDa and 29-33 kDa, respectively) were abundant in culture filtrates after growth of mycobacteria. P64 was present at elevated concentrations (showing a 9- to 16-fold increase as a percentage of the total protein released) after Zn2+-deficient growth of five of the six strains studied; in Mycobacterium tuberculosis it represented 25% of all released proteins. However, little P64 was detected in culture filtrates of M. fortuitum and of M. phlei grown under Zn2+ deficiency, and in the latter there was no increase of P64 during Zn2+ deficiency.

Effect of Zinc Deficiency on the Appearance of Two Immunodominant Protein Antigens (32 kDa and 65 kDa) in Culture Filtrates of Mycobacteria