The 18-kDa lectin-binding protein of Chlamydia trachomatis is different from the 18-kDa histone-like protein.

Five proteins of Chlamydia trachomatis at the 18,000 (18-kDa) molecular mass region were resolved by two-dimensional electrophoresis. Three proteins at 18.2 kDa, pI 6.9, 18.0 kDa, pI 6.3, and 17.9 kDa, pI 6.4 were shown to bind lectin. A fourth protein of 18.0 kDa at pI 10 was the histone-like protein. The fifth protein at 17.9 kDa, pI 7.0 was not characterized.