Table 1.

Properties of the Chlamydia trachomatis hsp60

1.	The second most abundant protein in C. trachomatis lysates
2.	Loosely associated with the cell surface (easily removed by gentle washing)
3.	Present in both reticulate bodies and elementary bodies
4.	The only protein produced following induction of a non-culturable persistent state
5.	Released into the extracellular milieu during persistence
6.	48% amino acid sequence homology to the human hsp60
7.	Potent inducer of mononuclear delayed-type hypersensitivity response in animals and humans previously exposed to C. trachomatis
8.	Three genes coding for hsp60 are present—Ct110, Ct604, and Ct755
9.	The three hsp60 genes are expressed independently and differently during active and persistent infections.
10.	Ct110 is the chlamydial homolog of E. coli GroEL.