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. 1990 Jun;172(6):2862–2870. doi: 10.1128/jb.172.6.2862-2870.1990

Isolation and characterization of a Treponema pallidum major 60-kilodalton protein resembling the groEL protein of Escherichia coli.

L S Houston 1, R G Cook 1, S J Norris 1
PMCID: PMC209082  PMID: 1971618

Abstract

A native structure containing the major 60-kilodalton common antigen polypeptide (designated TpN60) was isolated from Treponema pallidum subsp. pallidum (Nichols strain) through a combination of differential centrifugation and sucrose density gradient sedimentation. Gel filtration chromatography indicated that this structure is a high-molecular-weight homo-oligomer of TpN60. Antisera to TpN60 reacted with the groEL polypeptide of Escherichia coli, as determined by immunoperoxidase staining of two-dimensional electroblots. Electron microscopy of the isolated complex revealed a ringlike structure with a diameter of approximately 16 nm which was very similar in appearance to the groEL protein. Comparison of the N-terminal amino acid sequence of TpN60 with the deduced sequences of the E. coli groEL protein, related chaperonin proteins from mycobacteria and Coxiella burnetti, the hsp60 protein of Saccharomyces cerevisiae, the wheat ribulose bisphosphate carboxylase-oxygenase-subunit-binding protein (alpha subunit), and the human P1 mitochondrial protein indicated sequence identity at 8 of 22 to 10 of 22 residues (36 to 45% identity). We conclude that the oligomer of TpN60 is homologous to the groEL protein and related chaperonins found in a wide variety of procaryotes and eucaryotes and thus may represent a heat shock protein involved in protein folding and assembly.

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Selected References

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