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1 Department of Microbiology and Immunology, Yamaguchi University School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi 755-8505, Japan
2 Department of Clinical Research, National Sanyo Hospital, 685 Higashi-Kiwa, Ube, Yamaguchi 755-0241, Japan
Correspondence
Yoshinao Azuma
yazuma{at}yamaguchi-u.ac.jp
Mutsunori Shirai
mshirai{at}yamaguchi-u.ac.jp
SET domain genes have been identified in numbers of bacterial genomes based on similarity to SET domains of eukaryotic histone methyltransferases. Herein, a Chlamydophila pneumoniae SET domain gene was clarified to be coincidently expressed with hctA and hctB genes encoding chlamydial histone H1-like proteins, Hc1 and Hc2, respectively. The SET domain protein (cpnSET) is localized in chlamydial cells and interacts with Hc1 and Hc2 through the C-terminal SET domain. As expected from conservation of catalytic sites in cpnSET, it functions as a protein methyltransferase to murine histone H3 and Hc1. However, little is known about protein methylation in the molecular pathogenesis of chlamydial infection. cpnSET may play an important role in chlamydial cell maturation due to modification of chlamydial histone H1-like proteins.
A supplementary table and three supplementary figures are available with the online version of this paper.
Present address: Department of Veterinary Biosciences, the Ohio State University, 1900 Coffey Rd, Columbus, OH 43210, USA.
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