title: Chlamydia trachomatis GlgA is secreted into host cell cytoplasm.
abstract: Glycogen has been localized both inside and outside Chlamydia trachomatis organisms. We now report that C. trachomatis glycogen synthase (GlgA) was detected in both chlamydial organism-associated and -free forms. The organism-free GlgA molecules were localized both in the lumen of chlamydial inclusions and in the cytosol of host cells. The cytosolic GlgA displayed a distribution pattern similar to that of a known C. trachomatis-secreted protease, CPAF. The detection of GlgA was specific since the anti-GlgA antibody labeling was only removed by preabsorption with GlgA but not CPAF fusion proteins. GlgA was detectable at 12h and its localization into host cell cytosol only became apparent at 24h after infection. The cytosolic localization of GlgA was conserved among all C. trachomatis serovars. However, the significance of the GlgA secretion into host cell cytoplasm remains unclear since, while expression of chlamydial GlgA in HeLa cells increased glycogen stores, it did not affect a subsequent infection with C. trachomatis. Similar to several other C. trachomatis-secreted proteins, GlgA is immunogenic in women urogenitally infected with C. trachomatis, suggesting that GlgA is expressed and may be secreted into host cell cytosol during C. trachomatis infection in humans. These findings have provided important information for further understanding C. trachomatis pathogenic mechanisms.
authors.affiliation: Department of Pathogen Biology, University of South China, Hengyang, Hunan, China.
authors.forename: Chunxue
authors.initials: C
authors.lastname: Lu
authors.forename: Lei
authors.initials: L
authors.lastname: Lei
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
authors.forename: Lingli
authors.initials: L
authors.lastname: Tang
authors.forename: Honglei
authors.initials: H
authors.lastname: Ding
authors.forename: Siqi
authors.initials: S
authors.lastname: Gong
authors.forename: Zhongyu
authors.initials: Z
authors.lastname: Li
authors.forename: Yimou
authors.initials: Y
authors.lastname: Wu
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhong
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D002692:Chlamydia trachomatis / Q000201:enzymology* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D005455:Fluorescent Antibody Technique; D006003:Glycogen; D006006:Glycogen Synthase / Q000235:genetics / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans
chemical_list: D001426:Bacterial Proteins; D006003:Glycogen; D006006:Glycogen Synthase
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