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J Biol Chem, Vol. 274, Issue 25, 17828-17836, June 18, 1999
Multiple p44 Genes Encoding Major Outer Membrane
Proteins Are Expressed in the Human Granulocytic Ehrlichiosis
Agent
Ning
Zhi,
Norio
Ohashi, and
Yasuko
Rikihisa
From the Department of Veterinary Biosciences, College of
Veterinary Medicine, The Ohio State University,
Columbus, Ohio 43210-1093
Human granulocytic ehrlichiosis (HGE) is caused
by infection with an obligatory intracellular bacterium, the HGE agent.
We previously cloned a gene encoding HGE agent 44-kDa major outer membrane protein and designated it p44. In this study, we
(i) identified five different mRNAs that are transcribed from
p44-homologous genes in the HGE agent cultivated in HL-60
cells; (ii) cloned genes corresponding to the mRNAs from the
genomic DNA of the HGE agent; (iii) showed that the genes being
expressed were not clustered in the HGE agent genome; (iv) estimated
that a minimum copy number of the p44-homologous genes in
the genome is 18; (v) detected two different P44-homologous proteins
expressed by the HGE agent; and (vi) demonstrated existence of
antibodies specific to the two proteins in sera from patients with HGE.
These findings showed that p44 multigenes have several
active expression sites and the expression is regulated at
transcriptional level, suggesting a potentially unique mechanism for
generating the diversity in major antigenic outer membrane proteins of
the HGE agent. Characterization of p44-homologous genes
expressed by the HGE agent in a tissue culture would assist in
understanding a role of the p44 multigene family in
pathogenesis and immune response in HGE.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 1999 by the American Society for Biochemistry and Molecular Biology.
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