NDLI: Identification of a 71-Kilodalton Surface-Associated Hsp70 Homologue in Coxiella burnetii

Content Provider	PubMed Central
Author	Anna, Macellaro Eva, Tujulin Hjalmarsson, Karin Norlander, Lena
Editor	Barbieri, J. T.
Copyright Year	1998
Abstract	A Coxiella burnetii Hsp70 homologue was identified by using an acid activation in vitro system in which protein synthesis has been followed by [35S]methionine labeling, autoradiography, and immunoblotting. The protein was one of those predominantly labeled, and the immunoblots revealed that it was recognized by anti-DnaK antibodies. The corresponding gene was isolated, and its nucleotide sequence was determined and analyzed. A single open reading frame (ORF) with a size of 1,968 bp was identified. The ORF encodes a protein containing 656 residues and having a molecular weight of 70,800. The −10 promoter sequence was shown to be identical with the consensus heat shock ς32 promoter sequence. The base composition at the presumed −35 region revealed an EcoRI site in the expected region, which is assumed to be located at the border of the cloned fragment. The gene was expressed in Escherichia coli as an intact protein. The C. burnetii 71-kDa protein sequence has a high degree of homology to sequences of the Hsp70 family. A comparison of sequences revealed that the similarity with Hsp70s from other intracellular bacteria, e.g., Legionella pneumophila and Francisella tularensis, as well as E. coli DnaK, is more than 80%. The homologous regions are found in the N-terminal and central parts of the protein sequence, and they include the signature patterns of the Hsp70 family of proteins. The presence of the 71-kDa protein in association with the cell wall as well as in the cytoplasm was demonstrated by the use of immunoelectron microscopy. The dual localization was verified by Western blot analysis of proteins in C. burnetii cell fractions, using purified antibodies directed to the 71-kDa protein.
Starting Page	5882
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	12
Volume Number	66
Language	English
Publisher	American Society for Microbiology
Publisher Date	1998-12-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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