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Molecular characterization of a bacteriophage (Chp2) from chlamydia psittaci

Liu, B.L., Everson, J., Fane, B., Giannikopoulou, P., Vretou, E., Lambden, P.R. and Clarke, I.N. (2000) Molecular characterization of a bacteriophage (Chp2) from chlamydia psittaci Journal of Virology, 74, (8), pp. 3464-3469. (PMID:8375644).

Record type: Article


Comparisons of the proteome of abortifacient Chlamydia psittaci isolates from sheep by two-dimensional gel electrophoresis identified a novel abundant protein with a molecular mass of 61.4 kDa and an isoelectric point of 6.41. C-terminal sequence analysis of this protein yielded a short peptide sequence that had an identical match to the viral coat protein (VP1) of the avian chlamydiaphage Chp1. Electron microscope studies revealed the presence of a 25-nm-diameter bacteriophage (Chp2) with no apparent spike structures. Thin sections of chlamydia-infected cells showed that Chp2 particles were located to membranous structures surrounding reticulate bodies (RBs), suggesting that Chp2 is cytopathic for ovine C. psittaci RBs. Chp2 double-stranded circular replicative-form DNA was purified and used as a template for DNA sequence analysis. The Chp2 genome is 4,567 bp and encodes up to eight open reading frames (ORFs); it is similar in overall organization to the Chp1 genome. Seven of the ORFs (1 to 5, 7, and 8) have sequence homologies with Chp1. However, ORF 6 has a different spatial location and no cognate partner within the Chp1 genome. Chlamydiaphages have three viral structural proteins, VP1, VP2, and VP3, encoded by ORFs 1 to 3, respectively. Amino acid residues in the phiX174 procapsid known to mediate interactions between the viral coat protein and internal scaffolding proteins are conserved in the Chp2 VP1 and VP3 proteins. We suggest that VP3 performs a scaffolding-like function but has evolved into a structural protein.

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Published date: April 2000


Local EPrints ID: 194177
ISSN: 0022-538X
PURE UUID: 7912c84e-1b1c-4214-8a81-6f4c3504e3e0
ORCID for I.N. Clarke: ORCID iD

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Date deposited: 25 Jul 2011 15:31
Last modified: 18 Jul 2017 11:27

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Author: B.L. Liu
Author: J. Everson
Author: B. Fane
Author: P. Giannikopoulou
Author: E. Vretou
Author: P.R. Lambden
Author: I.N. Clarke ORCID iD

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