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Differential recognition of the Multiple Banded Antigen isoforms across Ureaplasma parvum and Ureaplasma urealyticum species by monoclonal antibodies

Aboklaish, Ali, Ahmed, S., McAllister, D., Cassell, G., Zheng, X. and Spiller, Owen Bradley 2016. Differential recognition of the Multiple Banded Antigen isoforms across Ureaplasma parvum and Ureaplasma urealyticum species by monoclonal antibodies. Journal of Microbiological Methods 127 , pp. 13-19. 10.1016/j.mimet.2016.05.015

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Two separate species of Ureaplasma have been identified that infect humans: Ureaplasma parvum and Ureaplasma urealyticum. Most notably, these bacteria lack a cell wall and are the leading infectious organism associated with infection-related induction of preterm birth. Fourteen separate representative prototype bacterial strains, called serovars, are largely differentiated by the sequence of repeating units in the C-terminus of the major surface protein: multiple-banded antigen (MBA). Monoclonal antibodies that recognise single or small groups of serovars have been previously reported, but these reagents remain sequestered in individual research laboratories. Here we characterise a panel of commercially available monoclonal antibodies raised against the MBA and describe the first monoclonal antibody that cross-reacts by immunoblot with all serovars of U. parvum and U. urealyticum species. We also describe a recombinant MBA expressed by Escherichia coli which facilitated further characterisation by immunoblot and demonstrate immunohistochemistry of paraffin-embedded antigens. Immunoblot reactivity was validated against well characterised previously published monoclonal antibodies and individual commercial antibodies were found to recognise all U. parvum strains, only serovars 3 and 14 or only serovars 1 and 6, or all strains belonging to U. parvum and U. urealyticum. MBA mass was highly variable between strains, consistent with variation in the number of C-terminal repeats between strains. Antibody characterisation will enable future investigations to correlate severity of pathogenicity to MBA isoform number or mass, in addition to development of antibody-based diagnostics that will detect infection by all Ureaplasma species or alternately be able to differentiate between U. parvum, U. urealyticum or mixed infections.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > RG Gynecology and obstetrics
Uncontrolled Keywords: Ureaplasma parvum; Ureaplasma urealyticum; Multiple banded antigen; Recombinant protein
Publisher: Elsevier
ISSN: 0167-7012
Date of First Compliant Deposit: 24 October 2016
Date of Acceptance: 24 May 2016
Last Modified: 26 Apr 2020 14:16

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