{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T13:26:13Z","timestamp":1767965173263,"version":"3.49.0"},"reference-count":71,"publisher":"Public Library of Science (PLoS)","issue":"10","license":[{"start":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T00:00:00Z","timestamp":1633910400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001700","name":"Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan","doi-asserted-by":"crossref","award":["17H01679"],"award-info":[{"award-number":["17H01679"]}],"id":[{"id":"10.13039\/501100001700","id-type":"DOI","asserted-by":"crossref"}]},{"name":"The International Priority Graduate Programs scholarship"},{"name":"Japan Society for the Promotion of Science under Grants-in-Aid for Scientific Research","award":["18K19436"],"award-info":[{"award-number":["18K19436"]}]},{"name":"Japan Society for the Promotion of Science under Grants-in-Aid for Scientific Research","award":["18K14672"],"award-info":[{"award-number":["18K14672"]}]},{"name":"World-leading Innovative and Smart Education"},{"DOI":"10.13039\/501100004532","name":"Japan International Cooperation Agency","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100004532","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100004532","name":"Japan International Cooperation Agency","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100004532","id-type":"DOI","asserted-by":"crossref"}]},{"name":"The Japan Initiative for Global Research Network on Infectious Diseases","award":["JP19fm0108008"],"award-info":[{"award-number":["JP19fm0108008"]}]},{"name":"The Japan Initiative for Global Research Network on Infectious Diseases","award":["JP19fm0108008"],"award-info":[{"award-number":["JP19fm0108008"]}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>Anthrax is a zoonotic disease caused by the gram-positive spore-forming bacterium<jats:italic>Bacillus anthracis<\/jats:italic>. Detecting naturally acquired antibodies against anthrax sublethal exposure in animals is essential for anthrax surveillance and effective control measures. Serological assays based on protective antigen (PA) of<jats:italic>B<\/jats:italic>.<jats:italic>anthracis<\/jats:italic>are mainly used for anthrax surveillance and vaccine evaluation. Although the assay is reliable, it is challenging to distinguish the naturally acquired antibodies from vaccine-induced immunity in animals because PA is cross-reactive to both antibodies. Although additional data on the vaccination history of animals could bypass this problem, such data are not readily accessible in many cases. In this study, we established a new enzyme-linked immunosorbent assay (ELISA) specific to antibodies against capsule biosynthesis protein CapA antigen of<jats:italic>B<\/jats:italic>.<jats:italic>anthracis<\/jats:italic>, which is non-cross-reactive to vaccine-induced antibodies in horses. Using<jats:italic>in silico<\/jats:italic>analyses, we screened coding sequences encoded on pXO2 plasmid, which is absent in the veterinary vaccine strain Sterne 34F2 but present in virulent strains of<jats:italic>B<\/jats:italic>.<jats:italic>anthracis<\/jats:italic>. Among the 8 selected antigen candidates, capsule biosynthesis protein CapA (GBAA_RS28240) and peptide ABC transporter substrate-binding protein (GBAA_RS28340) were detected by antibodies in infected horse sera. Of these, CapA has not yet been identified as immunoreactive in other studies to the best of our knowledge. Considering the protein solubility and specificity of<jats:italic>B<\/jats:italic>.<jats:italic>anthracis<\/jats:italic>, we prepared the C-terminus region of CapA, named CapA322, and developed CapA322-ELISA based on a horse model. Comparative analysis of the CapA322-ELISA and PAD1-ELISA (ELISA uses domain one of the PA) showed that CapA322-ELISA could detect anti-CapA antibodies in sera from infected horses but was non-reactive to sera from vaccinated horses. The CapA322-ELISA could contribute to the anthrax surveillance in endemic areas, and two immunoreactive proteins identified in this study could be additives to the improvement of current or future vaccine development.<\/jats:p>","DOI":"10.1371\/journal.pone.0258317","type":"journal-article","created":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T19:44:17Z","timestamp":1633981457000},"page":"e0258317","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":2,"title":["Development of ELISA based on Bacillus anthracis capsule biosynthesis protein CapA for naturally acquired antibodies against anthrax"],"prefix":"10.1371","volume":"16","author":[{"given":"Tuvshinzaya","family":"Zorigt","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4710-1389","authenticated-orcid":true,"given":"Yoshikazu","family":"Furuta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manyando","family":"Simbotwe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akihiro","family":"Ochi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mai","family":"Tsujinouchi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Misheck","family":"Shawa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomoko","family":"Shimizu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norikazu","family":"Isoda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jargalsaikhan","family":"Enkhtuya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5370-7865","authenticated-orcid":true,"given":"Hideaki","family":"Higashi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2021,10,11]]},"reference":[{"key":"pone.0258317.ref001","author":"CJ 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