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However, our understanding of their functions in pathogenic microorganisms remains limited. In this study, we identified and characterized Fmp28, a novel small heat shock protein that enhances virulence in\n                      <jats:italic toggle=\"yes\">Candida albicans<\/jats:italic>\n                      , and explored its regulatory mechanism. The expression of Fmp28 was significantly upregulated at both transcriptional and translational levels when\n                      <jats:italic toggle=\"yes\">C. albicans<\/jats:italic>\n                      was subjected to physiological temperature (37\u00b0C), osmotic stress, or cell wall stress. Deletion of Fmp28 significantly impaired growth, adhesion, biofilm formation, invasive growth, and virulence at physiological temperature (37\u00b0C), respectively. Transcriptome analysis identified Als3 as a key downstream target of Fmp28. Notably, Als3 overexpression substantially rescued the impairments in adhesion, biofilm formation, invasion, and virulence caused by\n                      <jats:italic toggle=\"yes\">FMP28<\/jats:italic>\n                      deletion. Deletion of\n                      <jats:italic toggle=\"yes\">FMP28<\/jats:italic>\n                      also led to downregulated expression of genes in the cAMP-PKA pathway, as well as reduced intracellular ATP and cAMP levels. By adding exogenous cAMP analogs, the adhesion and biofilm formation in the\n                      <jats:italic toggle=\"yes\">fmp28<\/jats:italic>\n                      \u0394\/\u0394 mutant could be partially restored. In conclusion, the findings in this study demonstrated that Fmp28 maintained\n                      <jats:italic toggle=\"yes\">C. albicans<\/jats:italic>\n                      virulence at physiological temperature by regulating Als3 expression through the cAMP-PKA signaling pathway, establishing Fmp28 as a potential therapeutic target for treating\n                      <jats:italic toggle=\"yes\">C. albicans<\/jats:italic>\n                      infections.\n                    <\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>\n                        We have identified Fmp28 as a novel small heat shock protein that is essential for\n                        <jats:italic toggle=\"yes\">C. albicans<\/jats:italic>\n                        adaptation to diverse stresses and full virulence. Furthermore, we elucidated that Fmp28 interacts with Qcr10 on the mitochondria to maintain the concentration of ATP, promoting virulence by regulating Als3 expression via the cAMP-PKA pathway, providing new insights into how\n                        <jats:italic toggle=\"yes\">C. albicans<\/jats:italic>\n                        maintains its stress adaptation and full virulence at a physiological temperature of 37\u00b0C. Our findings established Fmp28 as a potential therapeutic target for treating\n                        <jats:italic toggle=\"yes\">C. albicans<\/jats:italic>\n                        infections, which is particularly relevant, given the rising concern about antifungal resistance.\n                      <\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/mbio.01253-25","type":"journal-article","created":{"date-parts":[[2025,6,30]],"date-time":"2025-06-30T09:01:06Z","timestamp":1751274066000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["A small heat shock protein Fmp28 influences virulence by regulating Als3 expression via the cAMP-PKA signaling pathway in\n                    <i>Candida albicans<\/i>"],"prefix":"10.1128","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-2356-3840","authenticated-orcid":false,"given":"Junjun","family":"Tan","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/042v6xz23","id-type":"ROR","asserted-by":"publisher"}],"name":"The First Affiliated Hospital of Nanchang University and School of Basic Medical sciences, Jiangxi Medical College, Nanchang University","place":["Nanchang, China"]},{"id":[{"id":"https:\/\/ror.org\/042v6xz23","id-type":"ROR","asserted-by":"publisher"}],"name":"Medical Experimental teaching center, School of Basic Medical sciences, Jiangxi Medical College, Nanchang University","place":["Nanchang, 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