{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,30]],"date-time":"2026-03-30T09:12:45Z","timestamp":1774861965178,"version":"3.50.1"},"reference-count":79,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2026,3,28]],"date-time":"2026-03-28T00:00:00Z","timestamp":1774656000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"NSF-IOS\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t              https:\/\/ror.org\/01rvays47","award":["#1759034"],"award-info":[{"award-number":["#1759034"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Yeast models are widely used to study molecular chaperones from diverse organisms, including plants, because of their well-characterized genetics and the conservation of the protein-folding machinery among eukaryotes. Cross-species complementation studies in yeast have yielded valuable insights into conserved biochemical activity and molecular functions that manage protein folding, assembly, and repair during stress. This study evaluated the functional capacity of three potato StBiP isoforms (StBiP1, StBiP2, and StBiP3) to complement the kar2 deletion (kar2\u0394) strain under a range of environmental and ER stress conditions. All three StBiPs partially restored colony growth under normal conditions, demonstrating that they are functional orthologs of yeast KAR2 and can support core ER housekeeping functions. Under severe stress, however, the isoforms diverged: StBiP3 most effectively complemented the kar2\u0394 strain during heat- and chemically induced ER stress, whereas StBiP1 and StBiP2 provided weaker protection. Unfolded protein response (UPR) activation, monitored via HAC1 mRNA splicing, further highlighted isoform-specific differences in how the StBiPs support IRE1-HAC1 signaling under ER stress and oxidative stress. A conserved cysteine in the nucleotide-binding domain, previously implicated in Kar2 redox control, was also critical for StBiP3-mediated protection in yeast, although the same mutation led to different consequences in plant tissues. Together, these findings provide evidence of subfunctionalization among potato BiP isoforms, with StBiP3 emerging as a stress-specialized chaperone that is a promising target for improving ER stress resilience in solanaceous crops.<\/jats:p>","DOI":"10.3390\/ijms27073094","type":"journal-article","created":{"date-parts":[[2026,3,30]],"date-time":"2026-03-30T08:22:36Z","timestamp":1774858956000},"page":"3094","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Functional Characterization of Solanum tuberosum ER Lumen Binding Protein (StBiP) Genes Through Complementation in Yeast kar2 Deletion Mutants"],"prefix":"10.3390","volume":"27","author":[{"given":"Binita","family":"Adhikari","sequence":"first","affiliation":[{"name":"Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77845, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Donna M.","family":"Gordon","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Mississippi State University, Mississippi State, MS 39762, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8789-3144","authenticated-orcid":false,"given":"Jeanmarie","family":"Verchot","sequence":"additional","affiliation":[{"name":"Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77845, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1223","DOI":"10.1016\/0092-8674(89)90059-7","article-title":"Cerevisiae Encodes an Essential Protein Homologous in Sequence and Function to Mammalian BiP","volume":"57","author":"Normington","year":"1989","journal-title":"Cell"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1211","DOI":"10.1016\/0092-8674(89)90058-5","article-title":"KAR2, a Karyogamy Gene, Is the Yeast Homolog of the Mammalian BiP\/GRP78 Gene","volume":"57","author":"Rose","year":"1989","journal-title":"Cell"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"e41168","DOI":"10.7554\/eLife.41168","article-title":"Inadequate BiP Availability Defines Endoplasmic Reticulum Stress","volume":"8","author":"Vitale","year":"2019","journal-title":"Elife"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1186\/1475-2859-13-22","article-title":"Generation of Human ER Chaperone BiP in Yeast Saccharomyces cerevisiae","volume":"13","author":"Slibinskas","year":"2014","journal-title":"Microb. 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