{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,7]],"date-time":"2026-06-07T05:02:52Z","timestamp":1780808572387,"version":"3.54.1"},"reference-count":50,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2024,9,28]],"date-time":"2024-09-28T00:00:00Z","timestamp":1727481600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"NextGenerationEU","award":["IR0000009"],"award-info":[{"award-number":["IR0000009"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Multiple mitochondrial dysfunctions syndrome type 3 (MMDS3) is a rare autosomal recessive mitochondrial leukoencephalopathy caused by biallelic pathogenic variants in the IBA57 gene. The gene protein product, IBA57, has an unknown role in iron\u2013sulfur (Fe-S) cluster biogenesis but is required for the maturation of mitochondrial [4Fe-4S] proteins. To better understand the role of IBA57 in MMDS3, we have investigated the impact of the pathogenic p.Gly104Cys (c.310G &gt; T) variant on the structural and functional properties of IBA57. The Gly104Cys variant has been associated with a severe MMDS3 phenotype in both compound heterozygous and homozygous states, and defects in the activity of mitochondrial respiratory complexes and lipoic acid-dependent enzymes have been demonstrated in the affected patients. Size exclusion chromatography, also coupled to multiple angle light scattering, NMR, circular dichroism, and fluorescence spectroscopy characterization has shown that the Gly104Cys variant does not impair the conversion of the homo-dimeric [2Fe-2S]\u2013ISCA22 complex into the hetero-dimeric IBA57\u2013[2Fe-2S]\u2013ISCA2 but significantly affects the stability of IBA57, in both its isolated form and in complex with ISCA2, thus providing a rationale for the severe MMDS3 phenotype associated with this variant.<\/jats:p>","DOI":"10.3390\/ijms251910466","type":"journal-article","created":{"date-parts":[[2024,9,30]],"date-time":"2024-09-30T03:12:28Z","timestamp":1727665948000},"page":"10466","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Defects in the Maturation of Mitochondrial Iron\u2013Sulfur Proteins: Biophysical Investigation of the MMDS3 Causing Gly104Cys Variant of IBA57"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6933-7478","authenticated-orcid":false,"given":"Beatrice","family":"Bargagna","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy"},{"name":"Magnetic Resonance Center CERM, University of Florence, Via Luigi Sacconi 6, Sesto Fiorentino, 50019 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6993-4408","authenticated-orcid":false,"given":"Tommaso","family":"Staderini","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy"},{"name":"Magnetic Resonance Center CERM, University of Florence, Via Luigi Sacconi 6, Sesto Fiorentino, 50019 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4369-7082","authenticated-orcid":false,"given":"Steven H.","family":"Lang","sequence":"additional","affiliation":[{"name":"Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA"},{"name":"Texas Children\u2019s Hospital, Houston, TX 77030, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0562-5774","authenticated-orcid":false,"given":"Lucia","family":"Banci","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy"},{"name":"Magnetic Resonance Center CERM, University of Florence, Via Luigi Sacconi 6, Sesto Fiorentino, 50019 Florence, Italy"},{"name":"Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via Luigi Sacconi 6, Sesto Fiorentino, 50019 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4122-4508","authenticated-orcid":false,"given":"Francesca","family":"Camponeschi","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy"},{"name":"Magnetic Resonance Center CERM, University of Florence, Via Luigi Sacconi 6, Sesto Fiorentino, 50019 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Lebigot, E., Schiff, M., and Golinelli-Cohen, M.-P. 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