{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T21:11:39Z","timestamp":1790802699693,"version":"4.1.0"},"reference-count":174,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,8,15]],"date-time":"2025-08-15T00:00:00Z","timestamp":1755216000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Microbiol."],"abstract":"<jats:p>Protein Kinases (PKs) are a large family of enzymes that act as \u201cmolecular switches,\u201d playing fundamental role in cellular signaling through protein phosphorylation. This process consists in transfer a phosphate group (<jats:italic>\u03b3<\/jats:italic>-PO\u2084<jats:sup>2\u2212<\/jats:sup>) from ATP (adenosine triphosphate) to specific residues in target proteins; thereby, controlling vital cellular processes, such as (i) cell proliferation and differentiation, (ii) response to environmental stimuli (stress, nutrients, hormones), (iii) metabolism, (iv) cell cycle and apoptosis, and (v) signal transduction. Among fungi, adaptability is intrinsically connected to their ability to thrive under extreme environmental stress, being morphological plasticity an example of this adaptability. While many of these adaptive responses are regulated by diverse signaling pathways involving different kinase families, as mitogen-activated protein kinase (MAPK) for example, this review places a special focus on the General Control Nonderepressible 2 kinase (GCN2), a highly conserved sensor of amino acid scarcity in many fungi, as well as the species <jats:italic>Cryptococcus neoformans<\/jats:italic>, <jats:italic>Candida albicans<\/jats:italic>, and <jats:italic>Aspergillus fumigatus<\/jats:italic>. Amino acid deprivation triggers the accumulation of uncharged tRNAs, which directly activate GCN2, and this activation leads to the phosphorylation of the eukaryotic initiation factor 2 alpha (<jats:italic>eIF2\u03b1<\/jats:italic>) at the serine in the position 51, initiating the Integrated Stress Response (ISR). Phosphorylated <jats:italic>eIF2\u03b1<\/jats:italic> suppresses global translation initiation while selectively enhancing the translation of stress-responsive genes, notably GCN4, which encodes a transcription factor that promotes amino acid biosynthesis and stress adaptation. In <jats:italic>Cryptococcus neoformans<\/jats:italic>, GCN2 emerges as the sole kinase responsible for <jats:italic>eIF2\u03b1<\/jats:italic> phosphorylation, a unique role in modulating translational responses to environmental and host-induced stressors. Previous studies have shown that the absence of GCN2 disrupts <jats:italic>eIF2\u03b1<\/jats:italic> phosphorylation, impairing stress responses and reducing pathogenicity, therefore being an important target for development of new generation antifungals. To better understand the mechanistic role of GCN2 and related kinases in amino acid sensing and stress response, we present a review based on studying the central role of kinases in fungal stress adaptation, discussing how the high conservation of their catalytic kinase domains makes them valuable as phylogenetic markers and therapeutic targets.<\/jats:p>","DOI":"10.3389\/fmicb.2025.1630196","type":"journal-article","created":{"date-parts":[[2025,8,15]],"date-time":"2025-08-15T05:28:30Z","timestamp":1755235710000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":8,"title":["The protein kinases family in fungi: adaptability, virulence and conservation between species"],"prefix":"10.3389","volume":"16","author":[{"given":"Emanoelle","family":"La Santrer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cl\u00e1udia Barbosa","family":"Assun\u00e7\u00e3o","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thiago Miguelito Navarro","family":"de Camargo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Izabella","family":"Rodrigues","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabrina Sidney","family":"Campolina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edgar Lacerda","family":"de Aguiar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thiago","family":"de Souza Rodrigues","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel Basques","family":"Caligiorne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,8,15]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"959","DOI":"10.1016\/j.joi.2017.08.007","article-title":"Bibliometrix: an R-tool for comprehensive science mapping analysis","volume":"11","author":"Aria","year":"2017","journal-title":"J. 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