{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T07:47:29Z","timestamp":1789976849470,"version":"4.0.1"},"reference-count":16,"publisher":"International Union of Crystallography (IUCr)","issue":"2","license":[{"start":{"date-parts":[[2016,1,22]],"date-time":"2016-01-22T00:00:00Z","timestamp":1453420800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},{"start":{"date-parts":[[2016,1,22]],"date-time":"2016-01-22T00:00:00Z","timestamp":1453420800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html#TDM"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr F Struct Biol Commun","Acta Crystallogr F","Acta Crystallogr F Struct Biol Cryst Commun","Acta Cryst F","Acta Cryst F Struct Biol Commun","Acta Cryst Sect F","Acta Cryst Sect F Struct Biol Commun","Acta Crystallogr Sect F","Acta Crystallogr Sect F Struct Biol Commun","Acta Crystallogr Sect F Struct Biol Cryst Commun"],"published-print":{"date-parts":[[2016,2,1]]},"abstract":"<jats:p>Microtubule-associated protein\/microtubule affinity-regulating kinase 4 (MARK4) is a serine\/threonine kinase involved in the phosphorylation of MAP proteins that regulate microtubule dynamics. Abnormal activity of MARK4 has been proposed to contribute to neurofibrillary tangle formation in Alzheimer's disease. The crystal structure of the catalytic and ubiquitin-associated domains of MARK4 with a potent pyrazolopyrimidine inhibitor has been determined to 2.8\u2005\u00c5 resolution with an<jats:italic>R<\/jats:italic><jats:sub>work<\/jats:sub>of 22.8%. The overall structure of MARK4 is similar to those of the other known MARK isoforms. 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