Shin, Sang Chul Im, Sun-Kyoung Jang, Eun-Hae Jin, Kyeong Sik Hur, Eun-Mi Kim, Eunice EunKyeong 2024-01-19T21:01:47Z 2024-01-19T21:01:47Z 2021-09-02 2019-01-29 2211-1247 https://pubs.kist.re.kr/handle/201004/120446 Katanin was the first microtubule (MT)-severing enzyme discovered, but how katanin executes MT severing remains poorly understood. Here, we report X-ray crystal structures of the apo and ATPgS-bound states of the catalytic AAA domain of human katanin p60 at 3.0 and 2.9 angstrom resolution, respectively. Comparison of the two structures reveals conformational changes induced by ATP binding and how such changes ensure hexamer stability. Moreover, we uncover structural details of pore loops (PLs) and show that Arg283, a residue unique to katanin among MT-severing enzymes, protrudes from PL1 and lines the entry of the catalytic pore. Functional studies suggest that PL1 and Arg283 play essential roles in the recognition and remodeling of the glutamylated, C-terminal tubulin tail and regulation of axon growth. In addition, domain-swapping experiments in katanin and spastin suggest that the non-homologous N-terminal region, which contains the MT-interacting and trafficking domain and a linker, confers specificity to the severing process. English CELL PRESS TUBULIN POLYGLUTAMYLASE POSTTRANSLATIONAL MODIFICATIONS IN-VIVO PROTEIN SPASTIN ATPASE RECOGNITION ENZYMES SYSTEM GROWTH Structural and Molecular Basis for Katanin-Mediated Severing of Glutamylated Microtubules Article 10.1016/j.celrep.2019.01.020 1 CELL REPORTS, v.26, no.5, pp.1357 - + CELL REPORTS 26 5 1357 + scie scopus 000456952400023 2-s2.0-85060333245 Cell Biology Cell Biology Article TUBULIN POLYGLUTAMYLASE POSTTRANSLATIONAL MODIFICATIONS IN-VIVO PROTEIN SPASTIN ATPASE RECOGNITION ENZYMES SYSTEM GROWTH AAA ATPase axon growth crystal structure glutamylation katanin microtubule severing