title: Crystallization and preliminary crystallographic analysis of human Atg4B-LC3 complex.
abstract: The reversible modification of Atg8 with phosphatidylethanolamine (PE) is crucial for autophagy, the bulk degradation process of cytoplasmic components by the vacuolar/lysosomal system. Atg4 is a cysteine protease that is responsible for the processing and deconjugation of Atg8. Human Atg4B (HsAtg4B; a mammalian orthologue of yeast Atg4) and LC3 (a mammalian orthologue of yeast Atg8) were expressed and purified and two complexes, one consisting of HsAtg4B(1-354) and LC3(1-120) (complex I; the product complex) and the other consisting of HsAtg4B(1-354) and LC3(1-124) (complex II; the substrate complex), were crystallized using polyethylene glycol 3350 as a precipitant. In both complexes His280 of HsAtg4B was mutated to alanine. The crystals belong to the same space group P2(1)2(1)2(1), with unit-cell parameters a = 47.5, b = 91.8, c = 102.6 A for complex I and a = 46.9, b = 90.9, c = 102.5 A for complex II. Diffraction data were collected to a resolution of 1.9 A from both crystals.
authors.affiliation: Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Hokkaido University, N-12, W-6, Kita-ku, Sapporo 060-0812, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Satoo
authors.forename: Nobuo N
authors.initials: NN
authors.lastname: Suzuki
authors.forename: Yuko
authors.initials: Y
authors.lastname: Fujioka
authors.forename: Noboru
authors.initials: N
authors.lastname: Mizushima
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Ohsumi
authors.forename: Fuyuhiko
authors.initials: F
authors.lastname: Inagaki
mesh_terms: D000071183:Autophagy-Related Proteins; D003460:Crystallization; D018360:Crystallography, X-Ray; D003546:Cysteine Endopeptidases / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D008869:Microtubule-Associated Proteins / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000071183:Autophagy-Related Proteins; C477012:MAP1LC3A protein, human; D008869:Microtubule-Associated Proteins; C507524:ATG4B protein, human; D003546:Cysteine Endopeptidases