title: Hybrid structural model of the complete human ESCRT-0 complex.
abstract: The human Hrs and STAM proteins comprise the ESCRT-0 complex, which sorts ubiquitinated cell surface receptors to lysosomes for degradation. Here we report a model for the complete ESCRT-0 complex based on the crystal structure of the Hrs-STAM core complex, previously solved domain structures, hydrodynamic measurements, and Monte Carlo simulations. ESCRT-0 expressed in insect cells has a hydrodynamic radius of RH = 7.9 nm and is a 1:1 heterodimer. The 2.3 Angstroms crystal structure of the ESCRT-0 core complex reveals two domain-swapped GAT domains and an antiparallel two-stranded coiled-coil, similar to yeast ESCRT-0. ESCRT-0 typifies a class of biomolecular assemblies that combine structured and unstructured elements, and have dynamic and open conformations to ensure versatility in target recognition. Coarse-grained Monte Carlo simulations constrained by experimental RH values for ESCRT-0 reveal a dynamic ensemble of conformations well suited for diverse functions.
authors.affiliation: Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892, USA.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Ren
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Kloer
authors.forename: Young C
authors.initials: YC
authors.lastname: Kim
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Ghirlando
authors.forename: Layla F
authors.initials: LF
authors.lastname: Saidi
authors.forename: Gerhard
authors.initials: G
authors.lastname: Hummer
authors.forename: James H
authors.initials: JH
authors.lastname: Hurley
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry* / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D002850:Chromatography, Gel; D018360:Crystallography, X-Ray; D056827:Endosomal Sorting Complexes Required for Transport; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009010:Monte Carlo Method; D010750:Phosphoproteins / Q000737:chemistry* / Q000378:metabolism; D020349:Surface Plasmon Resonance; D025801:Ubiquitin / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D056827:Endosomal Sorting Complexes Required for Transport; D010750:Phosphoproteins; C109775:STAM protein, human; D025801:Ubiquitin; C096164:hepatocyte growth factor-regulated tyrosine kinase substrate