title: Identification of a novel ubiquitin binding site of STAM1 VHS domain by NMR spectroscopy.
abstract: Interaction between the signal-transducing adapter molecule 1 (STAM1) Vps27/Hrs/Stam (VHS) domain and ubiquitin was investigated by nuclear magnetic resonance (NMR) spectroscopy. NMR evidence showed that the structure of STAM1 VHS domain resembles that of other VHS domains, especially the homologous domain of STAM2. We found that the VHS domain binds to ubiquitin via its hydrophobic patch consisting of N-terminus of helix 2 and C-terminus of helix 4 in which Trp26 on helix 2 plays a pivotal role in the binding. The binding between VHS and ubiquitin seems to be very similar to that between ubiquitin associated domain (UBA) and ubiquitin, however, the direction of alpha-helices involved in the ubiquitin binding is opposite. Here, we propose a novel ubiquitin binding site and the manner of ubiquitin recognition of the STAM1 VHS domain.
authors.affiliation: Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea.
authors.forename: Yoon-Hun
authors.initials: YH
authors.lastname: Hong
authors.forename: Hee-Chul
authors.initials: HC
authors.lastname: Ahn
authors.forename: Jongsoo
authors.initials: J
authors.lastname: Lim
authors.forename: Hong-Man
authors.initials: HM
authors.lastname: Kim
authors.forename: Hye-Young
authors.initials: HY
authors.lastname: Ji
authors.forename: Seunga
authors.initials: S
authors.lastname: Lee
authors.forename: Ji-Hun
authors.initials: JH
authors.lastname: Kim
authors.forename: Eun Young
authors.initials: EY
authors.lastname: Park
authors.forename: Hyun Kyu
authors.initials: HK
authors.lastname: Song
authors.forename: Bong-Jin
authors.initials: BJ
authors.lastname: Lee
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D001665:Binding Sites; D056827:Endosomal Sorting Complexes Required for Transport; D006801:Humans; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D054730:Protein Interaction Domains and Motifs / Q000235:genetics; D025941:Protein Interaction Mapping; D017433:Protein Structure, Secondary; D014364:Tryptophan / Q000378:metabolism; D025801:Ubiquitin / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D056827:Endosomal Sorting Complexes Required for Transport; D010750:Phosphoproteins; C109775:STAM protein, human; D025801:Ubiquitin; D014364:Tryptophan