title: Partial site-specific assignment of a uniformly (13)C, (15)N enriched membrane protein, light-harvesting complex 1 (LH1), by solid state NMR.
abstract: Partial site-specific assignments are reported for the solid state NMR spectra of light-harvesting complex 1, a 160 kDa integral membrane protein. The assignments were derived from 600 MHz (15)N-(13)CO-(13)Calpha and (15)N-(13)Calpha-(13)CX correlation spectra, using uniformly (13)C, (15)N enriched hydrated material, in an intact and precipitated form. Sequential assignments were verified using characteristic (15)N-(13)Calpha-(13)Cbeta side chain chemical shifts observed in 3D experiments. Tertiary contacts found in 2D DARR spectra of the selectively (13)C enriched sample provided further confirmatory evidence for the assignments. The assignments include the region of the Histidine ligands binding the Bacteriochlorophyll chromophore. The chemical shifts of Calpha and Cbeta resonances indicated the presence of typical alpha-helical secondary structure, consistent with previous studies.
authors.affiliation: Key Laboratory of Molecular Engineering of Polymers of the Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, China. leihuang@fudan.edu.cn
authors.forename: Lei
authors.initials: L
authors.lastname: Huang
authors.forename: Ann E
authors.initials: AE
authors.lastname: McDermott
mesh_terms: D000595:Amino Acid Sequence; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry*; D008565:Membrane Proteins / Q000737:chemistry*; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D017433:Protein Structure, Secondary; D012242:Rhodobacter sphaeroides / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D045342:Light-Harvesting Protein Complexes; D008565:Membrane Proteins