title: Crystal and solution structure of the C-terminal part of the Methanocaldococcus jannaschii A1AO ATP synthase subunit E revealed by X-ray diffraction and small-angle X-ray scattering.
abstract: The structure of the C-terminus of subunit E (E(101-206)) of Methanocaldococcus jannaschii A-ATP synthase was determined at 4.1 A. E(101-206) consist of a N-terminal globular domain with three alpha-helices and four antiparallel beta-strands and an alpha-helix at the very C-terminus. Comparison of M. jannaschii E(101-206) with the C-terminus E(81-198) subunit E from Pyrococcus horikoshii OT3 revealed that the kink in the C-terminal alpha-helix of E(81-198), involved in dimer formation, is absent in M. jannaschii E(101-206). Whereas a major dimeric surface interface is present between the P. horikoshii E(81-198) molecules in the asymmetric unit, no such interaction could be found in the M. jannaschii E(101-206) molecules. To verify the oligomeric behaviour, the low resolution structure of the recombinant E(85-206) from M. jannaschii was determined using small angle X-ray scattering. Rigid body modeling of two copies of one of the monomer established a fit with a tail to tail arrangement.
authors.affiliation: School of Biological Sciences, Nanyang Technological University, Singapore, Republic of Singapore.
authors.forename: Asha Manikkoth
authors.initials: AM
authors.lastname: Balakrishna
authors.forename: Malathy Sony Subramanian
authors.initials: MS
authors.lastname: Manimekalai
authors.forename: Cornelia
authors.initials: C
authors.lastname: Hunke
authors.forename: Shovanlal
authors.initials: S
authors.lastname: Gayen
authors.forename: Manfred
authors.initials: M
authors.lastname: Rössle
authors.forename: Jeyaraman
authors.initials: J
authors.lastname: Jeyakanthan
authors.forename: Gerhard
authors.initials: G
authors.lastname: Grüber
mesh_terms: D025181:ATP Synthetase Complexes / Q000737:chemistry*; D000595:Amino Acid Sequence; D019843:Archaeal Proteins / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D017016:Methanococcaceae / Q000201:enzymology*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D021122:Protein Subunits; D053838:Scattering, Small Angle; D012996:Solutions; D014961:X-Ray Diffraction
chemical_list: D019843:Archaeal Proteins; D021122:Protein Subunits; D012996:Solutions; D025181:ATP Synthetase Complexes