title: Solution structure and dynamics of Crh, the Bacillus subtilis catabolite repression HPr.
abstract: The solution structure and dynamics of the Bacillus subtilis HPr-like protein, Crh, have been investigated using NMR spectroscopy. Crh exhibits high sequence identity (45 %) to the histidine-containing protein (HPr), a phospho-carrier protein of the phosphoenolpyruvate (PEP):carbohydrate phosphotransferase system, but contains no catalytic His15, the site of PEP-dependent phosphorylation in HPr. Crh also forms a mixture of monomers and dimers in solution whereas HPr is known to be monomeric. Complete backbone and side-chain assignments were obtained for the monomeric form, and 60 % of the dimer backbone resonances; allowing the identification of the Crh dimer interface from chemical-shift mapping. The conformation of Crh was determined to a precision of 0.46(+/-0.06) A for the backbone atoms, and 1.01(+/-0.08) A for the heavy atoms. The monomer structure is similar to that of known HPr 2.67(+/-0.22) A (C(alpha) rmsd), but has a few notable differences, including a change in the orientation of one of the helices (B), and a two-residue shift in beta-sheet pairing of the N-terminal strand with the beta4 strand. This shift results in a shortening of the surface loop present in HPr and consequently provides a flatter surface in the region of dimerisation contact, which may be related to the different oligomeric nature of these two proteins. A binding site of phospho-serine(P-Ser)-Crh with catabolite control protein A (CcpA) is proposed on the basis of highly conserved surface side-chains between Crh and HPr. This binding site is consistent with the model of a dimer-dimer interaction between P-Ser-Crh and CcpA. (15)N relaxation measured in the monomeric form also identified differential local mobility in the helix B which is located in the vicinity of this site.
authors.affiliation: Jean-Pierre Ebel C.N.R.S.-C.E.A., Institut de Biologie Structurale, 41 rue Jules Horowitz, 38027 Grenoble Cedex, France.
authors.forename: Adrien
authors.initials: A
authors.lastname: Favier
authors.forename: Bernhard
authors.initials: B
authors.lastname: Brutscher
authors.forename: Martin
authors.initials: M
authors.lastname: Blackledge
authors.forename: Anne
authors.initials: A
authors.lastname: Galinier
authors.forename: Josef
authors.initials: J
authors.lastname: Deutscher
authors.forename: François
authors.initials: F
authors.lastname: Penin
authors.forename: Dominique
authors.initials: D
authors.lastname: Marion
mesh_terms: D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000737:chemistry*; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D001665:Binding Sites; D019281:Dimerization; D007700:Kinetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000737:chemistry*; D010750:Phosphoproteins / Q000737:chemistry* / Q000378:metabolism*; D011485:Protein Binding; D020836:Protein Structure, Quaternary; D017433:Protein Structure, Secondary; D016415:Sequence Alignment; D012996:Solutions
chemical_list: D001426:Bacterial Proteins; C118042:Crh protein, Bacillus subtilis; D010750:Phosphoproteins; D012996:Solutions; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; C030182:phosphocarrier protein HPr