Solution structure and dynamics of Crh, the Bacillus subtilis catabolite repression HPr.Favier, A., Brutscher, B., Blackledge, M., Galinier, A., Deutscher, J., Penin, F., Marion, D.
(2002) J.Mol.Biol. 317: 131-144
- PubMed: 11916384
- DOI: 10.1006/jmbi.2002.5397
- PubMed Abstract:
- Evidence for a Dimerisation State of the Bacillus subtilis Catabolite Repression HPr-like Protein, Crh
Penin, F.,Favier, A.,Montserret, R.,Brutscher, B.,Deutscher, J.,Marion, D.,Galinier, D.
(2001) J.Mol.Microbiol.Biotechnol. 3: 429
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 ...
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.
Jean-Pierre Ebel C.N.R.S.-C.E.A., Institut de Biologie Structurale, 41 rue Jules Horowitz, 38027 Grenoble Cedex, France.