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TonB-dependent transporters (TBDTs) are bacterial outer membrane proteins that internalize nutrients such as vitamin B12, metal complexes, heme, some carbohydrates, etc. In addition to their transport activity, several TBDTs are also involved in a signalling cascade from the cell surface into the cytoplasm, via their periplasmic signalling domain. Here we report the backbone and side chain resonance assignments of the signalling domain of HasR, a TonB-dependent outer membrane heme transporter from Serratia marcescens as a first step towards its structural study. [ABSTRACT FROM AUTHOR]

Most of microbes hijack the cellular machinery to their advantage by interacting with specific target of the host cell. Glycoprotein of rabies virus is a key factor controlling the homeostasis of infected neuronal cells and proteins belonging to the human microtubule associated serine threonine kinase family have been identified as potential cellular partners. As a first step towards its structural study, we have assigned the backbone and side chain nuclei resonances of the PDZ domain (PSD-95, Discs Large, ZO-1) of MAST205 in complex with the C-terminal residues of the glycoprotein of rabies virus. The BMRB accession code is 155972. [ABSTRACT FROM AUTHOR]

The backbone and side chain resonance assignments of the periplasmic domain of HasB, the energy transducer for heme active transport through the specific receptor HasR of Serratia marcescens, have been determined as a first step towards its structural study. The BMRB accession code is 15440. [ABSTRACT FROM AUTHOR]

The human protein tyrosine phosphatase non-receptor type 3 (PTPN3) is a PDZ (PSD-95/Dlg/ZO-1) domain-containing phosphatase with a tumor-suppressive or a tumor-promoting role in many cancers. Interestingly, the high-risk genital human papillomavirus (HPV) types 16 and 18 target the PDZ domain of PTPN3. The presence of a PDZ binding motif (PBM) on E6 confers interaction with a number of different cellular PDZ domain-containing proteins and is a marker of high oncogenic potential. Here, we report the molecular basis of interaction between the PDZ domain of PTPN3 and the PBM of the HPV E6 protein. We combined biophysical, NMR and X-ray experiments to investigate the structural and functional properties of the PDZ domain of PTPN3. We showed that the C-terminal sequences from viral proteins encompassing a PBM interact with PTPN3-PDZ with similar affinities to the endogenous PTPN3 ligand MAP kinase p38γ. PBM binding stabilizes the PDZ domain of PTPN3. We solved the X-ray structure of the PDZ domain of PTPN3 in complex with the PBM of the HPV E6 protein. The crystal structure and the NMR chemical shift mapping of the PTPN3-PDZ/peptide complex allowed us to pinpoint the main structural determinants of recognition of the C-terminal sequence of the E6 protein and the long-range perturbations induced upon PBM binding. [ABSTRACT FROM AUTHOR]

Presents a letter to the editor about gallium protoporphyrin.