2M2J: Solution NMR structure of the N-terminal domain of STM1478 from Salmonella typhimurium LT2: Target STR147A of the Northeast Structural Genomics consortium (NESG), and APC101565 of the Midwest Center for Structural Genomics (MCSG)

Citation:
Abstract
Bacterial species in the Enterobacteriaceae typically contain multiple paralogues of a small domain of unknown function (DUF1471) from a family of conserved proteins also known as YhcN or BhsA/McbA. Proteins containing DUF1471 may have a single or three copies of this domain. Representatives of this family have been demonstrated to play roles in several cellular processes including stress response, biofilm formation, and pathogenesis. We have conducted NMR and X-ray crystallographic studies of four DUF1471 domains from Salmonella representing three different paralogous DUF1471 subfamilies: SrfN, YahO, and SssB/YdgH (two of its three DUF1471 domains: the N-terminal domain I (residues 21-91), and the C-terminal domain III (residues 244-314)). Notably, SrfN has been shown to have a role in intracellular infection by Salmonella Typhimurium. These domains share less than 35% pairwise sequence identity. Structures of all four domains show a mixed alpha+beta fold that is most similar to that of bacterial lipoprotein RcsF. However, all four DUF1471 sequences lack the redox sensitive cysteine residues essential for RcsF activity in a phospho-relay pathway, suggesting that DUF1471 domains perform a different function(s). SrfN forms a dimer in contrast to YahO and SssB domains I and III, which are monomers in solution. A putative binding site for oxyanions such as phosphate and sulfate was identified in SrfN, and an interaction between the SrfN dimer and sulfated polysaccharides was demonstrated, suggesting a direct role for this DUF1471 domain at the host-pathogen interface.
PDB ID: 2M2JDownload
MMDB ID: 109780
PDB Deposition Date: 2012/12/21
Updated in MMDB: 2014/08
Experimental Method:
solution nmr
Source Organism:
Similar Structures:
Biological Unit for 2M2J: monomeric; determined by author
Molecular Components in 2M2J
Label Count Molecule
Protein (1 molecule)
1
Putative Periplasmic Protein
Molecule annotation
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