5HEV
Crystal Structure of the beryllofluoride-activated LiaR from Enterococcus faecium
Summary for 5HEV
| Entry DOI | 10.2210/pdb5hev/pdb |
| Related | 4IF4 |
| Descriptor | Response regulator protein VraR, MAGNESIUM ION, BERYLLIUM TRIFLUORIDE ION (3 entities in total) |
| Functional Keywords | enterococcus faecium, liar, response regulator, transcription |
| Biological source | Enterococcus faecium SD3B-2 |
| Total number of polymer chains | 4 |
| Total formula weight | 95098.50 |
| Authors | Davlieva, M.,Shamoo, Y. (deposition date: 2016-01-06, release date: 2016-11-16, Last modification date: 2023-09-27) |
| Primary citation | Davlieva, M.,Tovar-Yanez, A.,DeBruler, K.,Leonard, P.G.,Zianni, M.R.,Arias, C.A.,Shamoo, Y. An Adaptive Mutation in Enterococcus faecium LiaR Associated with Antimicrobial Peptide Resistance Mimics Phosphorylation and Stabilizes LiaR in an Activated State. J.Mol.Biol., 428:4503-4519, 2016 Cited by PubMed Abstract: The cyclic antimicrobial lipopeptide daptomycin (DAP) triggers the LiaFSR membrane stress response pathway in enterococci and many other Gram-positive organisms. LiaR is the response regulator that, upon phosphorylation, binds in a sequence-specific manner to DNA to regulate transcription in response to membrane stress. In clinical settings, non-susceptibility to DAP by Enterococcus faecium is correlated frequently with a mutation in LiaR of Trp73 to Cys (LiaR). We have determined the structure of the activated E. faecium LiaR protein at 3.2Å resolution and, in combination with solution studies, show that the activation of LiaR induces the formation of a LiaR dimer that increases LiaR affinity at least 40-fold for the extended regulatory regions upstream of the liaFSR and liaXYZ operons. In vitro, LiaR induces phosphorylation-independent dimerization of LiaR and provides a biochemical basis for non-susceptibility to DAP by the upregulation of the LiaFSR regulon. A comparison of the E. faecalis LiaR, E. faecium LiaR, and the LiaR homolog from Staphylococcus aureus (VraR) and the mutations associated with DAP resistance suggests that physicochemical properties such as oligomerization state and DNA specificity, although tuned to the biology of each organism, share some features that could be targeted for new antimicrobials. PubMed: 27670715DOI: 10.1016/j.jmb.2016.09.016 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (3.192 Å) |
Structure validation
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