Solution Structure and Chemical Shift Assignments for the Apo form of the Receiver Domain of Nitrogen Regulatory Protein C (NTRC) at 35CSolution Structure and Chemical Shift Assignments for the Apo form of the Receiver Domain of Nitrogen Regulatory Protein C (NTRC) at 35C

Structural highlights

2msl is a 1 chain structure with sequence from Salmonella enterica subsp. enterica serovar Typhimurium str. UK-1. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

A0A0M3KKS6_SALTU

Publication Abstract from PubMed

The interconversion between inactive and active protein states, traditionally described by two static structures, is at the heart of signalling. However, how folded states interconvert is largely unknown due to the inability to experimentally observe transition pathways. Here we explore the free energy landscape of the bacterial response regulator NtrC by combining computation and nuclear magnetic resonance, and discover unexpected features underlying efficient signalling. We find that functional states are defined purely in kinetic and not structural terms. The need of a well-defined conformer, crucial to the active state, is absent in the inactive state, which comprises a heterogeneous collection of conformers. The transition between active and inactive states occurs through multiple pathways, facilitated by a number of nonnative transient hydrogen bonds, thus lowering the transition barrier through both entropic and enthalpic contributions. These findings may represent general features for functional conformational transitions within the folded state.

Free energy landscape of activation in a signalling protein at atomic resolution.,Pontiggia F, Pachov DV, Clarkson MW, Villali J, Hagan MF, Pande VS, Kern D Nat Commun. 2015 Jun 15;6:7284. doi: 10.1038/ncomms8284. PMID:26073309[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

  1. Pontiggia F, Pachov DV, Clarkson MW, Villali J, Hagan MF, Pande VS, Kern D. Free energy landscape of activation in a signalling protein at atomic resolution. Nat Commun. 2015 Jun 15;6:7284. doi: 10.1038/ncomms8284. PMID:26073309 doi:http://dx.doi.org/10.1038/ncomms8284
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