2N6S: Structure Of Cssa4 (bottom Stem) Of Cssa Thermometer

Neisseria meningitidis causes bacterial meningitis and septicemia. It evades the host complement system by upregulating expression of immune evasion factors in response to changes in temperature. RNA thermometers within mRNAs control expression of bacterial immune evasion factors, including CssA, in the 5'-untranslated region of the operon for capsule biosynthesis. We dissect the molecular mechanisms of thermoregulation and report the structure of the CssA thermometer. We show that the RNA thermometer acts as a rheostat, whose stability is optimized to respond in a small temperature range around 37 degrees C as occur within the upper airways during infection. Small increases in temperature gradually open up the structure to allow progressively increased access to the ribosome binding site. Even small changes in stability induced by mutations of imperfect base pairs, as in naturally occurring polymorphisms, shift the thermometer response outside of the desired temperature range, suggesting that its activity could be modulated by pharmacological intervention.
PDB ID: 2N6SDownload
MMDB ID: 141455
PDB Deposition Date: 2015/8/28
Updated in MMDB: 2016/11
Experimental Method:
solution nmr
Source Organism:
Biological Unit for 2N6S: monomeric; determined by author
Molecular Components in 2N6S
Label Count Molecule
Nucleotide(1 molecule)
RNA (36-mer)
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB