6C27

SAM-III riboswitch ON-state

• PDB DOI: https://doi.org/10.2210/pdb6C27/pdb
• NAKB: 6C27

• Classification: RNA
• Organism(s): Enterococcus faecalis
• Mutation(s): No 


• Deposited: 2018-01-07 Released: 2019-01-09 
• Deposition Author(s): Grigg, J.C., Price, I.R., Ke, A.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.60 Å
• R-Value Free: 0.243 
• R-Value Work: 0.210 
• R-Value Observed: 0.212 

Literature

Evidence for two-tiered conformation selection in the SAM-III riboswitch

Price, I.R., Grigg, J.C., Martell, D.J., Ding, F., Peng, C., Ke, A.

To be published.

Biological Assembly 1  

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: native gel electrophoresis

Biological Assembly 2  

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 32 kDa 
• Atom Count: 2,092 
• Modelled Residue Count: 94 
• Deposited Residue Count: 94 
• Unique nucleic acid chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Length	Organism	Image
SAM-III riboswitch	A, B	47	Enterococcus faecalis

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NCO	C [auth A], D [auth A], E [auth A], F [auth A], G [auth B], H [auth B], I [auth B], J [auth B]	COBALT HEXAMMINE(III) Co H18 N6 DYLMFCCYOUSRTK-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.60 Å
• R-Value Free: 0.243 
• R-Value Work: 0.210 
• R-Value Observed: 0.212 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.011	α = 90
b = 96.791	β = 90
c = 168.882	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data scaling
SOLVE	phasing
PDB_EXTRACT	data extraction
DENZO	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2019-01-09 
Deposition Author(s): Grigg, J.C., Price, I.R., Ke, A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM-086766

Revision History  

• Version 1.0: 2019-01-09
  Type: Initial release
  
• Version 1.1: 2019-02-20
  Changes: Author supporting evidence, Data collection
• Version 1.2: 2022-03-23
  Changes: Author supporting evidence, Database references