Crystal Structure of AerR from Rhodobacter capsulatus at 2.25 A.

2-Gaussian fit: Grosse-Kunstleve RW, Sauter NK, Adams PD: Newsletter of the IUCr Commission on Crystallographic Computing 2004, 3, 22-31.

Structural Analyses of CrtJ and Its B 12 -Binding Co-Regulators SAerR and LAerR from the Purple Photosynthetic Bacterium Rhodobacter capsulatus.

SLQTVLVNRMVELATGPELGAMDLLFDEFRAAHVPVEEMATHYIPEAARQIGAAWDSDRIGFAQVTIAISRLQELLHALQ
TLVTADSVGCANGATVLLIVPPGEQHTLGALIVAMELRRRGVSVRIVFAPGLSDLSRLMATTRFDAALITVGSMDRVEIC
AKLVKTLSSLTKGRMRVAIGGAIVSQRAEALARTGADLVTNDLSLVISEFSLV

HEPES pH 7.8, NaCl 3.2 M, 1,6-Hexanediol 8%

National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

There is split consensus with respect to the geometry in the C19 atom of vitamin B12. Therefore, caution is advised when inspecting this region. Several structures containing B12 in the PDB are modeled using the B12 ligand definition from the CCP4 dictionary, where C19 is planar and has a double bond to N24. However, in high resolution structures (i.e. PDB code 3CI3), C19 atom seems to be tetragonal, which is in agreement with the B12 model in the Cambridge Structural Database (CSD).

transcription, B12 binding, transcription regulator, photosynthesis, gene regulator

LQTVLVNRMVELATGPELGAMDLLFDEFRAAHVPVEEMATHYIPEAARQIGAAWDSDRIGFAQVTIAISRLQELLHALQT
LVTADSVGCANGATVLLIVPPGEQHTLGALIVAMELRRRGVSVRIVFAPGLSDLSRLMATTRFDAALITVGSMDRVEICA
KLVKTLSSLTKGRMRVAIGGAIVSQRAEALARTGADLVTNDLSLVISEFSLV