7TE2 image
Entry Detail
PDB ID:
7TE2
Keywords:
Title:
Crystal Structure of AerR from Rhodobacter capsulatus at 2.25 A.
Biological Source:
PDB Version:
Deposition Date:
2022-01-04
Release Date:
2022-08-31
Method Details:
Experimental Method:
Resolution:
2.25 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.23
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:AerR
Chain IDs:A
Chain Length:213
Number of Molecules:1
Biological Source:Rhodobacter capsulatus Y262
Primary Citation
Structural Analyses of CrtJ and Its B 12 -Binding Co-Regulators SAerR and LAerR from the Purple Photosynthetic Bacterium Rhodobacter capsulatus.
Microorganisms 10 ? ? (2022)
PMID: 35630357 DOI: 10.3390/microorganisms10050912

Abstact

Among purple photosynthetic bacteria, the transcription factor CrtJ is a major regulator of photosystem gene expression. Depending on growing conditions, CrtJ can function as an aerobic repressor or an anaerobic activator of photosystem genes. Recently, CrtJ's activity was shown to be modulated by two size variants of a B12 binding co-regulator called SAerR and LAerR in Rhodobacter capsulatus. The short form, SAerR, promotes CrtJ repression, while the longer variant, LAerR, converts CrtJ into an activator. In this study, we solved the crystal structure of R. capsulatus SAerR at a 2.25 Å resolution. Hydroxycobalamin bound to SAerR is sandwiched between a 4-helix bundle cap, and a Rossman fold. This structure is similar to a AerR-like domain present in CarH from Thermus termophilus, which is a combined photoreceptor/transcription regulator. We also utilized AlphaFold software to predict structures for the LAerR, CrtJ, SAerR-CrtJ and LAerR-CrtJ co-complexes. These structures provide insights into the role of B12 and an LAerR N-terminal extension in regulating the activity of CrtJ.

Legend

Protein

Chemical

Disease

Primary Citation of related structures