4N8X: The Structure Of Nostoc Sp. Pcc 7120 Ccml

CcmL is a small, pentameric protein that is argued to fill the vertices of beta-carboxysomal shell. Here we report the structures of two CcmL orthologs, those from Nostoc sp. PCC 7120 and Thermosynechococcus elongatus BP-1. These structures broadly resemble those previously reported for other strains. However, the Nostoc CcmL structure shows an interesting pattern of behavior where two loops that map to the base of the pentamer adopt either an out or in conformation, with a consistent (over six pentamers) out-in-out-in-in pattern of protomers. The pentamers in this structure are also consistently organized into a back-to-back decamer, though evidence suggests that this is likely not present in solution. Forster resonance energy transfer experiments were able to show a weak interaction between CcmL and CcmK2 when CcmK2 was present at >100 muM. Since CcmK2 forms defined bodies with approximately 200 nm diameter at this concentration, this would support the idea that CcmL can only interact with CcmK2 at rare defect points in the growing shell.
PDB ID: 4N8XDownload
MMDB ID: 118271
PDB Deposition Date: 2013/10/18
Updated in MMDB: 2014/07
Experimental Method:
x-ray diffraction
Resolution: 1.93  Å
Source Organism:
Similar Structures:
Biological Unit for 4N8X: pentameric; determined by author and by software (PISA)
Molecular Components in 4N8X
Label Count Molecule
Proteins (5 molecules)
Carbon Dioxide Concentrating Mechanism Protein
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB