4XCG: Crystal structure of a hexadecameric TF55 complex from S. solfataricus, crystal form I

Chaperonins are essential biological complexes assisting protein folding in all kingdoms of life. Whereas homooligomeric bacterial GroEL binds hydrophobic substrates non-specifically, the heterooligomeric eukaryotic CCT binds specifically to distinct classes of substrates. Sulfolobales, which survive in a wide range of temperatures, have evolved three different chaperonin subunits (alpha, beta, gamma) that form three distinct complexes tailored for different substrate classes at cold, normal, and elevated temperatures. The larger octadecameric beta complexes cater for substrates under heat stress, whereas smaller hexadecameric alphabeta complexes prevail under normal conditions. The cold-shock complex contains all three subunits, consistent with greater substrate specificity. Structural analysis using crystallography and electron microscopy reveals the geometry of these complexes and shows a novel arrangement of the alpha and beta subunits in the hexadecamer enabling incorporation of the gamma subunit.
PDB ID: 4XCGDownload
MMDB ID: 136338
PDB Deposition Date: 2014/12/18
Updated in MMDB: 2017/11
Experimental Method:
x-ray diffraction
Resolution: 3.737  Å
Source Organism:
Similar Structures:
Biological Unit for 4XCG: hexadecameric; determined by author
Molecular Components in 4XCG
Label Count Molecule
Proteins (16 molecules)
Thermosome Subunit Beta(Gene symbol: SSO_RS01395)
Molecule annotation
Thermosome Subunit Alpha(Gene symbol: SSO_RS04340)
Molecule annotation
Chemicals (8 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB