5M86 image
Entry Detail
PDB ID:
5M86
Title:
Crystal Structure of the Thermoplasma acidophilum Protein Ta1207
Biological Source:
PDB Version:
Deposition Date:
2016-10-28
Release Date:
2017-06-14
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.20
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ta1207
Chain IDs:A, B, C, D, E, F, G, H, I, J
Chain Length:333
Number of Molecules:10
Biological Source:Thermoplasma acidophilum DSM 1728
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Primary Citation
Crystal structure of the Thermoplasma acidophilum protein Ta1207.
Acta Crystallogr F Struct Biol Commun 73 328 335 (2017)
PMID: 28580920 DOI: 10.1107/S2053230X17007087

Abstact

The crystal structure of the Ta1207 protein from Thermoplasma acidophilum is reported. Ta1207 was identified in a screen for high-molecular-weight protein complexes in T. acidophilum. In solution, Ta1207 forms homopentamers of 188 kDa. The crystal structure of recombinant Ta1207 solved by Se-MAD at 2.4 Å resolution revealed a complex with fivefold symmetry. In the crystal lattice, calcium ions induce the formation of a nanocage from two pentamers. The Ta1207 protomers comprise two domains with the same novel α/β topology. A deep pocket with a binding site for a negatively charged group suggests that Ta1207 functions as an intracellular receptor for an unknown ligand. Homologues of Ta1207 occur only in Thermoplasmatales and its function might be related to the extreme lifestyle of these archaea. The thermostable Ta1207 complex might provide a useful fivefold-symmetric scaffold for future nanotechnological applications.

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