6RSK image
Deposition Date 2019-05-21
Release Date 2019-09-18
Last Version Date 2024-01-24
Entry Detail
PDB ID:
6RSK
Keywords:
Title:
Cytochrome c co-crystallized with 20 eq. sulfonato-calix[8]arene and 15 eq. spermine - structure II
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.31 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cytochrome c iso-1
Gene (Uniprot):CYC1
Chain IDs:A, B
Chain Length:108
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae S288c
Primary Citation
Tuning Protein Frameworks via Auxiliary Supramolecular Interactions.
Acs Nano 13 10343 10350 (2019)
PMID: 31490058 DOI: 10.1021/acsnano.9b04115

Abstact

Protein crystals with their precise, periodic array of functional building blocks have potential applications in biomaterials, sensing, and catalysis. This paper describes how a highly porous crystalline framework of a cationic redox protein and an anionic macrocycle can be modulated by a small cationic effector. Ternary composites of protein (∼13 kDa), calix[8]arene (∼1.5 kDa), and effector (∼0.2 kDa) formed distinct crystalline architectures, dependent on the effector concentration and the crystallization technique. A combination of X-ray crystallography and density functional theory (DFT) calculations was used to decipher the framework variations, which appear to be dependent on a calixarene conformation change mediated by the effector. This "switch" calixarene was observed in three states, each of which is associated with a different interaction network. Two structures obtained by co-crystallization with the effector contained an additional protein "pillar", resulting in framework duplication and decreased porosity. These results suggest how protein assembly can be engineered by supramolecular host-guest interactions.

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Primary Citation of related structures