2J5W: Ceruloplasmin Revisited: Structural And Functional Roles Of Various Metal Cation Binding Sites

Citation:
Abstract
The three-dimensional molecular structure of human serum ceruloplasmin has been reinvestigated using X-ray synchrotron data collected at 100 K from a crystal frozen to liquid-nitrogen temperature. The resulting model, with an increase in resolution from 3.1 to 2.8 A, gives an overall improvement of the molecular structure, in particular the side chains. In addition, it enables the clear definition of previously unidentified Ca2+-binding and Na+-binding sites. The Ca2+ cation is located in domain 1 in a configuration very similar to that found in the activated bovine factor Va. The Na+ sites appear to play a structural role in providing rigidity to the three protuberances on the top surface of the molecule. These features probably help to steer substrates towards the mononuclear copper sites prior to their oxidation and to restrict the size of the approaching substrate. The trinuclear copper centre appears to differ from the room-temperature structure in that a dioxygen moiety is bound in a similar way to that found in the endospore coat protein CotA from Bacillus subtilis.
PDB ID: 2J5WDownload
MMDB ID: 43976
PDB Deposition Date: 2006/9/19
Updated in MMDB: 2007/11
Experimental Method:
x-ray diffraction
Resolution: 2.8  Å
Source Organism:
Similar Structures:
Biological Unit for 2J5W: monomeric; determined by author and by software (PQS)
Molecular Components in 2J5W
Label Count Molecule
Protein (1 molecule)
1
Ceruloplasmin(Gene symbol: CP)
Molecule annotation
Chemicals (17 molecules)
1
1
2
3
3
7
4
1
5
1
6
2
7
2
* Click molecule labels to explore molecular sequence information.

Citing MMDB
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