1J9G: Low Temperature (100k) Crystal Structure Of Flavodoxin D. Vulgaris S64c Mutant, Monomer Oxidised, At 2.4 Angstrom Resolution

Engineered flavodoxins in which a surface residue has been replaced by an exposed cysteine are useful modules to link multi-domain redox proteins obtained by gene fusion to electrode surfaces. In the present work, the crystal structure of the S35C mutant of Desulfovibrio vulgaris flavodoxin in the oxidized state has been determined and compared with a refined structure of the wild type (wt). The structure of wt flavodoxin (space group P4(3)2(1)2, unit-cell parameters a = 50.52, b = 50.52, c = 138.59 A) at 1.34 A resolution has been refined to R = 0.16 and R(free) = 0.18. The structure of the S35C mutant (space group P4(3)2(1)2, unit-cell parameters a = 50.55, b = 50.55, c = 138.39 A) at 1.44 A resolution has been refined to R = 0.13 and R(free) = 0.16. Data sets were collected with synchrotron radiation at 100 K. In the S35C mutant, the Cys35 thiol group points towards a hydrophobic region, whilst in the wt the Ser35 hydroxyl group points towards a more polar region. The solvent exposure of Cys35 is 43 A(2), of which 8 A(2) is for the sulfur. This is comparable to the exposure of 48 A(2) found for the wt Ser35, where that of the hydroxyl oxygen is also 8 A(2).
PDB ID: 1J9GDownload
MMDB ID: 17056
PDB Deposition Date: 2001/5/25
Updated in MMDB: 2012/11
Experimental Method:
x-ray diffraction
Resolution: 2.4  Å
Source Organism:
Similar Structures:
Biological Unit for 1J9G: monomeric; determined by author
Molecular Components in 1J9G
Label Count Molecule
Protein (1 molecule)
Flavodoxin(Gene symbol: DVU2680)
Molecule annotation
Chemical (1 molecule)
* Click molecule labels to explore molecular sequence information.

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