Crystal structure and solution NMR dynamics of a D (type II) peroxiredoxin glutaredoxin and thioredoxin dependent: a new insight into the peroxiredoxin oligomerism.
Peroxiredoxins (Prxs) constitute a family of thiol peroxidases that reduce hydrogen peroxide, peroxinitrite, and hydroperoxides using a strictly conserved cysteine. Very abundant in all organisms, Prxs are produced as diverse isoforms characterized by different catalytic mechanisms and various thiol-containing reducing agents. The oligomeric state of Prxs and the link with their functionality is a subject of intensive research. We present here a combined X-ray and nuclear magnetic resonance (NMR) study of a plant Prx that belongs to the D-Prx (type II) subfamily. The Populus trichocarpa Prx is the first Prx shown to be regenerated in vitro by both the glutaredoxin and thioredoxin systems. The crystal structure and solution NMR provide evidence that the reduced protein is a specific noncovalent homodimer both in the crystal and in solution. The dimer interface is roughly perpendicular to the plane of the central beta sheet and differs from the interface of A- and B-Prx dimers, where proteins associate in the plane parallel to the beta sheet. The homodimer interface involves residues strongly conserved in the D (type II) Prxs, suggesting that all Prxs of this family can homodimerize. The study provides a new insight into the Prx oligomerism and the basis for protein-protein and enzyme-substrate interaction studies by NMR.
Echalier
Aude
A
LCM3B, Groupe Biocristallographie, Université Henri Poincaré-Nancy1, UMR CNRS 7036, 54506 Vandoeuvre, France.
Trivelli
Xavier
X
Corbier
Catherine
C
Rouhier
Nicolas
N
Walker
Olivier
O
Tsan
Pascale
P
Jacquot
Jean-Pierre
JP
Aubry
André
A
Krimm
Isabelle
I
Lancelin
Jean-Marc
JM
D000595:Amino Acid Sequence; D001665:Binding Sites; D016384:Consensus Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D019281:Dimerization; D054477:Glutaredoxins; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D010088:Oxidoreductases / Q000737:chemistry* / Q000378:metabolism; D010544:Peroxidases / Q000737:chemistry* / Q000378:metabolism; D054464:Peroxiredoxins; D010940:Plant Proteins / Q000737:chemistry* / Q000378:metabolism; D032107:Populus / Q000201:enzymology*; D012996:Solutions; D013499:Surface Properties; D013816:Thermodynamics; D013879:Thioredoxins / Q000737:chemistry* / Q000378:metabolism
D054477:Glutaredoxins; D010940:Plant Proteins; D012996:Solutions; D013879:Thioredoxins; D010088:Oxidoreductases; D010544:Peroxidases; D054464:Peroxiredoxins