1G1J: Crystal Structure Of The Oligomerization Domain From Rotavirus Nsp4

During the maturation of rotaviral particles, non-structural protein 4 (NSP4) plays a critical role in the translocation of the immature capsid into the lumen of the endoplasmic reticulum. Full-length NSP4 and a 22 amino acid peptide (NSP4(114-135)) derived from this protein have been shown to induce diarrhea in young mice in an age-dependent manner, and may therefore be the agent responsible for rotavirally-induced symptoms. We have determined the crystal structure of the oligomerization domain of NSP4 which spans residues 95 to 137 (NSP4(95-137)). NSP4(95-137) self-associates into a parallel, tetrameric coiled-coil, with the hydrophobic core interrupted by three polar layers occupying a and d-heptad positions. Side-chains from two consecutive polar layers, consisting of four Gln123 and two of the four Glu120 residues, coordinate a divalent cation. Two independent structures built from MAD-phased data indicated the presence of a strontium and calcium ion bound at this site, respectively. This metal-binding site appears to play an important role in stabilizing the homo-tetramer, which has implications for the engagement of NSP4 as an enterotoxin.
PDB ID: 1G1JDownload
MMDB ID: 15331
PDB Deposition Date: 2000/10/11
Updated in MMDB: 2012/11
Experimental Method:
x-ray diffraction
Resolution: 1.86  Å
Source Organism:
Similar Structures:
Biological Unit for 1G1J: tetrameric; determined by author and by software (PISA,PQS)
Molecular Components in 1G1J
Label Count Molecule
Proteins (4 molecules)
Non-structural Glycoprotein Nsp4
Molecule annotation
Chemical (1 molecule)
* Click molecule labels to explore molecular sequence information.

Citing MMDB