1UTG image
Deposition Date 1989-04-03
Release Date 1989-10-15
Last Version Date 2024-10-16
Entry Detail
PDB ID:
1UTG
Keywords:
Title:
REFINEMENT OF THE C2221 CRYSTAL FORM OF OXIDIZED UTEROGLOBIN AT 1.34 ANGSTROMS RESOLUTION
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.34 Å
R-Value Observed:
0.23
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:UTEROGLOBIN
Gene (Uniprot):SCGB1A1
Chain IDs:A
Chain Length:70
Number of Molecules:1
Biological Source:Oryctolagus cuniculus
Primary Citation

Abstact

The structure of uteroglobin, a progesterone binding protein from rabbit uterine fluid, was determined and refined at 1.34 A resolution to a conventional R-factor of 0.229. The accuracy of the co-ordinates is estimated to be 0.15 A. The isotropic temperature factor of individual atoms was refined and its average value is 11.9 A2 for the 548 non-hydrogen atoms of the protein monomer. A total of 83 water molecules was located in difference electron density maps and refined, first using a constant occupancy factor of 1 and then variable occupancy, the final (Q) being 0.63. The mean temperature factor of the water oxygen atoms is 26.4 A2. Uteroglobin is a dimer and its secondary structure consists of four alpha-helices per monomer that align in an anti-parallel fashion. There is one beta-turn between helix 2 and helix 3 (Lys26 to Glu29); 76% of the residues are part of the alpha-helices. In the core of the dimeric protein molecule, between the two monomers that are held together by two disulfide bridges, we have observed a closed cavity. Its length is 15.6 A and its width is 9 A; 14 water molecules could be positioned inside. In the "bottom" part of the protein, near the C terminus, we have observed a smaller cavity, occupied by two water molecules. The calculation of the molecular surface revealed four surface pockets whose possible functional implications are discussed below.

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