Calcium in PDB 1pk6: Globular Head of the Complement System Protein C1Q

The structure of Globular Head of the Complement System Protein C1Q, PDB code: 1pk6 was solved by C.Gaboriaud, J.Juanhuix, A.Gruez, M.Lacroix, C.Darnault, D.Pignol, D.Verger, J.C.Fontecilla-Camps, G.J.Arlaud, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	25.40 / 1.85
Space group	C 1 2 1
Cell size a, b, c (Å), α, β, γ (°)	80.182, 53.222, 90.880, 90.00, 112.32, 90.00
R / Rfree (%)	19.9 / 23.9

The binding sites of Calcium atom in the Globular Head of the Complement System Protein C1Q (pdb code 1pk6). This binding sites where shown within 5.0 Angstroms radius around Calcium atom.
In total only one binding site of Calcium was determined in the Globular Head of the Complement System Protein C1Q, PDB code: 1pk6:

Calcium binding site 1 out of 1 in the Globular Head of the Complement System Protein C1Q


Mono view


Stereo pair view

A full contact list of Calcium with other atoms in the Ca binding site number 1 of Globular Head of the Complement System Protein C1Q within 5.0Å range: probe atom residue distance (Å) B Occ B:Ca1 b:27.4 occ:1.00 OE1 B:GLN179 2.4 28.3 1.0 OD2 B:ASP172 2.4 26.4 1.0 OE1 A:GLN177 2.5 27.5 1.0 O B:TYR173 2.5 32.1 1.0 O B:HOH244 2.6 28.9 1.0 O C:HOH272 2.7 27.8 1.0 CG B:ASP172 3.3 27.0 1.0 CD B:GLN179 3.5 25.6 1.0 C B:TYR173 3.5 32.8 1.0 CD A:GLN177 3.6 28.7 1.0 OD1 B:ASP172 3.8 25.0 1.0 O A:PHE176 4.0 29.2 1.0 N B:TYR173 4.1 29.8 1.0 NE2 C:GLN173 4.1 28.8 1.0 CB B:GLN179 4.2 24.4 1.0 NE2 A:GLN177 4.2 27.8 1.0 NE2 B:GLN179 4.3 26.5 1.0 CA B:TYR173 4.4 31.0 1.0 C B:ASP172 4.4 28.2 1.0 CG B:GLN179 4.4 24.4 1.0 CA A:GLN177 4.4 26.4 1.0 N B:ALA174 4.5 35.3 1.0 CB B:ASP172 4.5 27.2 1.0 O B:HOH255 4.6 46.6 1.0 CA B:ALA174 4.6 37.3 1.0 CB B:ALA174 4.6 37.2 1.0 O A:HOH268 4.6 26.6 1.0 O C:HOH233 4.7 27.4 1.0 CG A:GLN177 4.7 27.0 1.0 CB A:GLN177 4.7 26.7 1.0 CA B:ASP172 4.8 27.6 1.0 O B:ASP172 4.9 28.1 1.0

C.Gaboriaud, J.Juanhuix, A.Gruez, M.Lacroix, C.Darnault, D.Pignol, D.Verger, J.C.Fontecilla-Camps, G.J.Arlaud. The Crystal Structure of the Globular Head of Complement Protein C1Q Provides A Basis For Its Versatile Recognition Properties. J.Biol.Chem. V. 278 46974 2003.
ISSN: ISSN 0021-9258
PubMed: 12960167
DOI: 10.1074/JBC.M307764200