Calcium in PDB 6zxs: Cold Grown Pea Photosystem I

All present enzymatic activity of Cold Grown Pea Photosystem I:
1.97.1.12;

The structure of Cold Grown Pea Photosystem I, PDB code: 6zxs was solved by I.Caspy, A.Borovikova-Sheinker, R.Subramanyam, N.Nelson, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	49.63 / 3.00
Space group	P 21 21 21
Cell size a, b, c (Å), α, β, γ (°)	190.197, 201.786, 213.614, 90, 90, 90
R / Rfree (%)	23.9 / 27

The structure of Cold Grown Pea Photosystem I also contains other interesting chemical elements:

Magnesium	(Mg)	156 atoms
Iron	(Fe)	12 atoms

The binding sites of Calcium atom in the Cold Grown Pea Photosystem I (pdb code 6zxs). This binding sites where shown within 5.0 Angstroms radius around Calcium atom.
In total 2 binding sites of Calcium where determined in the Cold Grown Pea Photosystem I, PDB code: 6zxs:
Jump to Calcium binding site number: 1; 2;

Calcium binding site 1 out of 2 in the Cold Grown Pea Photosystem I


Mono view


Stereo pair view

A full contact list of Calcium with other atoms in the Ca binding site number 1 of Cold Grown Pea Photosystem I within 5.0Å range: probe atom residue distance (Å) B Occ B:Ca857 b:123.3 occ:1.00 O B:GLU503 2.7 140.3 1.0 O B:ILE501 2.9 99.0 1.0 OD1 B:ASN506 3.1 97.3 1.0 O B:LEU508 3.1 91.5 1.0 C B:ILE501 3.8 104.1 1.0 O B:ASN506 3.8 114.6 1.0 C B:GLU503 3.8 124.2 1.0 NZ B:LYS469 4.0 79.6 1.0 CG B:ASN506 4.0 94.6 1.0 O B:ALA500 4.1 112.7 1.0 C B:LEU508 4.1 91.2 1.0 O B:PHE509 4.1 102.1 1.0 N B:LEU508 4.2 100.7 1.0 N B:GLU503 4.3 119.5 1.0 C B:ASN506 4.4 115.1 1.0 CA B:ILE501 4.5 87.8 1.0 CA B:LEU508 4.5 87.0 1.0 ND2 B:ASN506 4.5 104.2 1.0 N B:ASN502 4.7 121.5 1.0 CB B:LEU508 4.7 88.9 1.0 CA B:GLU503 4.7 120.0 1.0 C B:PHE509 4.7 77.1 1.0 N B:ASN504 4.7 112.0 1.0 C B:ASN502 4.7 125.6 1.0 CA B:ASN504 4.8 109.6 1.0 CA B:ASN502 4.9 114.9 1.0 C B:SER507 4.9 99.3 1.0 N B:SER507 5.0 114.7 1.0

Calcium binding site 2 out of 2 in the Cold Grown Pea Photosystem I


Mono view


Stereo pair view

A full contact list of Calcium with other atoms in the Ca binding site number 2 of Cold Grown Pea Photosystem I within 5.0Å range: probe atom residue distance (Å) B Occ 3:Ca302 b:129.7 occ:1.00 O A:ILE20 2.9 137.9 1.0 O 3:ASP85 2.9 166.1 1.0 O 3:GLY88 3.2 149.6 1.0 C 3:GLY88 3.7 158.4 1.0 N 3:GLY88 3.9 144.1 1.0 CG2 3:ILE93 3.9 119.8 1.0 C A:ILE20 3.9 126.0 1.0 C 3:ASP85 3.9 148.1 1.0 CB 3:ASP85 4.0 146.2 1.0 CA 3:GLY88 4.1 140.4 1.0 CB A:ILE20 4.3 120.0 1.0 CA 3:ASP85 4.4 145.7 1.0 O 3:LEU83 4.4 145.3 1.0 CA A:ILE20 4.5 137.3 1.0 N 3:ASP85 4.6 147.9 1.0 N A:ILE20 4.6 144.7 1.0 N 3:THR89 4.6 154.5 1.0 N 3:GLU87 4.7 139.5 1.0 O 3:GLY82 4.7 131.7 1.0 CG2 A:ILE20 4.8 115.7 1.0 O 3:ILE93 4.9 152.3 1.0 C 3:GLU87 4.9 157.5 1.0 OD2 3:ASP85 5.0 127.7 1.0 N A:LEU21 5.0 115.8 1.0

N.Nelson, I.Caspy, R.Subramanyam. Structure of Cold Grown Pea Photosystem I To Be Published.