Calcium in PDB 6hqb: Monomeric Cyanobacterial Photosystem I

All present enzymatic activity of Monomeric Cyanobacterial Photosystem I:
1.97.1.12;

The structure of Monomeric Cyanobacterial Photosystem I, PDB code: 6hqb was solved by S.Y.Netzer-El, N.Nelson, I.Caspy, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	49.29 / 4.00
Space group	P 21 21 21
Cell size a, b, c (Å), α, β, γ (°)	124.322, 178.658, 181.446, 90.00, 90.00, 90.00
R / Rfree (%)	25.5 / 29.5

The structure of Monomeric Cyanobacterial Photosystem I also contains other interesting chemical elements:

Magnesium	(Mg)	93 atoms
Iron	(Fe)	12 atoms
Chlorine	(Cl)	1 atom

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

Calcium binding site 1 out of 2 in the Monomeric Cyanobacterial Photosystem I


Mono view


Stereo pair view

A full contact list of Calcium with other atoms in the Ca binding site number 1 of Monomeric Cyanobacterial Photosystem I within 5.0Å range: probe atom residue distance (Å) B Occ B:Ca6001 b:0.1 occ:1.00 OE2 B:GLU134 2.7 0.6 1.0 OE1 B:GLU201 2.9 0.5 1.0 CD2 B:HIS206 3.3 0.0 1.0 O B:GLY128 3.4 0.3 1.0 NE2 B:HIS206 3.6 0.8 1.0 CD B:GLU134 3.7 0.0 1.0 CD B:GLU201 3.8 0.3 1.0 O B:VAL207 3.9 0.6 1.0 CG B:HIS206 4.2 0.2 1.0 OE1 B:GLU134 4.2 0.1 1.0 O1D B:CLA1211 4.4 0.4 1.0 C B:GLY128 4.4 0.7 1.0 N B:VAL207 4.4 0.1 1.0 OG1 B:THR130 4.4 0.3 1.0 OE2 B:GLU201 4.4 0.3 1.0 CG B:GLU201 4.5 0.2 1.0 C B:VAL207 4.5 0.4 1.0 CE1 B:HIS206 4.6 0.8 1.0 CG1 B:VAL197 4.7 94.9 1.0 CG B:GLU134 4.8 0.8 1.0 CA B:HIS206 4.8 0.7 1.0 O2D B:CLA1211 4.9 0.4 1.0 ND1 B:HIS206 4.9 0.6 1.0 CB B:HIS206 4.9 0.8 1.0 CB B:GLU201 4.9 0.6 1.0 N B:THR130 5.0 0.3 1.0 CGD B:CLA1211 5.0 0.1 1.0

Calcium binding site 2 out of 2 in the Monomeric Cyanobacterial Photosystem I


Mono view


Stereo pair view

A full contact list of Calcium with other atoms in the Ca binding site number 2 of Monomeric Cyanobacterial Photosystem I within 5.0Å range: probe atom residue distance (Å) B Occ L:Ca1001 b:0.7 occ:1.00 O L:PRO70 2.5 0.9 1.0 OD1 L:ASP73 2.5 0.3 1.0 OD1 A:ASP469 3.2 0.0 1.0 CG L:ASP73 3.4 0.2 1.0 C L:PRO70 3.6 0.3 1.0 OD2 L:ASP73 3.6 0.7 1.0 CG A:GLN468 4.0 0.2 1.0 CG A:ASP469 4.1 0.3 1.0 OD2 A:ASP469 4.2 0.8 1.0 NH1 L:ARG72 4.4 0.8 1.0 CA L:PRO70 4.4 0.1 1.0 N L:ARG72 4.5 1.0 1.0 N L:LEU71 4.5 0.6 1.0 O L:GLY69 4.5 0.9 1.0 N L:ASP73 4.6 0.6 1.0 CA L:LEU71 4.6 0.2 1.0 NE2 A:GLN468 4.7 0.5 1.0 CB L:ASP73 4.8 0.4 1.0 CD A:GLN468 4.9 0.3 1.0 CG L:ARG72 4.9 0.5 1.0 O A:GLN468 4.9 0.2 1.0 C L:LEU71 5.0 0.6 1.0

S.Y.Netzer-El, I.Caspy, N.Nelson. Crystal Structure of Photosystem I Monomer From Synechocystis Pcc 6803. Front Plant Sci V. 9 1865 2018.
ISSN: ESSN 1664-462X
PubMed: 30662446
DOI: 10.3389/FPLS.2018.01865