Chlorine 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
Calcium	(Ca)	2 atoms

The binding sites of Chlorine atom in the Monomeric Cyanobacterial Photosystem I (pdb code 6hqb). This binding sites where shown within 5.0 Angstroms radius around Chlorine atom.
In total only one binding site of Chlorine was determined in the Monomeric Cyanobacterial Photosystem I, PDB code: 6hqb:

Chlorine binding site 1 out of 1 in the Monomeric Cyanobacterial Photosystem I


Mono view


Stereo pair view

A full contact list of Chlorine with other atoms in the Cl binding site number 1 of Monomeric Cyanobacterial Photosystem I within 5.0Å range: probe atom residue distance (Å) B Occ B:Cl6000 b:89.9 occ:1.00 NH2 A:ARG647 3.0 63.6 1.0 OG1 A:THR641 3.1 98.1 1.0 NH1 A:ARG647 3.2 59.1 1.0 N A:GLY644 3.3 82.9 1.0 NH2 A:ARG462 3.5 83.7 1.0 CZ A:ARG647 3.5 63.9 1.0 CA A:GLY644 3.7 81.5 1.0 CB A:ASN643 3.7 81.7 1.0 C A:ASN643 3.7 83.1 1.0 ND2 A:ASN643 3.8 84.6 1.0 O B:TYR632 3.9 0.3 1.0 CD A:ARG462 4.0 90.3 1.0 CG A:ASN643 4.1 80.7 1.0 CD B:PRO634 4.2 0.5 1.0 O A:ASN643 4.3 84.6 1.0 CB A:THR641 4.3 95.7 1.0 CA A:ASN643 4.3 80.5 1.0 CE1 B:TYR632 4.5 87.8 1.0 CZ A:ARG462 4.6 88.7 1.0 CD1 B:TYR632 4.7 88.3 1.0 CG B:PRO634 4.7 0.7 1.0 CA B:ASN633 4.7 0.6 1.0 NE A:ARG462 4.8 91.7 1.0 CG2 A:THR641 4.8 99.3 1.0 NE A:ARG647 4.9 71.3 1.0 N A:ASN643 4.9 80.6 1.0 C B:TYR632 4.9 0.4 1.0 O A:SER638 4.9 85.2 1.0 N B:PRO634 4.9 0.1 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