Calcium in PDB 3blk: Role of Aromatic Residues in Starch Binding

All present enzymatic activity of Role of Aromatic Residues in Starch Binding:
3.2.1.1;

The structure of Role of Aromatic Residues in Starch Binding, PDB code: 3blk was solved by N.Ramasubbu, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	36.16 / 2.00
Space group	P 21 21 21
Cell size a, b, c (Å), α, β, γ (°)	52.282, 75.046, 135.013, 90.00, 90.00, 90.00
R / Rfree (%)	17.6 / 21.5

The structure of Role of Aromatic Residues in Starch Binding also contains other interesting chemical elements:

Chlorine

(Cl)

1 atom

The binding sites of Calcium atom in the Role of Aromatic Residues in Starch Binding (pdb code 3blk). 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 Role of Aromatic Residues in Starch Binding, PDB code: 3blk:

Calcium binding site 1 out of 1 in the Role of Aromatic Residues in Starch Binding


Mono view


Stereo pair view

A full contact list of Calcium with other atoms in the Ca binding site number 1 of Role of Aromatic Residues in Starch Binding within 5.0Å range: probe atom residue distance (Å) B Occ A:Ca497 b:27.9 occ:1.00 O A:HOH527 2.2 30.0 1.0 O A:HIS201 2.4 26.4 1.0 OD1 A:ASN100 2.4 24.8 1.0 O A:HOH525 2.5 30.0 1.0 O A:ARG158 2.5 33.8 1.0 O A:HOH548 2.5 32.7 1.0 OD1 A:ASP167 2.5 30.9 1.0 OD2 A:ASP167 2.6 29.9 1.0 CG A:ASP167 2.9 31.3 1.0 CG A:ASN100 3.4 27.1 1.0 C A:HIS201 3.6 28.3 1.0 C A:ARG158 3.6 33.5 1.0 ND2 A:ASN100 3.9 26.5 1.0 CA A:ARG158 4.2 32.4 1.0 CB A:HIS201 4.3 27.2 1.0 O A:ASN100 4.4 27.4 1.0 CB A:ASP167 4.4 29.3 1.0 CA A:HIS201 4.4 27.9 1.0 N A:MET202 4.5 27.6 1.0 O A:HOH653 4.6 44.9 1.0 N A:ASP159 4.6 33.9 1.0 O A:CYS160 4.6 33.9 1.0 CA A:MET202 4.7 29.1 1.0 CG A:MET202 4.7 30.4 1.0 ND2 A:ASN137 4.7 33.2 1.0 CB A:ASN100 4.8 25.2 1.0 O A:VAL157 4.8 31.1 1.0 O A:LEU168 4.8 28.5 1.0 O A:HOH521 4.9 29.2 1.0 CA A:ASP159 4.9 34.4 1.0

C.Ragunath, S.G.A.Manuel, C.Kasinathan, N.Ramasubbu. Structure-Function Relationships in Human Salivary Alpha-Amylase: Role of Aromatic Residues in A Secondary Binding Site Biologia V. 63 1028 2008.
ISSN: ISSN 0006-3088
DOI: 10.2478/S11756-008-0163-3