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    PDB 158d-1ajq
    PDB 1ak9-1ayk
    PDB 1ayo-1bg7
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    PDB 1dav-1dva
    PDB 1dvi-1el1
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    PDB 1fkv-1fzd
    PDB 1fze-1g9i
    PDB 1g9j-1gr3
    PDB 1gsl-1h5h
    PDB 1h5i-1hn4
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    PDB 1ia6-1iyi
    PDB 1iz7-1jc2
    PDB 1jc9-1jui
    PDB 1jv2-1kck
    PDB 1kcl-1kvx
    PDB 1kvy-1led
    PDB 1lem-1lqd
    PDB 1lqe-1may
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    PDB 1mxg-1nfy
    PDB 1ng0-1nwg
    PDB 1nwk-1o3g
    PDB 1o3h-1om7
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    PDB 1qdt-1qq9
    PDB 1qqj-1rin
    PDB 1rio-1s10
    PDB 1s18-1scv
    PDB 1sdd-1su4
    PDB 1sub-1tf4
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    PDB 1ujc-1uyy
    PDB 1uyz-1v73
    PDB 1v7v-1w2k
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    PDB 1wun-1xkv
    PDB 1xmf-1y3x
    PDB 1y3y-1yqr
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    PDB 2a3y-2arb
    PDB 2are-2bd2
    PDB 2bd3-2bu4
    PDB 2bue-2c6g
    PDB 2c6p-2cy6
    PDB 2cyf-2dso
    PDB 2dtw-2eab
    PDB 2eac-2fe1
      2eac
      2ead
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      2ec6
      2ec9
      2eek
      2eex
      2ef6
      2efb
      2egd
      2eha
      2ehb
      2ei6
      2ei7
      2ei8
      2eig
      2ej1
      2ejn
      2eo7
      2eqd
      2ero
      2erp
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      2es2
      2es4
      2esh
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      2eu8
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      2ev5
      2ewe
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      2exh
      2exi
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      2exk
      2ezv
      2f03
      2f1w
      2f2o
      2f2p
      2f3c
      2f3y
      2f3z
      2f59
      2f8p
      2fcw
      2fe1
    PDB 2ff1-2fwn
    PDB 2fws-2gjp
    PDB 2gjr-2hd9
    PDB 2hes-2i6o
    PDB 2i7a-2ivz
    PDB 2iwa-2j7g
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    PDB 2ow0-2pf2
    PDB 2pfj-2pyz
    PDB 2pz0-2qu1
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    PDB 2zni-3a51
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    PDB 3ai7-3bcf
    PDB 3bdc-3bx1
    PDB 3bxi-3ch2
    PDB 3chj-3d34
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    PDB 3dng-3e4q
    PDB 3e5s-3eqf
    PDB 3eqg-3faq
    PDB 3faw-3fou
    PDB 3foz-3gci
    PDB 3gcj-3gwz
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    PDB 3ior-3k5m
    PDB 3k5s-3kqa
    PDB 3kqf-3lei
    PDB 3lek-3lum
    PDB 3lun-3mip
    PDB 3mis-3n7b
    PDB 3n7x-3nvn
    PDB 3nx7-3owf
    PDB 3ox5-3prq
    PDB 3prr-3sg5
    PDB 3sg6-3u39
    PDB 3u43-3vpp
    PDB 3zqx-4awy
    PDB 4awz-4dtu
    PDB 4dtx-4eoa
    PDB 4epz-5apr
    PDB 5bca-8tln
    PDB 966c-9rnt

Calcium in the structure of Group I Intron-Encoded Homing Endonuclease I-Ceui Complexed With Dna (pdb 2ex5)

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The binding sites of Calcium atom in the structure of Group I Intron-Encoded Homing Endonuclease I-Ceui Complexed With Dna (pdb code 2ex5). This binding sites where shown with 5.0 Angstroms radius around Calcium atom.
The 2ex5 structure was solved by P.C.SPIEGEL, B.L.STODDARD, with X-Ray Crystallography technique, brief refinement statistics is given in the table below:

*Resolution (A)*	20.0-2.2
*Space group*	P2₁2₁2₁
*a (A)*	50.234
*b (A)*	69.176
*c (A)*	169.414
*alpha (°)*	90.00
*beta (°)*	90.00
*gamma (°)*	90.00
*R_factor (%)*	21.9
*R_free (%)*	23.1

Calcium Binding Sites:

Calcium binding site 1 out of 3 in 2ex5

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stereopicture of Calcium binding site 1 out of 3 in 2ex5

Click to enlarge

Mono- and Stereo- picture of 5.0 Angstrom coordination sphere 1 of Calcium in the PDB 2ex5. Coordination sphere was calculated for all residues within 5.0 Angstroms distance from the central Calcium atom, shown by VdW sphere
Residues shown as a stick model or VDW spheres: X: Da615, X: Dg616, Y: Dg715, Y: Dg716, A: Gly65, A: Glu66, B: Gly65, B: Glu66, Y: Hoh1002, A: Hoh1001,

conact list:

Atom	Atom	Distance (A)
Ca	C3' X:Da615	4.13
Ca	O3' X:Da615	3.04
Ca	C4' X:Da615	4.51
Ca	O5' X:Da615	5.00
Ca	OP1 X:Dg616	4.40
Ca	P X:Dg616	3.22
Ca	OP2 X:Dg616	2.24
Ca	O5' X:Dg616	4.10
Ca	C3' Y:Dg715	4.06
Ca	O3' Y:Dg715	3.15
Ca	C4' Y:Dg715	4.55
Ca	OP1 Y:Dg716	4.49
Ca	P Y:Dg716	3.23
Ca	OP2 Y:Dg716	2.22
Ca	O5' Y:Dg716	3.94
Ca	O A:*Gly*65	3.20
Ca	C A:*Gly*65	3.97
Ca	CA A:*Gly*65	4.68
Ca	N A:*Glu*66	4.64
Ca	OE1 A:*Glu*66	2.38
Ca	CB A:*Glu*66	4.77
Ca	OE2 A:*Glu*66	3.90
Ca	CD A:*Glu*66	3.27
Ca	CG A:*Glu*66	4.17
Ca	CA A:*Glu*66	4.48
Ca	O B:*Gly*65	3.81
Ca	C B:*Gly*65	4.33
Ca	CA B:*Gly*65	4.89
Ca	N B:*Glu*66	4.95
Ca	OE1 B:*Glu*66	2.44
Ca	CB B:*Glu*66	4.90
Ca	OE2 B:*Glu*66	2.43
Ca	CD B:*Glu*66	2.73
Ca	CG B:*Glu*66	4.23
Ca	CA B:*Glu*66	4.79
Ca	O Y:*Hoh*1002	3.94
Ca	O A:*Hoh*1001	3.81

interactive model:

Calcium binding site 2 out of 3 in 2ex5

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stereopicture of Calcium binding site 2 out of 3 in 2ex5

Click to enlarge

Mono- and Stereo- picture of 5.0 Angstrom coordination sphere 2 of Calcium in the PDB 2ex5. Coordination sphere was calculated for all residues within 5.0 Angstroms distance from the central Calcium atom, shown by VdW sphere
Residues shown as a stick model or VDW spheres: X: Da605, X: Da606, A: Asp86, A: Pro87, A: Asp128, X: Hoh1097, A: Hoh1003, A: Hoh1077, A: Hoh1078, A: Hoh1095, A: Hoh1137,

conact list:

Atom	Atom	Distance (A)
Ca	C8 X:Da605	4.31
Ca	N7 X:Da605	4.23
Ca	OP2 X:Da605	4.48
Ca	N6 X:Da606	4.49
Ca	N7 X:Da606	4.38
Ca	CB A:*Asp*86	4.58
Ca	OD2 A:*Asp*86	2.69
Ca	OD1 A:*Asp*86	2.61
Ca	CG A:*Asp*86	3.02
Ca	O A:*Pro*87	4.56
Ca	O A:*Asp*128	4.31
Ca	CB A:*Asp*128	4.39
Ca	OD1 A:*Asp*128	4.70
Ca	CG A:*Asp*128	4.78
Ca	O X:*Hoh*1097	2.41
Ca	O A:*Hoh*1003	2.55
Ca	O A:*Hoh*1077	2.27
Ca	O A:*Hoh*1078	2.57
Ca	O A:*Hoh*1095	4.18
Ca	O A:*Hoh*1137	2.71

interactive model:

Calcium binding site 3 out of 3 in 2ex5

Click to enlarge

stereopicture of Calcium binding site 3 out of 3 in 2ex5

Click to enlarge

Mono- and Stereo- picture of 5.0 Angstrom coordination sphere 3 of Calcium in the PDB 2ex5. Coordination sphere was calculated for all residues within 5.0 Angstroms distance from the central Calcium atom, shown by VdW sphere
Residues shown as a stick model or VDW spheres: X: Dg620, Y: Dc705, Y: Dg706, Y: Dc707, B: Lys74, B: Asp86, B: Glu88, B: Asp128, X: Hoh1093, X: Hoh1175, Y: Hoh1096, Y: Hoh1103, Y: Hoh1142, B: Hoh1081, B: Hoh1173, B: Hoh1177,

conact list:

Atom	Atom	Distance (A)
Ca	O6 X:Dg620	4.21
Ca	C5 Y:Dc705	4.83
Ca	N7 Y:Dg706	4.72
Ca	O6 Y:Dg706	4.54
Ca	N4 Y:Dc707	4.48
Ca	CE B:*Lys*74	4.99
Ca	NZ B:*Lys*74	4.25
Ca	CB B:*Asp*86	4.70
Ca	OD2 B:*Asp*86	2.73
Ca	OD1 B:*Asp*86	2.92
Ca	CG B:*Asp*86	3.21
Ca	OE1 B:*Glu*88	4.70
Ca	CB B:*Asp*128	4.58
Ca	OD2 B:*Asp*128	4.25
Ca	CG B:*Asp*128	4.81
Ca	O X:*Hoh*1093	4.72
Ca	O X:*Hoh*1175	2.99
Ca	O Y:*Hoh*1096	2.38
Ca	O Y:*Hoh*1103	2.68
Ca	O Y:*Hoh*1142	4.57
Ca	O B:*Hoh*1081	4.47
Ca	O B:*Hoh*1173	2.61
Ca	O B:*Hoh*1177	4.59