Contacts of the helix formed by residues 68 - 75 (chain E) in PDB entry 3IKM
Residue contacts within the protein are
derived with the CSU software (Sobolev V., Sorokine A.,
Prilusky J., Abola E.E. and Edelman M. (1999) Automated
analysis of interatomic contacts in proteins.
Bioinformatics, 15, 327-332). A
short description of the analytical approach
is given at the end of the page.
Note:
Non-standard 3 letter residue
codes indicate a heterogroup. To identify
and analyse, use LPC software
Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC - hydrophobic-hydrophilic contact (destabilizing contact)
+/- - indicates presence/absence of a specific contacts
* - indicates residues forming contacts by their side chain
(including CA atoms)
Residues in contact with ALA 68 (chain E).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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67E GLU* 1.3 71.6 - - - +
69E LEU* 1.3 71.7 + - - +
70E LEU 3.2 1.1 + - - -
71E GLU* 3.7 4.3 + - - +
72E ILE* 2.8 25.9 + - + +
354E PHE* 4.8 18.1 - - + -
370E LYS* 3.7 24.2 - - - +
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Residues in contact with LEU 69 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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67E GLU* 3.4 10.5 - - + -
68E ALA* 1.3 79.2 - - - +
70E LEU* 1.3 71.3 + - + +
72E ILE* 2.6 25.5 + - + +
73E CYS* 2.8 19.6 + - - -
350E LEU* 3.4 41.5 - - + +
351E TYR* 3.8 20.0 - - + +
353E SER* 5.0 1.1 - - - -
354E PHE* 4.0 40.6 - - + +
372E LEU* 5.4 2.0 - - + -
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Residues in contact with LEU 70 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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67E GLU* 2.8 60.1 - - + +
68E ALA 3.2 0.8 + - - -
69E LEU* 1.3 76.7 - - - +
71E GLU* 1.3 57.4 + - - +
73E CYS* 2.4 41.8 + - - +
74E GLN* 3.4 3.5 + - - +
83E LYS* 3.4 38.1 - - - +
88E ARG* 4.3 22.7 - - + -
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Residues in contact with GLU 71 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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68E ALA 3.7 2.3 + - - +
69E LEU 3.1 1.0 + - - -
70E LEU* 1.3 77.3 - - - +
72E ILE* 1.3 66.0 + - + +
73E CYS 2.8 10.6 + - - -
74E GLN* 3.1 24.8 + - + +
75E ARG* 3.3 36.2 + - + +
83E LYS* 4.8 11.8 + - - +
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Residues in contact with ILE 72 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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68E ALA* 2.8 25.8 - - + +
69E LEU* 2.6 21.4 + - + +
71E GLU* 1.3 80.5 - - + +
73E CYS* 1.3 59.0 + - - -
75E ARG* 3.8 26.2 - - - +
370E LYS* 3.1 48.5 - - + +
371E VAL 5.6 3.8 - - - +
372E LEU* 6.0 3.4 - - + -
433E ASP 5.0 1.8 - - - +
434E GLU* 3.0 34.8 - - - +
435E MET* 5.2 0.5 - - - -
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Residues in contact with CYS 73 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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69E LEU* 2.8 37.3 + - - -
70E LEU* 2.4 32.8 + - - +
71E GLU 2.8 0.2 + - - -
72E ILE* 1.3 69.3 - - - +
74E GLN* 1.3 60.8 + - - +
75E ARG 3.1 6.9 - - - +
78E PHE* 2.8 63.2 + - + +
79E LEU* 4.1 12.6 - - + -
350E LEU* 4.9 10.8 - - - -
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Residues in contact with GLN 74 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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70E LEU 3.4 3.1 + - - +
71E GLU* 3.1 18.6 + - - +
73E CYS* 1.3 74.8 - - - +
75E ARG* 1.3 62.2 + - - +
76E ARG 2.7 1.6 + - - -
77E HIS* 2.4 51.3 + - + +
78E PHE 4.2 5.1 + - - -
79E LEU* 4.7 9.3 - - + +
81E GLY 4.4 19.1 - - - +
82E SER* 5.3 4.5 - - - +
195F ASN* 5.4 4.7 + - - +
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Residues in contact with ARG 75 (chain E).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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71E GLU* 3.6 32.0 + - + +
72E ILE* 3.8 16.9 - - - +
73E CYS 3.1 9.9 - - - +
74E GLN* 1.3 82.0 - - + +
76E ARG* 1.3 69.9 + - - +
78E PHE* 4.6 0.7 + - - +
370E LYS* 3.6 23.2 - - - +
431E LYS* 3.5 22.2 - - - +
434E GLU* 2.3 43.5 + - + -
435E MET* 4.4 3.5 - - - +
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A short description of the
analytical approach
The contact analysis used in this page
is based upon the approach
developed in:
Sobolev V., Wade R.C., Vriend G.
and Edelman M. PROTEINS (1996)
25, 120-129.
Contact legitimacy depends on the hydrophobic-hydrophilic
properties of the contacting atoms. In order to
define it, for each inter-atomic contact,
eight atom classes have been introduced:
I Hydrophilic - N and O that can donate and accept hydrogen bonds
(e.g., oxygen of hydroxyl group of Ser. or Thr)
II Acceptor - N or O that can only accept a hydrogen bond
III Donor - N that can only donate a hydrogen bond
IV Hydrophobic - Cl, Br, I and all C atoms that are not in
aromatic rings and do not have a covalent bond to
a N or O atom
V Aromatic - C in aromatic rings irrespective of any other
bonds formed by the atom
VI Neutral - C atoms that have a covalent bond to at least one
atom of class I or two or more atoms from class II
or III; atoms; S, F, P, and metal atoms in all cases
VII Neutral-donor - C atoms that have a covalent bond with only one
atom of class III
VIII Neutral-acceptor - C atoms that have a covalent bond with only
one atom of class II
For each pair of contacts the state of legitimacy
is shown below:
Legend:
+, legitimate
-, illegitimate
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Atomic class I II III IV V VI VII VIII
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I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
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Warning!
Atom classes for heterogroups are automatically
assigned based on the atomic coordinates. However, in
three cases (see below) the automatic assignment
is currently ambiguous. In these
cases, the user is advised to manually analyse
the full list of contacts using
LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are
considered "aromatic" (Class V) if the ring is approximately
planar, and "hydrophobic" (Class IV) or "neutral" (Classes
VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
"hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
"carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).
Please E-mail any
questions and/or suggestions concerning this page to
Vladimir.Sobolev@weizmann.ac.il