Contacts of the helix formed by residues 8 - 14 (chain I) in PDB entry 2I2R
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 TRP 8 (chain I).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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4I GLY 3.6 18.6 + - - -
5I VAL* 2.9 17.2 + - + +
7I ALA* 1.3 78.1 - - + +
9I LEU* 1.3 66.4 + - - +
10I PRO* 3.3 4.0 - - - -
11I PHE* 3.1 17.3 + + - +
59M GLY 4.5 3.8 + - - -
60M PHE* 4.0 23.8 - + - +
63M GLU* 3.2 34.5 - - + +
64M CYS* 5.8 0.4 - - - -
69M VAL* 4.2 9.6 - - + -
74M PHE* 3.9 35.7 - + - -
77M ILE* 3.7 39.0 - - + +
78M TYR* 3.0 36.0 + + + +
111M PHE* 3.7 35.7 - + - -
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Residues in contact with LEU 9 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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5I VAL 3.6 3.7 + - - +
6I ALA* 3.3 17.9 + - - +
8I TRP* 1.3 77.6 - - - +
10I PRO* 1.3 60.1 - - + +
12I ALA* 2.7 27.9 + - - +
13I ARG* 2.9 12.3 + - - +
28I PRO 5.3 0.5 - - - +
29I LEU* 4.7 19.3 - - + -
78M TYR* 5.3 1.8 - - - -
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Residues in contact with PRO 10 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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6I ALA 3.5 12.8 - - - +
7I ALA* 3.8 7.0 - - - +
8I TRP 3.3 2.9 - - - -
9I LEU* 1.3 90.7 - - + +
11I PHE* 1.3 56.6 + - + +
12I ALA 3.2 0.2 - - - -
13I ARG* 3.7 11.2 - - + +
14I ALA* 2.9 28.6 + - - +
115M LEU* 3.4 31.0 - - + -
118M LEU* 3.7 14.1 - - + +
119M LEU* 3.7 24.7 - - + -
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Residues in contact with PHE 11 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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7I ALA 4.5 0.4 - - - -
8I TRP* 3.1 23.5 + + - -
9I LEU 3.1 1.0 - - - -
10I PRO* 1.3 73.1 - - - +
12I ALA* 1.3 59.8 + - - +
14I ALA* 3.8 9.5 - - - +
15I ALA* 4.0 2.1 + - - +
74M PHE* 5.4 0.7 - + - -
78M TYR* 3.3 16.8 - - - +
90M TYR* 2.4 21.8 + - - -
94M LEU* 3.5 17.9 - - + +
98M PHE* 3.5 17.3 - + - -
111M PHE* 3.5 44.0 - + - -
114M ALA* 3.2 36.3 - - + -
115M LEU* 3.8 17.3 - - + -
118M LEU* 3.6 22.9 - - + -
129M TRP* 3.9 12.6 - + - -
133M LEU* 4.5 1.4 - - - +
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Residues in contact with ALA 12 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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8I TRP 3.9 1.2 + - - -
9I LEU* 2.7 13.1 + - - +
11I PHE* 1.3 75.5 - - - +
13I ARG* 1.3 66.8 + - - +
14I ALA 3.0 1.1 - - - -
15I ALA* 2.9 20.6 + - - +
16I ALA* 3.8 2.9 + - - +
28I PRO 4.2 15.5 - - - +
29I LEU* 5.9 1.1 - - + -
78M TYR* 4.0 22.7 + - + -
81M PHE* 6.4 0.4 - - + -
90M TYR* 3.4 12.8 - - + +
154M ILE* 5.4 1.6 - - - +
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Residues in contact with ARG 13 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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9I LEU 2.9 14.9 + - - +
10I PRO* 4.0 12.3 - - + +
12I ALA* 1.3 74.0 - - - +
14I ALA* 1.3 61.2 + - - +
16I ALA* 3.2 18.5 + - - +
17I ILE* 3.8 12.7 - - + +
28I PRO* 4.2 27.0 + - + +
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Residues in contact with ALA 14 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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10I PRO 2.9 17.9 + - - +
11I PHE 3.8 5.4 - - - +
12I ALA 2.9 0.6 + - - -
13I ARG* 1.3 76.4 - - - +
15I ALA* 1.3 60.1 + - - +
16I ALA 3.2 1.1 + - - -
17I ILE* 3.7 16.7 + - - +
118M LEU* 3.9 13.5 - - + -
129M TRP* 3.7 32.8 - - + -
130M THR* 2.8 30.0 + - - +
133M LEU* 4.8 1.6 - - - -
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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