Contacts of the helix formed by residues 20 - 25 (chain A) in PDB entry 2FOQ
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 PHE 20 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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4A HIS* 5.9 3.4 - + - -
5A TRP* 4.4 10.1 - + - -
16A TRP* 2.9 16.1 + - - +
17A HIS* 3.5 3.5 - - - -
19A ASP* 1.3 93.8 - - + +
21A PRO* 1.3 61.8 - - - +
22A ILE* 3.1 4.9 - - + +
23A ALA* 2.8 28.1 + - - +
201A PRO* 3.5 32.8 - - + -
202A PRO* 3.7 38.1 - - + +
203A LEU* 4.1 15.7 - - + -
303A B15 3.6 20.2 - - - -
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Residues in contact with PRO 21 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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17A HIS* 3.3 17.2 - - + +
18A LYS 4.9 2.7 - - - +
19A ASP 3.5 8.5 - - - +
20A PHE* 1.3 86.0 - - - +
22A ILE* 1.3 60.8 + - - +
23A ALA* 3.0 2.9 + - - +
24A LYS* 3.2 18.0 + - - +
25A GLY* 5.3 0.2 - - - -
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Residues in contact with ILE 22 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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20A PHE* 3.0 5.6 + - - +
21A PRO* 1.3 75.2 - - - +
23A ALA* 1.3 61.0 + - - +
24A LYS 3.0 0.9 - - - -
25A GLY* 2.8 28.6 + - - +
28A GLN* 3.1 13.2 + - - -
202A PRO 3.7 10.8 - - - +
203A LEU* 3.3 32.8 - - + +
204A LEU* 4.9 5.4 - - + -
205A GLU* 3.7 37.0 - - + +
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Residues in contact with ALA 23 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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13A PRO 5.8 1.3 - - - +
16A TRP* 4.7 1.8 - - + -
17A HIS* 3.7 25.1 - - + +
20A PHE 2.8 17.0 + - - +
21A PRO 3.0 0.2 - - - -
22A ILE* 1.3 79.3 - - - +
24A LYS* 1.3 57.0 + - - +
25A GLY 3.3 0.4 - - - -
28A GLN* 3.5 20.9 - - - +
203A LEU* 3.5 18.6 - - + -
246A ARG* 3.2 21.1 + - - +
249A GLN* 4.2 6.2 - - - +
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Residues in contact with LYS 24 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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17A HIS* 3.7 45.9 + - + +
21A PRO 3.2 10.5 + - - +
22A ILE 3.0 1.8 - - - -
23A ALA* 1.3 76.7 - - - +
25A GLY* 1.4 59.3 + - - +
26A GLU* 4.8 1.4 - - - +
252A LYS* 3.1 18.8 + - - +
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Residues in contact with GLY 25 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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21A PRO 5.3 0.2 - - - -
22A ILE* 2.8 28.9 + - - -
23A ALA 3.3 1.8 + - - -
24A LYS* 1.4 77.1 - - - +
26A GLU* 1.3 66.1 + - - -
27A ARG 3.4 3.4 + - - -
28A GLN* 3.8 9.4 + - - +
205A GLU* 3.7 7.0 - - - -
250A PRO 5.6 0.3 - - - +
252A LYS* 2.8 20.9 + - - +
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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