Contacts of the helix formed by residues 18 - 27 (chain A) in PDB entry 2C56
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 ASP 18 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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17A LEU* 1.3 72.7 - - - +
19A TRP* 1.3 65.1 + - - +
20A THR* 3.4 12.7 + - - -
21A THR* 2.5 45.8 + - - +
22A PHE* 3.0 21.7 + - - +
40A LEU* 4.1 2.0 - - - -
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Residues in contact with TRP 19 (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 LEU 3.9 2.6 + - - -
18A ASP* 1.3 74.1 + - - +
20A THR* 1.3 64.9 + - - +
22A PHE* 3.2 19.1 + + - +
23A ARG* 2.8 48.4 + - + +
28A ILE* 3.8 23.1 - - + -
30A ASP* 2.9 26.8 + - - -
32A TRP 4.3 0.2 - - - -
33A ARG* 3.4 67.5 - - + +
36A MET* 3.6 26.9 - - + -
37A GLU* 3.5 43.6 + - + +
40A LEU* 3.8 14.0 - - + +
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Residues in contact with THR 20 (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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18A ASP* 3.4 12.6 + - - -
19A TRP* 1.3 85.6 - - - +
21A THR* 1.3 59.3 + - - +
23A ARG* 3.7 6.9 - - - +
24A ARG* 3.0 44.5 + - + +
33A ARG* 5.2 5.9 + - - -
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Residues in contact with THR 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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18A ASP* 2.5 37.9 + - - +
20A THR* 1.3 71.2 - - - +
22A PHE* 1.3 66.5 + - - +
24A ARG* 3.3 8.3 + - - +
25A VAL* 2.9 38.5 + - + +
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Residues in contact with PHE 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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18A ASP 3.0 19.0 + - - +
19A TRP* 3.6 31.9 - + - +
21A THR* 1.3 76.4 - - - +
23A ARG* 1.3 63.2 + - - +
25A VAL* 3.2 6.7 + - - -
26A PHE* 3.2 53.9 + + - +
28A ILE* 3.4 25.1 - - + -
36A MET* 4.2 7.0 - - + -
40A LEU* 4.0 25.1 - - + -
49A LEU* 3.7 30.3 - - + -
69A PHE* 4.0 15.0 - + - -
168A PHE* 4.2 11.7 - + - -
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Residues in contact with ARG 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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19A TRP* 2.8 39.6 + - + +
20A THR* 3.7 7.9 + - - +
22A PHE* 1.3 77.6 - - - +
24A ARG* 1.3 83.9 + - - +
27A LEU* 2.9 35.0 + - - +
28A ILE* 2.8 69.8 + - + +
29A ASP* 4.9 0.8 - - - +
30A ASP* 3.4 33.1 - - - +
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Residues in contact with ARG 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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20A THR* 3.0 36.4 + - + +
21A THR* 3.7 7.0 - - - +
23A ARG* 1.3 99.8 - - - +
25A VAL* 1.3 66.3 + - + +
26A PHE 3.4 0.5 + - - -
27A LEU* 3.4 20.4 - - - +
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Residues in contact with VAL 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 THR* 2.9 35.3 + - + +
22A PHE* 3.2 9.1 + - - +
24A ARG* 1.3 78.4 - - + +
26A PHE* 1.3 72.8 + - + +
27A LEU* 3.8 4.2 + - - +
65A ARG* 3.8 47.2 + - - +
66A GLU* 5.6 0.7 - - - -
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Residues in contact with PHE 26 (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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22A PHE* 3.2 49.7 + + - -
25A VAL* 1.3 88.9 - - + +
27A LEU* 1.3 72.9 + - - +
28A ILE* 3.2 11.6 + - + +
49A LEU* 3.9 17.7 - - + -
52A TYR* 3.5 35.9 - + - -
53A ASN* 5.6 3.4 - - - -
65A ARG* 3.7 32.5 - - + +
66A GLU* 4.2 5.7 - - - +
68A VAL* 4.6 4.3 - - + -
69A PHE* 3.4 38.1 - + + +
73A ARG* 3.6 9.2 + - - -
165A TRP* 5.2 1.1 - + - -
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Residues in contact with LEU 27 (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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23A ARG* 2.9 19.2 + - - +
24A ARG* 3.4 17.0 - - - +
25A VAL 4.7 3.1 - - - +
26A PHE* 1.3 80.0 - - - +
28A ILE* 1.3 60.3 + - - +
66A GLU* 3.8 29.2 - - + +
73A ARG* 2.8 38.8 + - - +
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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