Contacts of the helix formed by residues 42 - 49 (chain A) in PDB entry 2IAG
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 TYR 42 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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33A ASP* 2.6 46.7 + - - -
35A GLY* 3.3 25.4 - - - -
36A SER* 5.1 3.8 - - - -
41A GLY* 1.3 74.6 - - - -
43A ALA* 1.3 62.6 + - - +
44A LEU 3.2 3.1 + - - -
45A ASP* 3.3 19.1 + - - +
46A PHE* 3.0 24.1 + - - +
53A PHE* 3.4 36.6 - + + -
57A MET* 3.8 21.1 - - + +
60A LYS* 4.6 4.0 + - - -
67A ILE* 4.3 7.6 - - + -
68A LEU 2.8 20.4 + - - +
69A VAL* 3.9 7.2 - - + -
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Residues in contact with ALA 43 (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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40A LEU* 3.3 36.4 + - + +
41A GLY 3.3 1.6 + - - -
42A TYR* 1.3 76.5 - - - +
44A LEU* 1.3 63.8 + - - +
46A PHE* 4.2 1.2 - - - +
47A GLY* 3.1 19.8 + - - -
69A VAL* 3.7 15.7 - - + +
70A GLY* 3.5 16.4 - - - +
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Residues in contact with LEU 44 (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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37A ILE* 6.3 4.0 - - + -
40A LEU* 6.6 0.2 - - + -
41A GLY 4.9 0.8 + - - -
42A TYR* 3.2 0.8 - - - +
43A ALA* 1.3 76.6 - - - +
45A ASP* 1.3 72.6 + - - +
47A GLY* 3.5 1.3 + - - -
48A LYS* 3.1 38.5 + - + +
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Residues in contact with ASP 45 (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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41A GLY 5.0 0.9 - - - +
42A TYR* 3.3 30.3 + - - +
44A LEU* 1.3 82.2 - - - +
46A PHE* 1.3 63.8 + - - +
48A LYS* 3.5 11.3 + - - +
49A ASP* 3.2 26.5 + - - +
53A PHE* 3.7 27.2 - - + +
56A ARG* 4.5 11.9 + - - +
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Residues in contact with PHE 46 (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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42A TYR 3.0 19.4 + - - +
43A ALA 4.2 2.2 - - - +
45A ASP* 1.3 76.0 - - - +
47A GLY* 1.3 66.1 + - - +
50A ALA* 3.1 35.7 + - + +
53A PHE* 4.0 30.6 - + + -
54A LEU* 4.1 17.3 - - + -
67A ILE* 4.8 7.9 - - + -
69A VAL* 4.4 21.5 - - + -
74A VAL* 5.8 3.1 - - + -
219A ARG* 6.0 2.2 - - - -
356A PHE* 3.5 37.0 - + - -
384A LEU* 3.7 26.5 - - + -
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Residues in contact with GLY 47 (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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43A ALA 3.1 16.5 + - - -
44A LEU 3.9 0.4 - - - -
46A PHE* 1.3 82.9 - - - +
48A LYS* 1.3 60.6 + - - +
219A ARG* 3.5 40.9 + - - -
478A LEU 4.5 1.0 - - - +
479A SER* 3.9 8.3 - - - +
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Residues in contact with LYS 48 (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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44A LEU* 3.1 28.4 + - + +
45A ASP* 3.8 9.9 - - - +
46A PHE 3.4 0.2 - - - -
47A GLY* 1.3 76.1 - - - +
49A ASP* 1.3 79.3 + - - +
56A ARG* 6.2 2.0 - - - +
478A LEU* 3.6 27.8 - - - +
479A SER* 4.1 3.1 + - - +
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Residues in contact with ASP 49 (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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45A ASP 3.2 7.1 + - - +
48A LYS* 1.3 101.8 + - - +
50A ALA* 1.3 62.2 + - - +
51A ALA* 3.9 0.5 - - - +
52A SER* 2.6 39.4 + - - -
53A PHE* 3.1 19.4 + - - +
478A LEU* 3.5 31.8 - - + +
481A TYR* 3.2 16.9 + - - -
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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