Contacts of the helix formed by residues 138 - 144 (chain D) in PDB entry 2I6A
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 LEU 138 (chain D).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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14D ASN* 3.8 22.0 - - - +
16D LEU* 4.0 16.2 - - + -
40D LEU* 3.8 21.3 - - + -
121D GLY* 3.1 8.0 - - - -
136D ALA* 3.5 12.6 + - + +
137D ASN* 1.3 72.0 - - - +
139D ALA* 1.3 66.8 + - - +
140D ALA 3.0 1.6 + - - -
141D ALA* 2.8 22.6 + - + +
142D ASN* 4.2 15.7 - - + +
173D THR* 3.7 23.8 - - - +
174D VAL* 3.9 17.9 - - + -
500D 5I5 3.8 15.0 - - - +
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Residues in contact with ALA 139 (chain D).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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118D GLN* 3.8 30.7 + - - +
119D PRO* 3.1 23.1 - - + +
120D THR 4.6 0.4 - - - +
121D GLY* 4.0 3.1 - - - -
137D ASN* 3.2 25.1 - - - +
138D LEU* 1.3 74.6 - - - +
140D ALA* 1.3 65.3 + - - +
142D ASN* 3.0 20.9 + - - +
143D CYS* 3.9 1.7 - - - -
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Residues in contact with ALA 140 (chain D).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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89D CYS* 3.1 20.9 - - - +
90D ILE* 3.5 5.2 - - - -
91D GLY 3.4 27.8 - - - +
115D GLN* 3.4 14.4 - - - +
118D GLN* 3.6 3.7 - - - +
119D PRO 3.0 17.5 + - - +
120D THR* 3.7 4.5 - - - -
121D GLY 3.9 0.2 - - - +
138D LEU 3.0 1.0 + - - -
139D ALA* 1.3 74.0 - - - +
141D ALA* 1.3 65.5 + - - +
142D ASN 2.9 3.2 + - - -
143D CYS* 3.1 19.9 + - - -
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Residues in contact with ALA 141 (chain D).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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13D GLY 5.2 0.2 - - - +
14D ASN* 3.5 42.0 - - + +
15D PRO* 4.3 5.8 - - - +
16D LEU* 3.6 13.2 - - + -
89D CYS* 3.3 15.3 + - - +
121D GLY 4.3 2.6 - - - +
138D LEU* 2.8 23.9 + - + +
140D ALA* 1.3 74.1 - - - +
142D ASN* 1.3 60.2 + - - +
143D CYS 3.4 0.5 + - - -
144D TYR* 3.8 10.7 + - - +
171D PHE* 4.5 2.1 - - - -
174D VAL* 3.7 11.3 - - - +
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Residues in contact with ASN 142 (chain D).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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118D GLN* 5.6 2.4 + - - +
138D LEU* 3.9 17.8 + - + +
139D ALA 3.0 14.6 + - - +
140D ALA 2.9 1.2 - - - -
141D ALA* 1.3 78.6 - - - +
143D CYS* 1.3 61.2 + - - +
144D TYR 3.3 1.8 - - - +
145D LYS* 5.1 4.5 - - - -
173D THR* 4.0 5.9 + - - -
174D VAL* 3.3 43.7 + - - +
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Residues in contact with CYS 143 (chain D).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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89D CYS* 3.1 22.6 - - - -
113D TYR* 5.4 3.7 - - + -
115D GLN* 4.0 12.3 - - + -
118D GLN* 3.6 26.9 - - - -
139D ALA 3.9 2.5 - - - -
140D ALA* 3.1 27.7 + - - -
142D ASN* 1.3 76.1 - - - +
144D TYR* 1.3 63.9 + - - +
145D LYS* 3.1 19.8 + - - +
148D LYS* 5.0 4.2 - - - +
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Residues in contact with TYR 144 (chain D).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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12D MET* 3.2 29.4 - - + +
87D PHE* 3.8 4.7 - - + -
88D GLY* 3.8 31.6 - - - -
89D CYS* 3.7 15.0 - - + +
113D TYR* 4.8 5.2 - - + -
141D ALA 4.1 6.7 - - - +
142D ASN 3.3 2.9 - - - +
143D CYS* 1.3 76.2 - - - +
145D LYS* 1.3 68.4 + - - +
146D LYS 4.3 4.7 - - - -
149D HIS* 3.0 46.6 + + + -
150D LEU* 3.1 23.2 - - + +
171D PHE* 3.6 26.5 - + + -
174D VAL* 4.1 5.4 - - + +
175D SER* 3.6 16.0 - - - -
178D SER* 3.5 18.6 - - - -
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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