Contacts of the helix formed by residues 82 - 87 (chain A) in PDB entry 3IKM
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 GLY 82 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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80A SER* 3.8 3.2 + - - -
81A ARG* 1.3 90.0 - - - +
83A LEU* 1.3 66.9 + - - +
85A GLU* 2.9 34.9 - - - +
86A GLN* 3.9 2.3 + - - +
125A LEU* 4.5 7.0 - - - +
127A LEU* 4.4 2.5 - - - -
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Residues in contact with LEU 83 (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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79A LEU* 3.4 22.4 - - + -
80A SER 2.6 49.6 - - - +
81A ARG* 3.2 3.8 - - - +
82A GLY* 1.3 73.7 - - - +
84A HIS* 1.3 51.9 + - - +
85A GLU 2.3 21.1 + - - -
86A GLN 2.5 2.3 + - - +
87A ILE* 2.4 65.0 + - + +
88A PHE 3.1 21.3 - - - +
89A GLY* 3.0 19.5 - - - +
125A LEU* 6.2 0.7 - - + -
1166A TYR* 5.1 0.4 - - - +
1172A ASP* 5.2 0.2 - - - -
1173A LEU 6.0 0.2 - - - +
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Residues in contact with HIS 84 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
70A ARG* 3.2 27.3 - - + +
71A HIS* 4.4 10.5 + + - -
80A SER 2.9 22.0 + - - -
81A ARG* 3.4 24.2 - - + +
83A LEU* 1.3 76.9 - - - +
85A GLU* 1.3 59.1 + - + +
87A ILE 2.8 9.9 + - - +
88A PHE* 4.9 8.3 - - - +
89A GLY 4.7 10.8 + - - -
90A GLN* 5.7 6.7 - - - -
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Residues in contact with GLU 85 (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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81A ARG* 4.0 8.1 - - - +
82A GLY* 2.9 22.2 - - - +
83A LEU 2.3 11.1 + - - -
84A HIS* 1.3 72.0 - - + +
86A GLN* 1.3 64.7 + - + +
127A LEU 2.0 29.3 - - - +
128A PRO* 2.7 34.1 - - - +
129A PRO* 4.6 1.6 - - - +
130A LEU* 3.8 22.2 + - - +
131A TYR 4.3 4.0 - - - +
132A GLY 4.1 6.2 - - - +
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Residues in contact with GLN 86 (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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82A GLY 3.9 2.3 + - - +
83A LEU* 2.5 8.5 + - - -
84A HIS 5.1 0.2 - - - -
85A GLU* 1.3 74.5 - - + +
87A ILE* 1.3 70.3 + - + +
130A LEU* 2.9 32.7 - - - +
131A TYR 3.5 3.6 - - - +
132A GLY* 2.8 52.3 - - - +
134A ASN 5.1 2.5 + - - +
135A LEU* 2.9 38.9 - - + +
138A HIS* 3.9 17.6 - - - +
1159A LEU* 5.5 5.8 - - + +
1166A TYR* 4.9 0.3 - - - -
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Residues in contact with ILE 87 (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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83A LEU* 2.4 58.9 + - + +
84A HIS* 2.8 8.4 + - - +
85A GLU 3.8 0.2 - - - -
86A GLN* 1.3 85.4 - - + +
88A PHE* 1.3 108.3 + - + +
135A LEU* 3.5 26.5 - - + -
1162A CYS* 3.5 21.8 - - + -
1166A TYR* 2.4 58.1 - - + +
1171A ASN 4.2 0.4 - - - +
1172A ASP* 3.5 2.7 - - - +
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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