Contacts of the helix formed by residues 117 - 121 (chain A) in PDB entry 1IAX
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 117 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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103A ALA* 4.6 1.1 - - - -
116A PHE* 1.3 70.0 - - - +
118A PRO* 1.3 60.1 - - - +
119A GLU* 2.6 58.7 + - - +
120A ARG* 2.7 37.6 + - + +
121A VAL* 3.7 2.3 + - - -
291A TYR* 3.2 18.1 + - - +
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Residues in contact with PRO 118 (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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99A ARG* 3.0 41.2 - - + +
100A LYS* 3.5 46.0 - - + +
103A ALA* 4.0 5.8 - - + -
116A PHE 3.4 11.2 - - - +
117A ASP* 1.3 83.8 - - - +
119A GLU* 1.3 68.3 + - + +
120A ARG 3.2 0.4 - - - -
121A VAL* 3.3 12.2 + - + -
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Residues in contact with GLU 119 (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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93A HIS* 4.9 3.1 - - - -
99A ARG* 3.0 40.7 + - - +
100A LYS* 5.9 2.8 - - - -
117A ASP* 2.6 28.2 + - - +
118A PRO* 1.3 80.0 - - + +
120A ARG* 1.3 56.2 + - + +
121A VAL 3.3 1.5 - - - +
298A VAL* 4.7 0.3 - - - +
302A ARG* 3.1 28.9 + - - -
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Residues in contact with ARG 120 (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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117A ASP* 2.7 25.3 + - + +
119A GLU* 1.3 74.5 - - + +
121A VAL* 1.3 59.5 + - - -
122A VAL* 3.5 10.1 + - - +
290A ILE 3.7 6.1 - - - +
291A TYR* 3.4 41.0 - - + -
292A SER 2.6 36.2 + - - +
293A PHE* 3.6 16.2 + - - +
294A ASN 3.6 5.9 + - - -
295A ASP* 2.7 40.5 + - - +
298A VAL* 3.0 35.3 - - + +
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Residues in contact with VAL 121 (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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92A TYR 5.6 1.0 - - - +
93A HIS* 5.0 2.3 - - - +
98A PHE* 5.3 3.1 - - + -
99A ARG* 3.8 36.6 - - + +
102A ILE* 4.2 15.5 - - + -
103A ALA* 4.5 13.2 - - + +
106A MET* 5.0 4.5 - - - -
116A PHE* 5.8 0.2 - - + -
117A ASP 4.1 3.1 - - - +
118A PRO* 3.3 28.4 + - + +
119A GLU 3.3 0.2 - - - -
120A ARG* 1.3 76.9 - - - +
122A VAL* 1.3 67.1 + - - +
123A MET* 4.5 1.7 + - + +
289A ILE* 4.1 27.8 - - + -
290A ILE 4.2 2.5 - - - -
291A TYR* 4.1 14.1 - - + -
302A ARG* 4.5 5.5 + - - +
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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