Contacts of the helix formed by residues 161 - 164 (chain A) in PDB entry 1XIL
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 TRP 161 (chain A).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
34A PHE* 5.6 0.9 - + - -
66A PHE* 3.6 25.1 - + - -
121A SER* 3.4 23.6 - - - +
122A GLY 3.5 17.5 - - - +
123A TRP* 4.1 2.0 - - - -
142A ASN* 2.9 39.8 + - - -
143A GLN* 3.2 22.4 - - - +
159A ASP* 3.0 18.2 + - - +
160A VAL* 1.3 77.6 - - - +
162A GLU* 1.3 66.4 + - - +
163A HIS* 3.4 34.8 - + + +
164A ALA* 3.0 16.6 + - - +
165A YOF 3.1 10.0 - - - -
120B GLY* 3.5 28.5 - - - -
162B GLU* 3.6 22.2 - - + -
173B ARG* 5.3 4.5 - - - -
----------------------------------------------------------
Back to top of page
Residues in contact with GLU 162 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
120A GLY 6.2 0.2 - - - +
121A SER* 5.1 2.7 + - - +
160A VAL 3.7 1.5 + - - +
161A TRP* 1.3 73.9 - - - +
163A HIS* 1.3 59.3 + - - +
164A ALA 3.0 1.0 + - - -
165A YOF 3.0 26.4 + - + +
166A YOF 2.8 52.4 + - + +
173A ARG* 5.6 2.7 - - - +
30B HIS* 3.8 3.6 - - - -
121B SER* 5.1 1.1 + - - +
161B TRP* 3.6 20.8 - - + -
162B GLU* 3.3 25.6 + - + +
163B HIS* 2.8 57.1 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with HIS 163 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
22A ILE* 3.8 15.2 - - - +
26A HIS* 3.1 21.5 + + - +
30A HIS* 3.6 24.8 - + + +
34A PHE* 5.5 2.5 - + - -
74A HIS* 4.7 0.9 - + - -
143A GLN* 4.6 4.5 - - - -
161A TRP* 3.4 31.1 - + + +
162A GLU* 1.3 75.8 - - - +
164A ALA* 1.3 75.7 + - - +
165A YOF 3.2 0.9 + - - -
166A YOF 4.4 2.2 + - - -
167A LEU 5.5 0.3 + - - -
500A MN 2.1 37.0 + - - -
162B GLU* 2.8 30.7 + - - +
166B YOF 3.6 44.3 + - + +
----------------------------------------------------------
Back to top of page
Residues in contact with ALA 164 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
18A ILE* 4.8 1.7 - - - +
22A ILE* 3.6 18.9 - - - +
26A HIS* 4.1 9.8 + - + -
77A PHE* 5.5 0.9 - - + -
159A ASP* 3.7 40.6 - - + +
161A TRP 3.0 15.5 + - - +
163A HIS* 1.3 84.8 - - - +
165A YOF 1.3 58.6 + - + +
176A YOF 3.6 24.4 - - + +
----------------------------------------------------------
Back to top of page
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
------------------------------------------------------------
Atomic class I II III IV V VI VII VIII
------------------------------------------------------------
I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
------------------------------------------------------------
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