Contacts of the helix formed by residues 167 - 170 (chain D) in PDB entry 2IBT
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 THR 167 (chain D).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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143D TYR* 2.7 22.5 + - - -
165D PRO* 3.1 14.3 - - + -
166D ALA* 1.3 77.4 - - - +
168D TRP* 1.3 57.9 + - - +
169D LEU 3.1 1.1 + - - -
170D VAL* 3.2 4.0 + - - +
171D LEU* 3.0 41.4 + - - +
174D PHE* 3.5 5.1 - - - -
201D VAL* 6.0 1.3 - - + -
202D SER 5.6 0.4 - - - +
391D PHE 3.5 17.5 - - - +
392D VAL* 3.6 16.8 - - + -
393D PRO* 5.7 1.1 - - + -
5E G 2.8 32.6 + - - +
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Residues in contact with TRP 168 (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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143D TYR* 3.0 28.1 + + + +
147D LEU* 5.1 2.7 - - + -
164D VAL* 3.4 14.2 - - + +
165D PRO 3.0 27.6 + - - -
167D THR* 1.3 73.9 - - - +
169D LEU* 1.3 73.8 + - + +
170D VAL 3.1 0.4 - - - -
174D PHE* 3.5 30.9 - - + +
177D LEU* 4.3 9.6 - - + -
178D ARG* 2.9 40.9 + - + +
181D LEU* 3.8 22.0 - - + -
187D THR* 4.4 3.6 - - + -
189D VAL* 3.7 27.4 - - + -
204D VAL* 3.5 9.6 - - + +
206D ILE* 4.1 30.5 - - + -
238D TRP* 4.4 3.8 - + - -
243D ILE* 3.9 17.7 - - + -
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Residues in contact with LEU 169 (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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166D ALA 3.0 20.7 + - - +
168D TRP* 1.3 116.5 - - + +
170D VAL* 1.3 57.2 + - - +
178D ARG* 3.8 3.9 - - - +
189D VAL* 4.2 18.2 - - + -
191D TYR* 6.4 0.2 - - + -
204D VAL* 4.2 10.3 - - + -
217D LEU* 4.9 3.6 - - + -
242D ILE* 3.4 5.7 - - - -
243D ILE* 2.8 64.5 + - + +
245D PHE* 5.4 0.7 - - + -
391D PHE* 3.6 38.8 - - + -
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Residues in contact with VAL 170 (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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167D THR 3.7 7.4 - - - +
169D LEU* 1.3 84.3 - - - +
171D LEU* 1.3 71.5 + - + +
172D GLU 3.7 1.0 + - - -
178D ARG* 3.8 3.4 - - - -
242D ILE* 3.6 36.2 - - + +
243D ILE 3.6 17.7 - - - +
388D TYR* 4.0 16.6 - - + -
391D PHE* 3.6 25.1 - - + -
392D VAL* 4.1 22.0 - - + -
396D THR* 5.2 3.2 + - - +
398D ARG* 4.8 6.6 - - - +
399D MET* 4.2 18.2 - - + -
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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