Contacts of the helix formed by residues 164 - 172 (chain B) in PDB entry 2KAI
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 GLN 164 (chain B).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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132B LEU* 3.7 30.6 - - + +
163B LEU* 1.3 74.0 - - - +
165B ASN* 1.3 51.7 + - - +
166B THR* 2.7 45.5 + - + +
167B PHE* 2.8 40.0 + - + +
182B CYS* 4.0 0.6 - - - -
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Residues in contact with ASN 165 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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132B LEU* 5.2 0.2 - - - +
163B LEU 3.4 2.8 + - - -
164B GLN* 1.3 69.4 - - - +
166B THR* 1.3 58.2 + - - +
167B PHE 3.1 1.1 - - - -
168B CYS* 3.0 21.3 + - - +
169B ALA 3.3 7.8 + - - -
176B VAL* 3.8 26.9 - - + +
177B THR 3.4 24.9 - - - +
178B GLU* 5.0 1.6 - - - -
180B MET 3.3 18.9 + - - +
181B LEU* 3.8 1.4 - - - +
182B CYS* 3.5 25.3 - - - +
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Residues in contact with THR 166 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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164B GLN* 2.7 38.1 + - - +
165B ASN* 1.3 75.7 - - - +
167B PHE* 1.3 77.9 + - + +
169B ALA* 3.1 29.9 + - - +
170B ASP 4.2 1.6 + - - -
176B VAL* 5.7 0.2 - - - -
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Residues in contact with PHE 167 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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163B LEU* 4.1 9.0 - - + -
164B GLN* 2.8 36.6 + - + +
166B THR* 1.3 93.2 - - + +
168B CYS* 1.3 57.6 - - - +
169B ALA 3.3 1.3 + - - -
170B ASP* 4.6 8.6 + - - +
182B CYS* 3.8 12.1 - - - -
185B LEU* 3.7 37.7 - - + -
223B ASN* 5.0 4.9 - - - +
225B PRO* 3.6 22.8 - - + +
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Residues in contact with CYS 168 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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165B ASN 3.0 10.1 + - - +
167B PHE* 1.3 77.1 - - - +
169B ALA* 1.3 64.9 + - - +
170B ASP* 3.4 4.0 - - - +
174B ASP* 5.0 2.6 - - - +
176B VAL* 3.9 20.9 - - + +
182B CYS* 2.1 52.5 - - + -
215B TRP* 4.9 4.3 - - - -
225B PRO* 3.8 13.2 - - - -
226B SER 3.5 15.0 - - - -
227B ILE* 3.9 22.6 - - + +
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Residues in contact with ALA 169 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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165B ASN 3.3 2.0 + - - -
166B THR* 3.1 21.9 + - - +
168B CYS* 1.3 80.9 - - - +
170B ASP* 1.3 66.3 + - - +
171B ALA 3.3 0.3 + - - -
172B HIS* 2.9 53.9 + - + +
174B ASP* 4.0 4.2 - - - +
176B VAL* 3.7 8.5 - - + -
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Residues in contact with ASP 170 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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166B THR 4.2 2.2 + - - -
167B PHE 4.6 7.7 + - - +
168B CYS* 3.4 4.7 - - - +
169B ALA* 1.3 79.8 - - - +
171B ALA* 1.3 69.5 + - - +
172B HIS* 4.8 1.7 + - - -
174B ASP* 5.8 0.7 - - - +
223B ASN 4.8 6.3 - - - +
224B LYS* 2.9 36.8 + - + +
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Residues in contact with ALA 171 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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170B ASP* 1.3 90.1 - - - +
172B HIS* 1.3 69.7 + - - +
173B PRO* 3.6 16.1 - - + +
174B ASP* 4.9 1.0 + - - -
224B LYS* 5.8 2.0 - - - +
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Residues in contact with HIS 172 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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169B ALA* 2.9 43.6 + - + +
170B ASP 4.8 1.4 + - - +
171B ALA* 1.3 81.5 - - - +
173B PRO* 1.4 60.9 - - - +
174B ASP* 2.7 38.6 + - - -
175B LYS* 3.8 13.8 - - + +
176B VAL* 3.6 25.2 + - + +
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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