Contacts of the helix formed by residues 175 - 185 (chain A) in PDB entry 1QK1
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 175 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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173A GLU 4.4 5.8 - - - +
174A MET* 1.3 76.4 - - - +
176A GLU* 1.3 58.8 + - - +
177A ALA* 3.4 9.8 + - - +
178A GLU* 3.0 41.9 + - - +
179A GLN* 2.8 28.7 + - - +
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Residues in contact with GLU 176 (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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175A THR* 1.3 73.7 - - - +
177A ALA* 1.3 61.1 + - - +
179A GLN* 3.8 17.4 - - - +
180A GLN* 3.1 24.4 + - - +
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Residues in contact with ALA 177 (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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175A THR* 3.1 8.8 + - - +
176A GLU* 1.3 80.2 - - - +
178A GLU* 1.3 65.1 + - + +
180A GLN* 3.3 4.8 + - - +
181A GLN* 3.0 22.5 + - - +
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Residues in contact with GLU 178 (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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167A ARG* 2.7 33.1 + - - -
169A TYR* 4.1 19.2 - - + +
173A GLU 4.2 2.3 - - - +
174A MET* 3.6 17.1 - - + +
175A THR* 3.0 41.9 + - + +
177A ALA* 1.3 76.9 - - + +
179A GLN* 1.3 62.5 + - - +
181A GLN* 3.2 7.6 + - - +
182A LEU* 3.0 28.0 + - - +
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Residues in contact with GLN 179 (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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174A MET* 3.6 37.7 + - + +
175A THR 2.8 16.0 + - - +
176A GLU* 3.8 20.8 - - - +
178A GLU* 1.3 77.5 - - - +
180A GLN* 1.3 60.6 + - - +
182A LEU* 3.3 4.0 + - - +
183A ILE* 3.0 37.1 + - + +
188A LEU* 4.0 14.9 - - + +
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Residues in contact with GLN 180 (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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176A GLU 3.1 15.8 + - - +
177A ALA* 3.6 5.8 - - - +
179A GLN* 1.3 76.5 - - - +
181A GLN* 1.3 67.2 + - - +
183A ILE* 3.2 20.1 + - - +
184A ASP* 3.0 52.2 + - - +
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Residues in contact with GLN 181 (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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169A TYR* 6.0 2.0 - - - +
177A ALA 3.0 13.6 + - - +
178A GLU* 3.2 11.2 + - - +
180A GLN* 1.3 75.4 - - - +
182A LEU* 1.3 65.7 + - + +
184A ASP* 3.1 16.1 + - - +
185A ASP* 2.9 55.5 + - - +
218A LYS* 3.4 15.0 - - - +
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Residues in contact with LEU 182 (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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169A TYR* 4.2 32.8 - - + +
174A MET* 3.6 31.0 - - - -
178A GLU 3.0 16.9 + - - +
179A GLN 3.7 4.3 - - - +
180A GLN 3.3 0.2 - - - -
181A GLN* 1.3 78.9 - - + +
183A ILE* 1.3 59.2 + - - +
185A ASP* 3.4 5.0 + - - +
186A HIS 3.1 2.9 + - - -
187A PHE* 2.9 48.2 + - + +
188A LEU* 3.4 15.6 + - + +
212A ILE* 4.2 19.3 - - + -
214A HIS* 4.1 22.9 - - + +
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Residues in contact with ILE 183 (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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179A GLN* 3.0 28.1 + - + +
180A GLN* 3.2 27.8 + - - +
182A LEU* 1.3 75.8 - - - +
184A ASP* 1.3 66.1 + - - +
186A HIS* 3.1 23.7 + - - +
188A LEU* 3.4 29.4 - - + -
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Residues in contact with ASP 184 (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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180A GLN* 3.0 41.3 + - - +
181A GLN* 3.1 19.4 + - - +
183A ILE* 1.3 81.5 - - - +
185A ASP* 1.3 60.3 + - - +
186A HIS* 3.4 16.1 + - - -
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Residues in contact with ASP 185 (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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181A GLN* 2.9 34.0 + - - +
182A LEU* 4.0 5.5 - - - +
183A ILE 3.3 0.2 - - - -
184A ASP* 1.3 75.3 - - - +
186A HIS* 1.3 72.2 + - - +
187A PHE* 3.4 39.1 - - + -
214A HIS* 5.2 1.2 + - - -
218A LYS* 2.9 44.6 + - - +
235A MET* 6.0 0.3 - - - +
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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