Contacts of the helix formed by residues 194 - 198 (chain A) in PDB entry 4XIQ
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 194 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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41A LYS* 3.5 37.5 - - - +
144A VAL* 3.7 36.3 - - + +
190A LEU* 3.4 14.7 - - + +
191A LYS* 2.9 20.5 + - + +
193A ASP* 1.4 107.9 + - - +
195A THR* 1.4 56.5 + - - +
196A GLU* 3.2 16.6 + - - +
197A TYR* 3.3 38.4 + - + -
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Residues in contact with THR 195 (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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84A LYS* 5.5 0.7 - - - -
87A ARG* 3.8 33.0 - - + +
190A LEU* 4.6 1.1 - - - -
192A GLU 3.6 20.5 + - - +
193A ASP 3.6 1.8 - - - -
194A GLN* 1.4 71.7 - - - +
196A GLU* 1.4 62.1 + - - +
197A TYR 3.2 2.9 - - - -
198A LEU* 3.1 33.6 + - + +
199A GLU* 4.1 8.2 + - - +
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Residues in contact with GLU 196 (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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193A ASP 4.7 7.0 + - - +
194A GLN* 4.5 7.3 - - - +
195A THR* 1.4 76.3 + - - +
197A TYR* 1.4 85.0 + - + +
198A LEU 3.1 5.0 + - - -
199A GLU* 3.1 31.9 + - - +
202A ARG* 2.8 58.5 + - + +
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Residues in contact with TYR 197 (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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39A SER 5.3 1.0 + - - -
41A LYS* 3.9 7.4 + - - +
42A GLU* 3.4 21.7 + - - -
44A PHE* 3.6 32.1 - + + -
89A LEU* 3.6 17.3 - - + +
144A VAL* 3.6 20.4 - - + -
190A LEU* 4.2 7.9 - - + -
194A GLN* 3.3 43.9 + - - +
195A THR 3.2 1.2 - - - -
196A GLU* 1.4 91.6 + - + +
198A LEU* 1.4 58.2 + - - +
199A GLU 3.6 0.4 - - - -
202A ARG* 3.4 23.7 + - + -
203A ILE* 3.3 25.1 - - + +
206A ILE* 3.5 31.9 - - + -
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Residues in contact with LEU 198 (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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82A PRO* 3.5 23.9 - - + +
83A ASN 3.9 9.9 - - - +
84A LYS* 3.8 49.4 - - + +
87A ARG* 4.0 26.7 - - + -
88A THR 3.2 36.3 - - - +
89A LEU 4.2 0.7 - - - +
190A LEU* 3.8 17.7 - - + -
195A THR* 3.1 25.3 + - + +
197A TYR* 1.4 78.1 - - - +
199A GLU* 1.4 59.9 + - - +
200A GLU 3.8 1.9 + - - -
203A ILE* 4.0 2.7 - - - -
223A GLU* 4.2 1.9 - - - +
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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