Contacts of the helix formed by residues 256 - 259 (chain A) in PDB entry 1ASC
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 TYR 256 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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86A PHE* 3.2 39.7 + + - -
89A CYS 4.3 0.7 - - - -
90A THR* 2.8 39.8 + - + +
93A LEU* 3.9 23.2 - - + +
254A SER* 4.9 8.7 - - - -
255A SER* 1.3 75.3 + - - +
257A SER* 1.3 62.4 + - - +
258A LYS 3.4 2.7 - - - -
259A ASN* 3.3 13.2 - - - +
260A PHE* 3.2 55.4 - + + +
262A LEU* 3.5 6.8 - - - +
267A VAL* 3.1 29.5 + - + -
268A GLY* 4.6 2.2 - - - -
269A ALA* 4.9 0.7 - - + -
306A VAL* 4.1 13.2 - - + -
310A LEU* 4.6 3.4 - - + +
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Residues in contact with SER 257 (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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255A SER* 3.2 17.7 + - - -
256A TYR* 1.3 78.1 - - - +
258A LYS* 1.3 65.9 + - - +
261A GLY* 3.2 6.8 + - - -
262A LEU 2.9 23.0 + - - -
263A TYR* 3.4 39.2 + - - +
266A ARG* 3.6 15.3 + - - -
267A VAL 3.9 9.7 + - - -
409A NPL 3.2 14.3 + - - -
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Residues in contact with LYS 258 (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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46A GLY* 4.4 15.4 + - - +
47A VAL* 5.5 0.6 - - - +
225A ALA* 3.9 23.0 + - - +
226A TYR* 3.6 27.2 + - + -
229A PHE* 3.7 18.9 - - + -
255A SER* 4.8 0.4 + - - -
256A TYR 3.4 0.2 - - - -
257A SER* 1.3 86.1 - - - +
259A ASN* 1.3 62.7 + - - +
260A PHE 3.2 1.1 - - - -
261A GLY* 3.0 17.5 + - - -
263A TYR* 3.4 32.0 + - + -
326A MET* 4.2 6.4 - - - +
359A MET* 3.4 29.4 - - + -
409A NPL 3.8 35.7 + - - -
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Residues in contact with ASN 259 (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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93A LEU* 5.2 1.6 - - - +
225A ALA 5.5 0.9 + - - -
227A GLN* 2.8 42.6 + - - +
229A PHE* 3.6 10.8 - - + -
233A LEU* 4.6 7.1 - - - +
255A SER 4.3 6.9 + - - -
256A TYR* 3.3 27.5 - - - -
258A LYS* 1.3 79.6 - - + +
260A PHE* 1.3 84.7 + - - +
319A TRP* 2.9 24.0 + - + -
323A LEU* 3.6 15.7 - - + +
326A MET* 3.6 13.8 - - - +
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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