Contacts of the helix formed by residues 246 - 250 (chain A) in PDB entry 1XRB
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 ILE 246 (chain A).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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243A GLY* 3.3 25.1 - - - +
244A ARG 3.3 3.1 + - - +
245A LYS* 1.3 75.7 - - - +
247A ILE* 1.3 70.6 + - + +
249A ASP* 3.6 8.9 - - + +
250A THR* 3.2 20.8 + - - -
257A HIS* 3.2 37.6 - - + +
259A GLY 3.1 24.7 - - - +
260A GLY 3.7 21.3 - - - +
261A ALA* 3.8 12.1 - - + +
414A K 3.3 13.2 - - - -
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Residues in contact with ILE 247 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
244A ARG 5.2 0.2 + - - -
245A LYS* 3.4 0.8 - - - +
246A ILE* 1.3 80.3 - - + +
248A VAL* 1.3 67.0 + - + +
250A THR* 3.1 18.6 + - - +
252A GLY* 3.2 23.6 + - - -
253A GLY* 3.2 37.7 - - - +
255A ALA 5.1 4.3 - - - +
257A HIS* 4.0 31.6 - - + +
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Residues in contact with VAL 248 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
8A GLU* 4.2 26.2 - - + +
9A SER* 4.1 14.1 - - - +
10A VAL* 4.5 8.3 - - + +
17A LYS* 4.2 20.2 - - + -
138A ILE* 3.7 9.9 - - - +
142A HIS* 3.2 40.6 + - + +
245A LYS* 3.6 37.9 - - + +
247A ILE* 1.3 78.5 - - + +
249A ASP* 1.3 66.2 - - - +
250A THR 3.9 1.0 - - - +
357A TYR 5.8 1.1 - - - +
358A GLY 5.6 1.6 - - - +
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Residues in contact with ASP 249 (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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17A LYS* 2.8 37.6 + - - -
20A ASP* 4.1 7.8 - - - +
243A GLY* 6.0 1.6 - - - -
245A LYS 2.8 19.9 + - - +
246A ILE* 3.6 11.0 + - + +
248A VAL* 1.3 78.3 - - - +
250A THR* 1.3 62.0 + - + +
262A PHE* 5.0 9.7 + - + +
263A SER* 4.7 1.9 + - - -
354A THR 4.5 1.2 - - - +
355A ALA 4.4 0.7 - - - +
358A GLY* 3.9 5.7 + - - -
359A HIS* 3.0 62.8 + - + +
360A PHE 4.4 0.3 + - - -
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Residues in contact with THR 250 (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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123A PHE 5.7 1.8 - - - +
134A MSE 4.1 16.8 - - - +
138A ILE* 4.2 4.2 - - - +
142A HIS* 4.9 1.9 - - - -
246A ILE 3.2 8.0 + - - +
247A ILE* 3.1 16.5 + - - +
248A VAL 3.9 3.8 - - - +
249A ASP* 1.3 78.7 - - + +
251A TYR* 1.3 87.8 + - + +
252A GLY 3.7 0.4 + - - -
253A GLY 5.4 0.2 + - - -
255A ALA 5.7 1.0 + - - -
256A ARG 5.3 0.7 + - - -
257A HIS* 3.4 35.6 + - + +
262A PHE* 4.1 15.9 - - + -
358A GLY* 5.6 0.2 - - - -
359A HIS 5.3 0.2 + - - -
360A PHE* 3.9 22.7 + - + +
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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