Contacts of the helix formed by residues 138 - 142 (chain A) in PDB entry 2EX4
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 VAL 138 (chain A).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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69A CYS 3.7 17.3 - - - +
70A GLY* 4.1 4.0 - - - -
120A LEU* 3.9 16.8 - - + +
135A ILE* 3.5 27.1 - - + -
136A GLN 3.2 7.2 - - - +
137A TRP* 1.3 79.7 - - - +
139A ILE* 1.3 64.1 + - - +
140A GLY 3.1 3.1 - - - -
141A HIS* 2.8 27.2 + - + +
142A LEU* 4.1 4.2 + - + +
168A ASP* 3.1 0.4 + - - -
1401A SAH 3.6 51.8 - - + +
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Residues in contact with ILE 139 (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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120A LEU* 6.1 0.2 - - - -
135A ILE* 3.7 26.2 - - + +
138A VAL* 1.3 77.7 - - - +
140A GLY* 1.3 62.9 + - - +
141A HIS 3.1 1.4 + - - -
142A LEU* 3.2 19.4 + - + +
147A LEU* 4.0 38.5 - - + +
166A ILE* 4.1 33.4 - - + -
168A ASP* 3.3 22.6 + - + +
169A ASN 5.8 0.9 - - - +
170A MET* 4.9 2.9 - - + -
186A ARG* 3.0 22.1 + - - +
191A VAL* 4.4 24.2 - - + -
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Residues in contact with GLY 140 (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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12A PHE* 3.5 6.6 - - - -
138A VAL* 3.1 1.8 + - - +
139A ILE* 1.3 81.5 - - - +
141A HIS* 1.3 58.0 + - - +
142A LEU 3.2 1.8 - - - -
168A ASP* 4.3 4.0 + - - -
183A SER* 3.3 9.6 - - - -
184A VAL* 2.8 49.0 + - - +
186A ARG* 3.8 8.3 - - - -
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Residues in contact with HIS 141 (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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12A PHE* 3.3 10.7 - - - -
13A TYR* 3.1 24.8 - - - -
16A ALA* 3.5 15.1 - - + +
20A TRP* 3.0 29.0 + + - -
137A TRP 4.8 4.3 - - - -
138A VAL* 2.8 24.4 + - + +
140A GLY* 1.3 77.3 - - - +
142A LEU* 1.3 61.8 + - + +
181A ASP* 3.1 32.5 + - - -
182A SER 3.1 17.4 + - - -
183A SER* 3.6 13.5 - - - -
1401A SAH 3.4 38.1 + + + +
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Residues in contact with LEU 142 (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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2A THR* 4.3 3.1 - - - +
12A PHE* 4.0 4.6 - - - -
13A TYR* 3.5 8.7 - - + +
120A LEU* 4.0 30.5 - - + -
121A GLN* 3.7 26.5 - - + +
138A VAL 4.9 2.2 - - - +
139A ILE* 3.2 13.9 + - + +
140A GLY 4.2 3.6 - - - +
141A HIS* 1.3 90.4 - - + +
143A THR* 1.3 61.5 + - - +
146A HIS* 4.1 12.6 - - + +
147A LEU* 3.9 31.9 - - + +
150A PHE* 4.3 11.0 - - + -
184A VAL* 4.4 0.5 - - - +
186A ARG* 2.7 27.9 + - - -
1401A SAH 3.8 10.1 - - + +
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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