Contacts of the helix formed by residues 125 - 129 (chain T) in PDB entry 3EXG
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 ALA 125 (chain T).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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120Q LYS 4.7 2.0 - - - +
121Q GLY* 3.5 25.6 - - - +
124Q MET* 5.0 1.8 - - + -
125Q HIS* 4.2 11.7 - - + +
103R MET* 5.8 0.2 - - - -
123T GLY* 3.1 5.5 - - - +
124T VAL* 1.3 86.7 - - - +
126T ALA* 1.3 67.3 + - - +
127T GLN 3.4 1.1 - - - -
128T HIS 3.1 5.0 + - - -
129T SER* 3.0 19.5 + - - -
302T MET* 3.5 13.3 - - - +
303T PRO 4.3 7.7 + - - -
304T TYR* 4.4 12.6 - - + -
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Residues in contact with ALA 126 (chain T).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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125Q HIS* 4.8 0.2 + - - -
99R LYS* 3.2 26.0 + - + -
102R TYR* 5.4 0.7 - - + -
103R MET* 3.7 32.7 - - + -
125T ALA* 1.3 78.6 - - - +
127T GLN* 1.3 58.9 + - - +
128T HIS 3.2 1.1 + - - -
129T SER* 3.9 8.5 + - - -
130T GLN* 4.7 1.4 + - - +
266T TRP* 5.7 0.3 - - - -
301T PRO* 3.9 21.8 - - + -
302T MET* 3.1 22.3 + - - +
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Residues in contact with GLN 127 (chain T).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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125Q HIS* 3.4 24.1 + - + +
135Q ASN* 3.6 6.2 - - - +
136Q GLY* 2.6 34.0 + - - -
137Q ILE* 3.4 14.9 + - + +
95R ASN* 2.9 58.0 + - - +
96R SER* 4.8 1.4 - - - +
99R LYS* 4.2 0.9 - - + +
103R MET* 3.3 17.9 - - + +
84T ASN* 3.3 23.2 - - - +
125T ALA 3.1 0.8 + - - -
126T ALA* 1.3 76.2 - - - +
128T HIS* 1.3 74.0 + - + +
129T SER 3.7 0.7 - - - -
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Residues in contact with HIS 128 (chain T).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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61Q PHE* 3.8 22.0 - + + -
124Q MET* 3.6 22.6 - - + +
136Q GLY* 3.8 28.7 + - - -
82T THR* 5.0 6.3 - - + +
84T ASN* 3.1 21.1 + - - +
85T PHE* 3.4 35.4 - + - -
119T GLY 3.7 7.4 - - - +
121T SER* 4.7 2.1 + - - -
124T VAL* 3.1 40.8 + - + +
125T ALA 3.1 2.8 + - - -
127T GLN* 1.3 91.1 + - + +
129T SER* 1.3 61.0 + - - +
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Residues in contact with SER 129 (chain T).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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84T ASN* 3.5 0.2 + - - -
119T GLY 3.5 18.4 - - - -
120T ALA* 3.6 5.7 + - - +
121T SER 4.5 2.3 + - - -
124T VAL* 3.3 16.6 - - - +
125T ALA 3.0 16.7 + - - -
126T ALA 3.9 4.6 + - - -
127T GLN 3.7 0.4 - - - -
128T HIS* 1.3 74.9 - - - +
130T GLN* 1.3 64.6 + - - +
131T CYS 3.6 1.9 + - - -
302T MET* 3.5 48.4 - - - +
309T GLU* 5.1 0.9 + - - -
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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