Contacts of the helix formed by residues 125 - 129 (chain P) 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 P).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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120M LYS 5.0 1.6 - - - +
121M GLY 3.7 13.2 - - - +
124M MET* 4.5 2.0 - - + -
125M HIS* 3.3 29.8 - - + +
123P GLY 3.5 5.7 - - - +
124P VAL* 1.3 84.7 - - - +
126P ALA* 1.3 66.0 + - - +
127P GLN 3.4 1.1 + - - -
128P HIS 3.4 2.6 + - - -
129P SER* 2.9 23.4 + - - -
302P MET* 3.6 13.5 - - - +
303P PRO 4.5 10.6 + - - -
304P TYR* 4.8 5.1 - - + +
309P GLU* 5.3 0.4 + - - -
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Residues in contact with ALA 126 (chain P).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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120M LYS 5.6 0.2 + - - -
125M HIS* 4.2 1.0 + - - -
99N LYS* 3.1 26.9 + - + -
102N TYR* 5.4 0.2 - - + -
103N MET* 3.7 26.6 - - + +
125P ALA* 1.3 78.1 - - - +
127P GLN* 1.3 59.3 + - - +
128P HIS 3.2 1.3 + - - -
129P SER* 3.9 5.7 + - - -
130P GLN* 4.6 1.9 + - - +
301P PRO* 3.8 26.0 - - + -
302P MET* 3.2 24.1 + - - +
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Residues in contact with GLN 127 (chain P).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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125M HIS* 3.4 22.4 + - + -
135M ASN* 4.7 6.1 + - - +
136M GLY* 2.7 36.1 + - - +
137M ILE* 3.7 19.3 + - + +
95N ASN* 2.9 52.8 + - - +
96N SER* 4.9 2.2 + - - +
99N LYS* 5.1 0.7 - - + -
100N THR* 5.5 0.2 + - - -
103N MET* 3.7 17.9 - - - +
84P ASN* 3.1 24.4 - - - +
125P ALA 3.4 1.2 + - - -
126P ALA* 1.3 77.4 - - + +
128P HIS* 1.3 68.2 + - - +
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Residues in contact with HIS 128 (chain P).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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61M PHE* 3.7 25.5 - + + -
124M MET* 3.3 28.4 - - + +
136M GLY* 3.3 36.1 + - - -
137M ILE* 4.1 7.6 - - + -
82P THR* 5.2 6.1 - - + +
84P ASN* 3.0 19.3 + - - +
85P PHE* 3.4 30.3 - + - -
119P GLY 4.1 3.8 - - - +
121P SER* 4.3 3.6 - - - -
124P VAL* 3.5 32.0 + - + +
125P ALA 3.4 1.0 + - - -
126P ALA 3.2 0.6 - - - -
127P GLN* 1.3 84.6 - - + +
129P SER* 1.3 59.4 + - - +
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Residues in contact with SER 129 (chain P).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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119P GLY 3.2 24.5 - - - +
120P ALA* 3.7 7.0 + - - +
121P SER 4.3 4.0 + - - -
122P ALA 5.4 0.2 + - - -
124P VAL* 3.5 14.2 - - - +
125P ALA 2.9 21.9 + - - -
126P ALA 3.9 2.8 + - - -
127P GLN 3.6 0.6 - - - -
128P HIS* 1.3 77.8 - - - +
130P GLN* 1.3 62.8 + - - +
131P CYS 3.8 0.9 + - - -
302P MET* 3.6 38.1 - - - +
309P GLU* 5.5 1.0 + - - -
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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