Contacts of the helix formed by residues 77 - 81 (chain B) in PDB entry 4IGM
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 PRO 77 (chain B).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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8B HIS* 3.9 12.1 - - + +
47B ARG* 5.8 0.9 - - - +
75B THR 3.4 5.1 - - - +
76B VAL* 1.3 92.5 - - + +
78B VAL* 1.3 56.1 + - - +
80B PHE* 2.8 60.7 + - + +
142B GLN* 4.3 2.0 - - - +
174B HIS* 3.6 39.5 - - + +
176B TRP* 3.7 26.1 - - + -
294B PHE* 5.3 1.6 - - + -
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Residues in contact with VAL 78 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
27B VAL* 4.0 20.1 - - + +
39B LEU* 4.8 2.5 - - + -
41B LYS* 3.6 27.5 + - - +
46B PHE* 3.7 35.4 - - + -
76B VAL* 3.1 23.2 + - + +
77B PRO* 1.3 78.1 - - - +
79B MET* 1.4 65.7 + - - +
80B PHE 3.3 0.7 + - - -
81B SER* 4.1 8.0 + - - -
83B TRP* 5.6 1.9 + - - -
176B TRP* 3.5 35.2 + - + +
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Residues in contact with MET 79 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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10B LEU* 3.9 17.3 - - + -
14B TRP* 3.8 31.6 - - + +
17B LEU* 5.1 1.8 - - + -
27B VAL* 3.7 34.5 - - + +
39B LEU* 6.2 0.2 - - - -
75B THR* 3.3 26.9 - - + +
76B VAL* 2.7 21.6 + - + +
78B VAL* 1.4 71.2 - - - +
80B PHE* 1.3 57.1 + - - +
81B SER* 2.6 25.1 + - - -
92B LEU* 3.9 21.7 - - + +
93B CYS* 6.0 1.0 - - - -
96B LEU* 3.8 29.6 - - + +
116B THR* 5.3 2.2 + - - +
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Residues in contact with PHE 80 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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75B THR* 4.7 2.7 - - + -
77B PRO* 2.8 39.7 + - + +
78B VAL 3.3 0.2 - - - -
79B MET* 1.3 77.0 - - - +
81B SER* 1.3 68.1 + - - +
82B TYR* 3.1 46.0 + + + +
89B THR* 3.5 10.6 - - - +
93B CYS* 5.1 2.8 - - - -
116B THR* 3.7 20.4 - - - -
117B LEU 4.7 1.2 - - - +
142B GLN* 4.0 36.8 - - + -
143B ILE 3.8 7.0 - - - -
144B GLY* 3.5 27.6 - - - -
174B HIS* 4.0 5.2 - - + -
176B TRP* 3.7 30.7 - + + -
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Residues in contact with SER 81 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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26B TRP* 3.5 28.0 - - - -
78B VAL 4.1 6.7 + - - -
79B MET* 2.6 25.3 + - - -
80B PHE* 1.3 76.4 - - - +
82B TYR* 1.3 57.5 + - - +
83B TRP* 3.2 23.3 + - - +
84B ALA 3.0 10.8 + - - -
89B THR* 2.8 32.5 + - - -
92B LEU* 3.4 14.6 - - - +
176B TRP* 6.2 0.2 - - - -
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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