Contacts of the helix formed by residues 1972 - 1978 (chain A) in PDB entry 4M6W
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 ALA1972 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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1970A SER* 3.8 6.7 + - - +
1971A GLU* 1.3 75.2 - - - +
1973A LEU* 1.3 65.1 + - - +
1974A GLN 3.4 1.8 - - - -
1975A PHE* 3.4 13.0 + - + +
1976A TYR* 3.3 27.4 + - + -
1991A CYS* 4.0 7.2 - - + -
1997A VAL* 5.5 7.0 - - + -
210B PHE* 4.3 26.2 - - + -
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Residues in contact with LEU1973 (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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1964A VAL 5.1 9.6 - - - +
1970A SER 4.8 4.0 + - - +
1971A GLU* 3.1 15.4 - - - +
1972A ALA* 1.3 76.8 - - - +
1974A GLN* 1.3 64.9 + - - +
1976A TYR* 2.8 23.0 + - - +
1977A LEU* 2.9 31.7 + - + +
1984A TYR* 3.8 27.6 - - + +
1987A ALA* 3.7 33.7 - - + +
1988A LEU* 4.3 16.8 - - + +
1991A CYS* 3.6 17.1 - - - -
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Residues in contact with GLN1974 (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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1971A GLU* 3.3 32.1 + - + +
1972A ALA 3.4 0.8 - - - -
1973A LEU* 1.3 86.6 - - - +
1975A PHE* 1.3 61.5 + - - +
1977A LEU* 3.2 30.9 + - - +
1978A SER* 3.1 19.1 + - - -
165B GLN* 3.6 35.2 + - + +
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Residues in contact with PHE1975 (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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1972A ALA* 3.4 11.9 + - - +
1973A LEU 3.2 0.6 - - - -
1974A GLN* 1.3 79.0 - - - +
1976A TYR* 1.3 72.2 + + - +
1978A SER* 2.7 21.1 + - - -
1979A ILE* 4.0 10.1 - - + +
1997A VAL* 3.6 29.4 - - + -
2000A MET* 4.4 12.8 - - + -
2026A ILE* 5.2 1.8 - - + -
162B THR* 3.5 39.5 - - + +
163B VAL* 5.0 0.4 - - - -
165B GLN* 3.8 16.2 + - + +
166B ILE* 3.8 29.6 - - + -
184B ILE* 4.0 25.4 - - + -
210B PHE* 3.8 20.2 - + + -
211B PHE* 4.9 1.3 - + - -
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Residues in contact with TYR1976 (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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1972A ALA* 3.3 27.6 - - + -
1973A LEU 2.8 9.0 + - - +
1975A PHE* 1.3 84.2 - + - +
1977A LEU* 1.3 62.8 + - - +
1979A ILE* 3.3 27.7 + - + +
1982A ILE* 3.8 11.8 - - - +
1987A ALA* 3.9 22.9 - - + -
1990A MET* 3.7 33.7 + - + -
1991A CYS* 3.5 37.4 - - - -
1994A PHE* 4.5 1.7 - - - +
1996A SER 4.5 0.5 + - - -
1997A VAL* 3.4 31.5 + - + +
2000A MET* 3.8 37.1 - - + +
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Residues in contact with LEU1977 (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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1973A LEU* 2.9 33.4 + - + +
1974A GLN* 3.2 40.1 + - - +
1976A TYR* 1.3 77.8 - - - +
1978A SER* 1.3 59.7 + - - +
1979A ILE 3.2 9.3 + - - +
1982A ILE* 4.9 11.1 - - - +
1984A TYR* 4.0 33.7 - - + -
1987A ALA* 4.2 13.0 - - + -
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Residues in contact with SER1978 (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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1974A GLN 3.1 11.3 + - - -
1975A PHE* 2.7 22.8 + - - -
1976A TYR 3.2 0.2 - - - -
1977A LEU* 1.3 73.2 - - - +
1979A ILE* 1.3 62.5 + - - +
1980A PRO* 3.4 8.7 - - - +
2025A TYR* 3.9 1.0 + - - -
158B SER* 4.4 5.0 + - - +
161B ARG* 4.5 5.6 - - - +
162B THR* 2.7 46.0 + - - -
165B GLN* 4.3 13.5 - - - -
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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