Contacts of the helix formed by residues 1871 - 1877 (chain A) in PDB entry 2IWO
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 GLY1871 (chain A).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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1844A SER 5.9 0.2 - - - -
1845A LEU 4.6 3.8 - - - -
1846A GLY* 4.6 3.6 - - - -
1868A HIS* 3.2 29.0 + - - -
1869A PRO 3.5 0.2 - - - -
1870A THR* 1.3 82.5 - - - +
1872A VAL* 1.3 65.2 - - - -
1873A ALA 3.3 2.9 - - - -
1874A ALA* 3.2 3.8 + - - +
1875A GLN* 3.0 23.8 + - - +
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Residues in contact with VAL1872 (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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1837A MET* 3.7 26.9 - - + -
1838A LYS 3.4 30.3 - - - +
1839A LYS 3.9 15.0 - - - -
1844A SER 4.0 10.7 + - - +
1845A LEU* 3.6 14.0 + - + +
1871A GLY* 1.3 71.6 - - - -
1873A ALA* 1.3 62.0 + - - +
1875A GLN* 3.1 25.8 + - - +
1876A THR* 3.2 15.0 + - + +
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Residues in contact with ALA1873 (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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1837A MET* 4.0 15.3 - - - -
1845A LEU 3.0 12.7 + - - +
1846A GLY 4.2 1.8 - - - +
1847A ILE* 3.2 35.2 - - + -
1867A MET* 3.8 10.5 - - + +
1871A GLY 3.3 0.2 - - - -
1872A VAL* 1.3 75.7 - - - +
1874A ALA* 1.3 60.3 + - - +
1876A THR* 2.7 24.9 + - - -
1877A GLN 3.9 0.7 + - - -
1879A LEU* 3.7 20.7 + - + +
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Residues in contact with ALA1874 (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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1846A GLY 5.3 0.2 + - - -
1867A MET* 3.5 16.8 - - + +
1868A HIS 3.5 14.3 + - - +
1869A PRO* 3.2 27.6 - - + +
1870A THR 4.6 0.7 - - - -
1871A GLY 3.2 9.4 + - - +
1873A ALA* 1.3 77.7 - - - +
1875A GLN* 1.3 62.8 + - + +
1877A GLN* 2.8 34.6 + - - +
1879A LEU 5.8 0.2 - - - -
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Residues in contact with GLN1875 (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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1870A THR* 2.9 28.0 + - - +
1871A GLY* 3.0 18.0 + - - +
1872A VAL* 3.1 17.6 + - - +
1874A ALA* 1.3 77.0 - - + +
1876A THR* 1.3 62.4 + - - +
1877A GLN* 3.3 8.6 + - - +
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Residues in contact with THR1876 (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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1835A VAL* 3.8 15.9 - - + -
1836A GLU 4.6 4.9 - - - +
1837A MET* 3.6 28.9 - - + -
1872A VAL* 3.2 16.3 + - + +
1873A ALA* 2.7 17.3 + - - +
1875A GLN* 1.3 78.4 - - - +
1877A GLN* 1.3 64.8 + - - +
1878A LYS* 3.0 25.2 + - - +
1879A LEU* 3.6 10.6 + - - +
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Residues in contact with GLN1877 (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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1873A ALA 3.9 0.6 + - - -
1874A ALA* 2.8 31.0 + - - +
1875A GLN* 3.8 7.8 - - - +
1876A THR* 1.3 80.1 + - - +
1878A LYS* 1.3 59.2 + - - +
1879A LEU 3.8 4.5 - - - +
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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