Contacts of the helix formed by residues 423 - 427 (chain A) in PDB entry 1Q2L
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 423 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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303A PHE* 4.0 18.4 - - + -
422A VAL* 1.3 97.8 - - + +
424A VAL* 1.3 59.8 + - - +
425A GLU* 3.1 30.5 - - + +
426A HIS* 2.8 26.0 + - + -
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Residues in contact with VAL 424 (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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30A ILE* 4.6 15.3 - - + -
31A GLN 5.6 0.4 - - - +
32A GLU* 5.5 1.8 - - + -
34A ILE* 4.0 9.2 - - + +
46A ALA* 3.5 35.4 - - + -
54A VAL* 4.3 14.4 - - + -
56A LEU* 4.4 10.3 - - + -
419A MET* 4.3 24.0 - - + +
422A VAL 3.3 4.0 + - - -
423A PRO* 1.3 71.0 - - - +
425A GLU* 1.3 71.2 + - + +
426A HIS 3.0 0.2 - - - -
427A THR* 2.7 33.3 + - - +
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Residues in contact with GLU 425 (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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32A GLU* 3.8 37.5 - - + +
33A THR 3.7 15.9 - - - +
34A ILE* 3.8 12.6 - - - +
35A ARG* 3.0 43.0 + - - +
423A PRO* 3.3 26.3 - - - +
424A VAL* 1.3 83.2 + - - +
426A HIS* 1.3 74.4 + - + +
427A THR 3.5 0.4 - - - -
2005A PT 4.5 1.6 - - - -
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Residues in contact with HIS 426 (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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35A ARG* 3.7 30.5 - - + +
303A PHE* 3.7 28.0 - + + -
304A ARG* 4.2 6.7 + - - -
422A VAL* 3.8 10.5 - - + -
423A PRO* 2.8 21.2 + - + +
425A GLU* 1.3 91.4 + - + +
427A THR* 1.3 63.1 + - - +
428A LEU 3.1 3.1 - - - +
429A ASP* 3.9 11.3 - - - +
430A ALA* 2.9 25.4 + - - +
433A ILE* 3.8 25.8 - - + +
2005A PT 2.3 30.8 - - - -
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Residues in contact with THR 427 (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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34A ILE* 5.1 1.8 - - - +
56A LEU* 3.9 22.2 - - + -
414A TRP* 4.3 10.9 - - - -
415A LEU* 3.6 33.9 - - + +
418A THR* 3.6 25.3 + - - +
419A MET* 3.7 15.1 - - + +
422A VAL* 4.4 1.3 - - - +
423A PRO 3.7 1.4 + - - -
424A VAL* 2.7 40.0 + - - +
425A GLU 3.5 0.6 - - - -
426A HIS* 1.3 77.4 - - - +
428A LEU* 1.3 63.0 + - + +
430A ALA* 4.5 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