Contacts of the helix formed by residues 274 - 278 (chain V) in PDB entry 1I84
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 LYS 274 (chain V).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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272V LEU* 2.4 36.2 + - + +
273V GLU* 1.3 65.4 - - - +
275V SER* 1.3 77.5 + - - +
276V ARG 3.3 0.2 - - - -
277V ALA* 3.1 16.9 - - - +
287V PHE* 3.8 11.0 - - - -
432V LYS* 4.1 38.3 + - + +
433V ALA* 4.6 6.7 - - - +
435V PHE* 3.9 23.6 - - + -
436V GLU* 4.0 35.0 + - + +
603V ASP* 3.9 26.5 + - - -
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Residues in contact with SER 275 (chain V).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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273V GLU* 3.0 8.7 - - - +
274V LYS* 1.3 90.1 + - - +
276V ARG* 1.3 54.3 + - - +
277V ALA* 2.4 16.5 + - - +
278V ILE* 2.9 24.3 + - - +
279V ARG 5.0 0.7 - - - -
432V LYS* 4.1 17.2 - - - +
478V GLU* 2.8 31.8 + - - +
600V LYS* 4.8 9.3 - - - +
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Residues in contact with ARG 276 (chain V).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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237V ALA* 4.1 13.1 - - - +
238V LYS 3.9 5.6 + - - -
239V THR* 4.6 3.6 - - - +
247V ARG* 3.5 24.3 - - - +
273V GLU* 2.6 34.2 + - - +
275V SER* 1.3 76.5 - - - +
277V ALA* 1.3 54.8 + - - +
278V ILE 3.0 3.8 - - - -
279V ARG 3.6 18.4 - - - +
280V GLN* 2.9 19.0 + - + +
281V ALA 5.9 0.2 - - - -
284V GLU* 2.6 39.9 + - - +
285V ARG 2.6 37.1 + - - -
286V THR* 2.9 23.1 - - - +
287V PHE* 3.2 34.1 - - + -
472V PHE* 5.4 1.8 - - - -
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Residues in contact with ALA 277 (chain V).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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274V LYS 3.1 18.2 + - - +
275V SER 2.4 15.2 + - - -
276V ARG* 1.3 73.1 - - - +
278V ILE* 1.3 59.5 + - + +
286V THR* 3.8 14.2 - - - +
287V PHE* 4.0 16.2 - - + -
290V PHE* 4.0 16.5 - - + -
315V PHE* 3.7 20.4 - - - +
359V VAL* 5.0 4.6 - - + +
432V LYS* 5.0 4.5 - - - -
435V PHE* 4.5 19.7 - - + -
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Residues in contact with ILE 278 (chain V).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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275V SER* 2.9 13.9 + - - +
277V ALA* 1.3 81.6 - - - +
279V ARG* 1.3 103.9 + - + +
280V GLN* 3.3 5.2 - - - -
314V THR 4.2 2.3 - - - +
315V PHE* 3.0 55.9 - - + +
428V GLU* 3.6 13.7 - - + +
431V ALA* 5.5 0.4 - - + -
432V LYS* 3.0 56.1 - - + +
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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