Contacts of the helix formed by residues 321 - 325 (chain B) in PDB entry 4IRQ
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 THR 321 (chain B).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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220B ARG* 3.9 38.1 - - + +
222B TRP* 3.1 21.8 + - - -
316B CYS* 3.6 5.7 - - - -
317B ASP 3.0 11.8 + - - -
318B LYS 3.8 2.2 - - - -
320B ALA* 1.3 86.3 - - + +
322B PRO* 1.3 62.5 - - - +
323B TRP* 3.2 34.2 + - + -
324B CYS* 3.3 17.2 + - - -
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Residues in contact with PRO 322 (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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271B ILE* 5.3 4.2 - - - +
273B ALA* 6.2 2.0 - - + -
318B LYS* 3.2 26.9 - - + +
319B THR 3.9 5.6 - - - +
320B ALA 3.5 5.2 - - - +
321B THR* 1.3 82.3 - - - +
323B TRP* 1.3 75.9 + - + +
324B CYS* 2.9 12.5 + - + +
325B THR* 3.6 15.6 + - - -
326B PHE* 5.8 1.6 - - - -
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Residues in contact with TRP 323 (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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138B ARG* 3.0 30.0 + - - +
220B ARG* 3.0 34.6 + - + -
221B PHE* 4.7 0.6 - - - +
222B TRP* 3.8 17.0 - + + +
271B ILE* 4.0 20.2 - - + +
273B ALA* 4.7 7.0 - - + -
274B GLN* 3.4 64.9 - - + +
277B GLU* 3.8 36.6 - - + -
320B ALA 3.7 16.4 - - - -
321B THR* 3.2 19.5 - - + -
322B PRO* 1.3 99.0 - - + +
324B CYS* 1.3 58.1 + - - +
325B THR 3.3 3.0 + - - +
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Residues in contact with CYS 324 (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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137B PHE* 3.7 14.1 - - - +
138B ARG* 3.0 33.6 + - - +
222B TRP* 4.0 17.6 - - - +
316B CYS* 2.0 57.7 - - - -
318B LYS* 4.4 6.1 - - + -
321B THR 3.3 10.3 + - - +
322B PRO* 3.8 5.2 - - + +
323B TRP* 1.3 77.0 - - - +
325B THR* 1.3 71.6 + - + +
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Residues in contact with THR 325 (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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136B HIS 5.7 0.9 - - - +
137B PHE* 3.8 20.0 - - + +
138B ARG* 3.6 7.9 - - - +
271B ILE* 3.7 10.0 - - - +
318B LYS* 3.7 29.7 + - - +
322B PRO 3.6 12.3 + - - -
323B TRP 3.3 0.6 - - - -
324B CYS* 1.3 91.6 - - + +
326B PHE* 1.3 86.4 + - - +
327B SER 3.5 2.6 + - - +
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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