Contacts of the helix formed by residues 318 - 323 (chain B) in PDB entry 2IHM
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 318 (chain B).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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316B THR* 3.5 2.6 + - + -
317B LEU* 1.3 82.8 - - - +
319B GLY* 1.3 68.7 + - - +
320B GLY 3.9 0.2 + - - -
321B PHE* 3.9 4.0 + - - +
322B ARG* 3.6 14.8 + - - +
332B ASP* 3.1 35.7 + - - +
333B PHE* 3.8 5.7 + - - -
334B LEU* 3.9 20.8 - - + +
433B LEU* 3.4 33.7 - - + -
436B TRP* 3.5 26.2 + - + +
437B THR* 4.4 2.5 - - - +
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Residues in contact with GLY 319 (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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638A D3T 3.7 5.6 - - - -
318B THR* 1.3 80.5 + - - +
320B GLY* 1.3 66.7 + - - -
322B ARG* 3.2 10.9 + - - +
323B ARG* 3.4 6.1 + - - -
332B ASP* 3.6 17.9 - - - -
436B TRP 2.9 18.0 + - - -
437B THR* 3.1 21.0 - - - +
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Residues in contact with GLY 320 (chain B).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
638A D3T 2.8 23.9 + - - -
319B GLY* 1.3 71.6 - - - -
321B PHE* 1.3 62.6 + - - +
323B ARG* 2.9 38.7 + - - +
324B GLY 3.3 0.3 + - - -
325B LYS* 3.2 31.1 + - - +
800B MG 4.1 0.8 - - - -
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Residues in contact with PHE 321 (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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638A D3T 5.2 0.8 + - - -
290B VAL* 3.1 29.2 - - + -
291B ARG 3.9 6.1 - - - -
292B ARG* 3.2 52.0 + - - +
295B ALA* 3.8 18.6 - - + -
317B LEU* 4.2 17.7 - - + -
318B THR 4.1 7.6 - - - +
319B GLY 3.2 0.6 - - - -
320B GLY* 1.3 77.5 - - - +
322B ARG* 1.3 62.0 + - - +
324B GLY* 3.1 9.7 + - - -
325B LYS 3.3 17.5 - - - -
327B GLN* 3.6 28.7 + - - -
328B GLY* 4.3 3.4 - - - -
330B ASP 3.7 22.9 - - - -
331B VAL* 4.2 15.5 - - + -
332B ASP 5.5 0.4 - - - -
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Residues in contact with ARG 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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292B ARG* 5.2 2.4 + - - +
316B THR* 4.8 4.1 - - - +
317B LEU* 3.3 30.0 + - - +
318B THR* 3.6 7.3 + - - +
319B GLY 3.2 9.5 + - - +
320B GLY 3.2 0.8 - - - -
321B PHE* 1.3 78.3 - - - +
323B ARG* 1.3 58.8 + - - +
324B GLY* 2.9 6.3 + - - -
433B LEU* 3.5 28.5 - - - +
437B THR* 3.1 29.1 + - + +
477B GLU* 3.1 30.3 + - - -
488B TYR* 5.3 1.2 + - - -
491B PRO* 3.3 38.9 - - + +
492B GLU* 4.8 3.8 - - - +
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Residues in contact with ARG 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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638A D3T 3.0 28.7 + - - -
149B LEU* 4.7 2.6 - - - +
319B GLY 3.4 0.6 + - - +
320B GLY* 2.9 19.0 + - - +
322B ARG* 1.3 75.4 - - - +
324B GLY* 1.3 56.5 + - - +
325B LYS* 3.6 19.5 - - - +
437B THR* 2.7 56.0 + - + +
438B GLY* 3.6 24.7 - - - -
439B SER* 3.7 14.8 - - - +
491B PRO* 3.8 16.2 - - - +
492B GLU* 3.4 23.0 - - - +
494B ARG* 3.6 19.1 + - - -
495B ASN* 2.7 41.3 + - - +
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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