Contacts of the helix formed by residues 349 - 353 (chain C) in PDB entry 3IXK
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 LEU 349 (chain C).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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330C VAL* 3.7 24.5 - - + -
347C THR* 4.9 2.2 - - + +
348C ILE* 1.3 75.6 - - - +
350C PRO* 1.3 67.8 - - + +
351C GLN* 2.9 16.2 - - + +
352C GLN* 2.7 39.4 + - - +
353C TYR* 3.3 9.8 + - - -
408C HIS* 4.5 1.1 - - + -
409C VAL 4.2 5.2 - - - +
410C HIS* 3.9 20.2 - - + -
411C ASP* 4.9 0.9 - - - +
414C ARG* 3.9 23.1 - - + +
415C THR* 3.4 42.2 - - - +
416C ALA* 3.6 7.6 - - - +
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Residues in contact with PRO 350 (chain C).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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325C TRP* 3.9 17.0 - - + +
328C PHE* 3.5 28.5 - - + -
329C PRO 4.0 14.8 - - - +
330C VAL* 4.8 0.2 - - + -
349C LEU* 1.3 87.4 - - + +
351C GLN* 1.3 71.2 + - - +
353C TYR* 3.4 18.8 - - + +
354C LEU* 2.9 33.8 + - + +
414C ARG* 3.4 30.1 - - - +
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Residues in contact with GLN 351 (chain C).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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325C TRP* 3.6 46.9 - - + +
349C LEU* 2.9 17.1 - - + +
350C PRO* 1.3 85.7 - - - +
352C GLN* 1.3 59.9 + - - +
354C LEU 3.6 11.6 - - - +
356C PRO* 5.7 1.7 - - - +
409C VAL* 3.5 43.2 - - + +
410C HIS* 3.8 8.9 + - - -
411C ASP* 3.3 42.8 + - - +
414C ARG* 5.1 0.2 + - - -
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Residues in contact with GLN 352 (chain C).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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348C ILE* 3.6 18.3 - - + +
349C LEU* 2.7 49.0 + - - +
351C GLN* 1.3 79.8 - - - +
353C TYR* 1.3 61.6 + - - +
354C LEU 3.4 3.0 + - - -
355C ARG* 4.7 5.0 - - - +
384C VAL* 3.3 44.3 - - - +
387C GLU* 4.6 14.0 - - + +
388C GLY* 4.2 22.2 - - - +
408C HIS* 4.1 4.7 + - - +
409C VAL* 3.2 29.7 + - - +
416C ALA* 4.5 7.3 - - - +
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Residues in contact with TYR 353 (chain C).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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296C ILE* 4.6 9.2 - - + -
328C PHE* 3.6 12.3 - + - +
329C PRO* 2.7 49.7 + - - +
331C ILE* 3.5 27.8 - - + -
348C ILE* 3.9 7.6 - - + -
349C LEU 3.3 17.0 + - - -
350C PRO* 3.1 22.1 + - + -
352C GLN* 1.3 79.6 - - - +
354C LEU* 1.3 71.3 + - + +
355C ARG 3.9 1.1 - - - -
370C PHE* 3.8 17.0 - + - -
371C ALA* 2.9 28.2 + - - -
372C ILE* 3.7 29.6 - - + -
384C VAL* 3.9 15.0 - - + -
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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