Contacts of the helix formed by residues 175 - 181 (chain C) in PDB entry 1CX2
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 175 (chain C).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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173C ASP* 2.9 16.1 + - - +
174C SER* 1.3 68.9 - - - +
176C GLU* 1.3 60.6 + - + +
177C VAL 2.8 6.4 + - - -
178C LEU* 3.3 27.3 - - + +
179C GLU* 2.8 58.5 + - - +
445C GLN* 3.0 31.1 + - - +
446C ALA* 5.9 0.6 - - - +
449C LYS* 3.8 27.0 - - + +
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Residues in contact with GLU 176 (chain C).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
173C ASP* 3.4 26.8 + - + +
174C SER 3.1 1.6 - - - -
175C LYS* 1.3 78.5 - - + +
177C VAL* 1.3 58.7 + - - +
179C GLU* 4.9 5.0 - - - +
180C LYS* 3.0 47.9 + - - +
490C GLU* 4.8 0.5 - - - +
494C LEU* 2.8 50.2 - - + +
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Residues in contact with VAL 177 (chain C).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
172C PRO* 3.9 13.0 - - + -
173C ASP 2.8 22.4 - - - +
174C SER* 2.7 6.0 + - - +
176C GLU* 1.3 83.5 - - - +
178C LEU* 1.3 59.1 + - - +
179C GLU 3.4 0.7 - - - -
181C VAL* 2.8 32.0 + - + +
182C LEU* 2.9 15.6 + - + +
452C ILE* 4.5 4.9 - - + -
456C ARG* 4.6 1.6 - - - +
491C LEU* 3.9 24.2 - - + -
494C LEU* 4.4 2.7 - - + -
495C TYR* 3.8 23.1 - - + +
505C PRO* 4.0 25.4 - - + -
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Residues in contact with LEU 178 (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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174C SER 2.6 19.8 + - - +
175C LYS* 3.3 43.7 - - + +
177C VAL* 1.3 71.7 - - - +
179C GLU* 1.3 51.5 + - + +
182C LEU* 3.0 19.4 + - + +
183C LEU* 2.6 58.8 + - + -
440C VAL* 5.6 0.2 - - + -
445C GLN* 3.7 23.3 - - + +
448C ALA* 4.6 7.6 - - + -
449C LYS* 3.5 31.6 - - + +
452C ILE* 4.1 5.7 - - + +
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Residues in contact with GLU 179 (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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175C LYS* 2.8 48.9 + - + +
176C GLU* 4.9 6.6 - - - +
178C LEU* 1.3 75.5 - - + +
180C LYS* 1.3 62.4 + - + +
183C LEU* 3.7 26.6 + - + -
185C ARG* 2.7 36.0 + - - +
445C GLN* 5.2 1.6 - - - +
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Residues in contact with LYS 180 (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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175C LYS 3.6 1.5 + - - +
176C GLU* 3.0 59.2 + - - +
177C VAL 3.8 0.2 + - - -
178C LEU 3.7 0.2 - - - -
179C GLU* 1.3 78.0 - - + +
181C VAL* 1.3 60.9 + - + +
185C ARG* 2.9 22.2 + - - +
438C ARG* 3.3 15.5 + - - +
490C GLU* 2.9 44.6 + - + +
494C LEU* 4.8 0.2 - - + -
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Residues in contact with VAL 181 (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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177C VAL* 2.8 21.4 + - + +
180C LYS* 1.3 76.1 - - + +
182C LEU* 1.3 65.0 + - + +
437C GLY* 4.3 0.9 - - - -
438C ARG* 2.9 31.1 + - - +
487C MET* 3.6 37.7 - - + +
490C GLU* 4.9 5.4 - - + -
491C LEU* 3.6 38.6 - - + +
494C LEU* 6.2 0.2 - - + -
509C VAL* 3.6 29.4 - - + -
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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