Contacts of the helix formed by residues 267 - 273 (chain F) in PDB entry 1KQN
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 267 (chain F).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
55F TYR* 3.6 46.4 - - + +
56F LYS 4.1 2.5 - - - +
57F LYS* 3.7 36.1 - - + -
168F LEU* 4.3 21.3 - - + -
265F VAL 3.7 2.0 + - - -
266F ILE* 1.3 76.3 - - - +
268F ALA* 1.3 67.2 + - - +
269F PRO* 3.4 1.8 - - + -
270F LEU* 2.9 32.4 + - + +
271F GLN* 3.1 10.2 + - - +
782F NAD 5.3 0.2 - - + -
----------------------------------------------------------
Back to top of page
Residues in contact with ALA 268 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
54F ALA 3.5 15.7 - - - +
55F TYR 3.0 22.3 + - - +
56F LYS* 4.5 2.4 - - + +
92F TRP* 3.8 26.2 - - + -
266F ILE 3.5 2.9 + - - -
267F LEU* 1.3 66.6 - - - +
269F PRO* 1.3 74.2 - - + +
271F GLN* 3.0 8.4 + - - +
272F ARG* 2.9 27.1 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with PRO 269 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
55F TYR* 3.7 20.6 - - + -
92F TRP* 3.2 42.1 - - + -
167F ASN 4.3 0.2 - - - -
168F LEU* 3.6 30.7 - - + +
267F LEU* 3.5 5.2 - - + -
268F ALA* 1.3 96.1 - - + +
270F LEU* 1.3 57.2 + - - +
272F ARG* 3.9 1.1 - - + -
273F ASN* 2.9 39.8 + - - +
782F NAD 3.8 10.8 - - + -
----------------------------------------------------------
Back to top of page
Residues in contact with LEU 270 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
165F VAL* 5.2 6.7 - - + -
166F PRO 3.8 18.2 - - - +
167F ASN* 3.7 24.2 - - + +
168F LEU* 3.9 16.6 - - + -
266F ILE* 3.6 14.8 - - + -
267F LEU* 2.9 30.7 + - + +
269F PRO* 1.3 81.6 - - - +
271F GLN* 1.3 61.3 + - - +
273F ASN 4.0 0.5 - - - -
274F THR* 3.0 30.4 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with GLN 271 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
266F ILE* 3.3 38.3 - - + +
267F LEU 3.1 9.3 + - - +
268F ALA* 3.0 9.9 + - - +
270F LEU* 1.3 74.4 - - - +
272F ARG* 1.3 60.3 + - - +
274F THR* 3.2 5.5 + - - +
275F ALA* 2.9 49.3 + - + +
----------------------------------------------------------
Back to top of page
Residues in contact with ARG 272 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
91F GLU* 4.1 17.3 + - - +
92F TRP* 2.6 60.2 + - - +
93F LYS* 5.5 0.6 - - - +
94F GLU* 2.9 37.9 + - - -
97F LYS* 4.3 7.2 - - - +
268F ALA* 2.9 17.3 + - - +
269F PRO* 4.0 4.3 - - + +
271F GLN* 1.3 78.9 - - - +
273F ASN* 1.3 61.4 + - - +
274F THR 3.3 3.3 + - - -
275F ALA* 3.8 14.9 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with ASN 273 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
92F TRP* 5.4 2.6 - - - -
94F GLU* 4.7 5.1 + - - +
167F ASN* 3.2 35.4 + - + +
168F LEU 3.7 15.8 + - - -
169F TRP* 4.5 0.4 - - - +
170F LYS* 3.4 37.2 - - + +
269F PRO* 2.9 27.3 + - - +
270F LEU 4.0 0.7 - - - +
272F ARG* 1.3 82.9 - - - +
274F THR* 1.3 61.7 + - - +
782F NAD 4.8 2.6 + - - -
----------------------------------------------------------
Back to top of page
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
------------------------------------------------------------
Atomic class I II III IV V VI VII VIII
------------------------------------------------------------
I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
------------------------------------------------------------
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