Contacts of the helix formed by residues 22 - 30 (chain A) in PDB entry 4QKB
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 GLY 22 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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20A GLY 3.2 1.7 - - - -
21A SER* 1.3 80.4 + - - +
23A PRO* 1.4 71.3 - - - +
24A SER* 3.1 8.7 + - - -
25A VAL* 3.3 18.0 - - - +
26A LEU* 3.4 15.3 - - - +
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Residues in contact with PRO 23 (chain A).
Click here for Legend to table.
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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22A GLY* 1.4 81.2 - - - +
24A SER* 1.3 61.2 + - - +
26A LEU* 3.7 17.9 - - + +
27A SER* 2.9 29.6 + - - -
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Residues in contact with SER 24 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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22A GLY* 3.1 3.2 - - - -
23A PRO* 1.3 79.3 - - - +
25A VAL* 1.3 60.8 + - - +
27A SER* 3.2 6.4 + - - -
28A ARG* 3.0 40.4 + - - +
153A GLU* 4.9 7.2 - - - -
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Residues in contact with VAL 25 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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21A SER* 3.5 25.8 - - - +
22A GLY* 3.3 14.1 - - - +
24A SER* 1.3 78.5 - - - +
26A LEU* 1.3 63.7 + - - +
28A ARG* 4.0 6.5 - - - +
29A LEU* 3.1 28.0 + - + +
153A GLU* 4.0 22.6 + - + +
154A TRP 3.6 13.2 - - - +
155A LEU* 4.0 18.2 - - + +
175A PHE* 3.7 34.8 - - + -
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Residues in contact with LEU 26 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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18A VAL* 4.3 17.5 - - + +
19A ARG* 4.4 1.1 - - - -
20A GLY* 3.7 22.0 - - - +
22A GLY 3.4 18.8 + - - +
23A PRO* 3.7 16.6 - - + +
24A SER 3.2 0.4 - - - -
25A VAL* 1.3 75.5 - - - +
27A SER* 1.3 64.9 + - - +
29A LEU* 3.5 1.1 + - - -
30A GLN* 3.1 26.9 + - - +
155A LEU* 3.7 22.7 - - + -
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Residues in contact with SER 27 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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23A PRO 2.9 18.7 + - - -
24A SER* 3.5 6.3 - - - -
26A LEU* 1.3 78.3 - - - +
28A ARG* 1.3 64.3 + - - +
29A LEU 3.2 1.0 + - - -
30A GLN* 3.3 29.7 - - - +
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Residues in contact with ARG 28 (chain A).
Click here for Legend to table.
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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24A SER* 3.0 27.5 + - - +
25A VAL* 4.2 6.5 - - - +
27A SER* 1.3 79.1 - - - +
29A LEU* 1.3 70.5 + - + +
30A GLN 3.6 0.2 - - - -
31A ASP 5.3 0.5 + - - -
32A ALA* 4.5 5.0 + - - +
153A GLU* 3.9 21.7 + - - -
170A SER* 5.4 2.4 + - - -
175A PHE* 5.9 3.0 - - - -
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Residues in contact with LEU 29 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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25A VAL* 3.1 22.5 + - + +
26A LEU* 3.8 2.2 - - - +
28A ARG* 1.3 92.3 - - + +
30A GLN* 1.3 64.0 + - - +
31A ASP 3.2 3.1 - - - -
32A ALA* 3.6 14.4 - - + -
33A ALA* 3.0 26.5 + - + +
145A LEU* 5.0 2.0 - - + -
155A LEU* 3.6 28.6 - - + +
170A SER* 3.6 32.5 - - - +
171A ALA* 4.0 15.7 - - + +
175A PHE* 3.8 34.5 - - + -
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Residues in contact with GLN 30 (chain A).
Click here for Legend to table.
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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26A LEU 3.1 12.2 + - - +
27A SER* 3.3 24.8 + - - +
28A ARG 3.6 0.6 - - - -
29A LEU* 1.3 77.9 - - - +
31A ASP* 1.3 79.0 + - - +
33A ALA 4.6 2.5 - - - +
34A VAL* 4.0 10.9 - - - +
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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