Contacts of the strand formed by residues 23 - 26 (chain A) in PDB entry 4I6J
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 SER 23 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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21A ALA 3.0 7.5 + - - -
22A SER* 1.3 71.0 - - - +
24A VAL* 1.3 58.9 + - - +
42A ALA* 2.1 39.2 + - - -
46A ALA 5.0 0.9 + - - -
48A CYS 2.8 14.1 + - - -
49A VAL* 3.1 31.1 - - - +
50A ARG 3.2 2.3 + - - -
113A ARG* 3.0 34.3 - - - -
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Residues in contact with VAL 24 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
22A SER* 3.8 1.7 + - - +
23A SER* 1.3 74.3 - - - +
25A HIS* 1.3 66.2 + - - +
26A TRP 4.7 0.2 - - - +
42A ALA* 4.6 2.0 - - - -
50A ARG* 3.3 14.6 - - + +
52A VAL* 3.9 21.3 - - + -
102A PHE* 4.5 9.6 - - + -
106A PHE* 5.8 1.1 - - + -
109A TRP* 3.9 27.8 - - + -
111A VAL* 3.5 26.2 - - + -
113A ARG 2.8 8.4 + - - +
114A LEU* 3.3 23.9 - - + +
115A THR* 3.0 25.6 + - - +
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Residues in contact with HIS 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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23A SER 4.0 1.4 + - - -
24A VAL* 1.3 76.6 - - - +
26A TRP* 1.3 68.2 + - - +
27A PHE* 3.9 22.7 + + - -
36A ASN* 3.4 25.8 + - - -
38A ALA* 3.8 12.1 - - + -
39A LEU* 3.4 33.9 - - + -
42A ALA* 3.9 13.7 - - + -
49A VAL* 5.1 0.9 - - + -
50A ARG 2.8 12.6 + - - +
51A CYS* 3.5 6.3 - - - +
52A VAL* 2.9 29.5 + - - +
115A THR* 2.8 38.1 + - - -
116A PHE* 3.8 14.1 - - - -
117A GLU* 4.5 2.9 - - + -
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Residues in contact with TRP 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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25A HIS* 1.3 80.7 + - - +
27A PHE* 1.3 77.9 + - - +
28A ARG* 3.3 45.9 + - + +
52A VAL* 3.6 19.3 - - + -
54A ILE* 3.7 19.8 + - + +
98A PRO* 4.0 19.5 - - + -
102A PHE* 3.5 33.0 - + + -
114A LEU* 4.0 11.7 - - + -
115A THR 2.8 16.6 + - - +
116A PHE* 3.3 39.2 - + + +
117A GLU 4.6 1.4 + - - -
127A ARG* 4.0 21.3 - - - -
128A ASP* 4.2 4.9 - - - -
131A ILE* 4.4 14.1 - - + -
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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