Contacts of the helix formed by residues 145 - 149 (chain I) in PDB entry 2A3W
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 ASP 145 (chain I).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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16I VAL* 4.1 1.1 - - - -
135I GLN* 3.8 6.5 + - - +
136I GLU 4.1 4.1 + - - +
138I ASP* 5.0 3.5 - - - +
144I PHE* 1.3 77.6 - - - +
146I ARG* 1.3 58.2 + - - +
147I SER* 2.9 28.3 + - - -
148I GLN* 2.8 56.7 + - - +
149I SER 3.2 7.8 + - - -
318I CA 4.3 4.9 - - - -
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Residues in contact with ARG 146 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
14I GLU* 3.2 55.4 + - + +
15I SER* 3.5 33.5 - - - +
16I VAL* 3.7 17.0 - - + +
45I ARG* 3.4 6.6 + - - -
145I ASP* 1.3 74.6 + - - +
147I SER* 1.3 57.2 + - - +
148I GLN 3.0 3.0 + - - -
149I SER* 2.7 22.9 + - - -
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Residues in contact with SER 147 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
14I GLU* 5.5 1.1 - - - -
45I ARG* 3.1 28.2 + - - +
46I ALA* 3.2 10.9 + - - +
145I ASP* 2.9 26.1 + - - -
146I ARG* 1.3 77.7 - - - +
148I GLN* 1.3 61.1 + - - +
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Residues in contact with GLN 148 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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342B CPJ 2.8 38.9 + - - +
45I ARG* 3.6 2.7 - - - +
46I ALA 3.9 4.7 - - - -
47I TYR* 4.1 0.9 - - - +
48I SER* 3.1 25.3 + - - +
64I TYR* 3.1 28.8 + - + +
135I GLN 5.0 0.2 - - - -
136I GLU* 3.4 23.5 + - + +
145I ASP* 2.8 30.1 + - - +
147I SER* 1.3 83.2 - - - +
149I SER* 1.3 66.7 + - - +
150I PHE 3.6 0.3 + - - -
318I CA 2.4 24.9 - - - -
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Residues in contact with SER 149 (chain I).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
13I ARG 5.7 0.4 - - - -
14I GLU* 3.6 8.8 - - - +
15I SER 3.3 26.8 + - - -
43I LEU* 3.6 4.5 - - - +
45I ARG* 2.9 36.1 + - - +
47I TYR* 3.6 1.6 - - - +
134I GLY 3.4 9.9 - - - -
135I GLN* 3.5 17.0 - - - +
145I ASP 3.2 2.4 + - - -
146I ARG 2.7 19.4 + - - -
148I GLN* 1.3 78.8 - - - +
150I PHE* 1.3 64.2 + - - +
151I VAL* 4.3 0.8 - - - +
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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