Contacts of the helix formed by residues 121 - 129 (chain A) in PDB entry 2A1A
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 PRO 121 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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119A GLN 4.5 3.1 - - - +
120A ILE* 1.4 90.7 - - + +
122A LEU* 1.3 60.5 + - - +
123A GLU* 3.2 11.0 - - + +
124A GLU* 2.9 45.4 + - + +
125A LEU* 3.8 0.9 + - - +
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Residues in contact with LEU 122 (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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4A HIS* 3.8 27.6 - - + +
5A CYS* 4.0 13.0 - - + -
108A HIS* 3.7 29.6 - - + +
111A LEU* 3.7 43.3 - - + +
112A ARG* 3.9 11.4 - - + +
115A ALA* 4.2 11.2 - - + -
120A ILE 3.2 6.4 + - - -
121A PRO* 1.3 70.1 - - - +
123A GLU* 1.3 68.7 + - - +
124A GLU 3.1 0.9 + - - -
125A LEU* 3.2 15.0 + - + +
126A TYR* 3.4 14.9 + - + -
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Residues in contact with GLU 123 (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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4A HIS 4.7 2.9 - - - +
5A CYS* 3.3 34.2 - - + +
39A ASP* 5.5 1.2 - - - +
121A PRO* 3.2 8.9 + - + +
122A LEU* 1.3 83.6 + - - +
124A GLU* 1.3 50.6 + - - +
126A TYR* 3.2 11.3 + - - +
127A LYS* 2.8 45.5 + - + +
131A TRP* 5.0 7.3 - - + -
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Residues in contact with GLU 124 (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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120A ILE* 4.2 11.2 - - + -
121A PRO* 2.9 36.2 + - + +
123A GLU* 1.3 72.8 - - - +
125A LEU* 1.3 67.8 + - - +
127A LYS* 3.0 24.0 + - - +
128A THR* 2.9 47.6 + - - +
160A PRO* 4.3 12.7 - - + +
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Residues in contact with LEU 125 (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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111A LEU* 3.3 48.9 - - + +
114A CYS* 4.5 5.8 - - + -
115A ALA* 3.6 26.9 - - + +
120A ILE* 3.9 20.9 - - + -
121A PRO 3.8 0.4 + - - -
122A LEU* 3.2 13.1 + - + +
124A GLU* 1.3 77.7 - - - +
126A TYR* 1.3 55.4 + - - +
128A THR* 4.1 3.4 - - - -
129A ILE* 2.7 46.4 + - + +
130A ALA 4.5 0.2 - - - -
160A PRO* 3.9 17.5 - - + -
164A VAL* 4.1 19.3 - - + -
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Residues in contact with TYR 126 (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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5A CYS* 3.7 23.3 - - - -
6A ARG 4.2 1.6 - - - -
7A PHE* 3.3 36.7 - - + +
104A SER 4.5 1.6 + - - -
107A VAL* 4.5 5.0 - - + +
108A HIS* 2.8 44.3 + - - +
111A LEU* 3.9 20.9 - - + -
122A LEU* 3.4 20.5 + - + -
123A GLU* 3.2 10.9 + - - +
124A GLU 3.2 0.4 - - - -
125A LEU* 1.3 81.7 - - - +
127A LYS* 1.3 58.7 + - - +
130A ALA* 3.4 16.3 + - + +
131A TRP* 2.9 68.8 + + + -
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Residues in contact with LYS 127 (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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123A GLU* 2.8 31.6 + - + +
124A GLU* 3.0 25.2 + - - +
126A TYR* 1.3 72.8 - - - +
128A THR* 1.3 65.1 + - + +
131A TRP* 3.6 30.2 - - + +
132A PRO* 3.4 15.8 - - - +
135A ARG* 5.1 2.6 + - - -
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Residues in contact with THR 128 (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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124A GLU* 2.9 33.4 + - - +
127A LYS* 1.3 84.7 - - + +
129A ILE* 1.3 66.4 + - - +
132A PRO* 3.5 15.1 - - - +
157A ILE* 3.5 19.9 - - - +
158A GLU 3.4 23.9 + - - +
160A PRO* 3.5 23.4 - - + +
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Residues in contact with ILE 129 (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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111A LEU* 4.9 4.0 - - + -
125A LEU* 2.7 36.1 + - + +
127A LYS 3.7 0.4 - - - -
128A THR* 1.3 82.1 - - - +
130A ALA* 1.3 66.1 + - + +
131A TRP 3.4 1.8 - - - -
132A PRO* 3.4 1.8 - - - +
133A LEU* 3.1 45.6 + - + +
144A PHE* 4.4 8.3 - - + -
154A TRP* 4.2 3.8 - - + -
157A ILE* 3.4 26.6 - - + +
159A PRO* 3.8 15.7 - - + -
164A VAL* 5.9 1.3 - - + -
165A LEU* 3.7 18.2 - - + -
168A LEU* 3.8 27.4 - - + -
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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