Contacts of the helix formed by residues 140 - 145 (chain A) in PDB entry 4U7C
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 ASN 140 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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110A ALA* 4.4 7.6 - - + -
113A ALA* 3.9 9.1 - - + +
117A MET* 3.8 28.1 - - + +
126A LYS 2.7 29.5 + - - -
128A ILE* 3.1 26.7 + - + +
139A SER* 1.3 75.8 - - - +
141A TYR* 1.3 52.5 + - - +
142A HIS* 3.7 10.8 - - - +
143A ALA* 2.7 36.2 + - - +
144A ARG* 2.7 31.7 + - - +
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Residues in contact with TYR 141 (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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109A ASP* 4.7 1.1 - - + -
110A ALA* 3.7 29.3 + - + -
140A ASN* 1.3 72.0 - - + +
142A HIS* 1.3 66.0 + - - +
144A ARG* 2.9 38.5 + - + +
145A ARG* 3.0 19.8 + - - +
328A LYS* 3.6 15.0 - - + +
329A PRO* 3.6 48.4 - - + +
602A 0KX 2.3 29.2 + - - -
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Residues in contact with HIS 142 (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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117A MET* 6.4 0.4 - - + -
124A LYS 4.7 3.6 - - - -
125A ASP* 3.3 38.3 + - - +
126A LYS 3.9 7.9 - - - +
127A PRO* 4.0 9.4 - - + +
140A ASN* 3.6 18.4 - - - +
141A TYR* 1.3 80.4 - - - +
143A ALA* 1.3 57.3 + - - +
145A ARG* 3.8 32.6 + - - +
146A PHE* 3.6 20.4 - + - -
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Residues in contact with ALA 143 (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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127A PRO* 3.5 20.4 - - + -
128A ILE 3.7 14.8 - - - +
139A SER* 4.4 0.7 - - - -
140A ASN* 2.7 22.8 + - - +
142A HIS* 1.3 70.2 - - - +
144A ARG* 1.3 58.0 + - - +
145A ARG 2.9 5.6 - - - -
146A PHE* 2.9 23.6 + - - +
148A VAL* 3.3 26.0 - - + +
161A CYS* 5.5 0.4 - - - -
164A LEU* 3.9 11.4 - - + -
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Residues in contact with ARG 144 (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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110A ALA* 3.8 5.3 - - - +
138A THR* 3.3 5.5 + - - -
139A SER* 3.0 29.8 + - - +
140A ASN 2.7 10.8 + - - +
141A TYR* 2.9 42.7 + - + +
143A ALA* 1.3 75.9 - - - +
145A ARG* 1.3 59.0 + - - +
146A PHE 3.1 1.1 - - - -
147A GLY* 3.3 10.9 + - - -
148A VAL 3.3 19.7 + - - +
149A ARG* 3.7 44.8 + - + +
602A 0KX 2.7 60.7 + - - -
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Residues in contact with ARG 145 (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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36A ILE* 5.6 2.4 - - - +
141A TYR 3.0 17.2 + - - +
142A HIS* 3.8 39.9 + - - +
143A ALA 2.9 1.2 - - - -
144A ARG* 1.3 78.1 - - - +
146A PHE* 1.3 64.1 + - + +
147A GLY 3.3 1.6 - - - -
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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