Contacts of the helix formed by residues 142 - 146 (chain A) in PDB entry 2HU4
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 142 (chain A).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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139A LEU* 3.5 19.2 + - + +
140A LEU 3.2 1.7 - - - +
141A ASN* 1.3 79.3 - - - +
143A LYS* 1.3 68.4 + - - +
144A HIS* 3.0 37.0 + - - +
145A SER* 3.0 18.7 + - - -
437A ILE* 5.0 0.9 - - - +
468A ILE 4.0 9.2 - - - +
107D ARG 3.7 4.4 - - - +
108D ILE 5.7 0.2 - - - -
110D SER* 2.7 36.1 + - - +
111D LYS* 3.8 20.8 + - + +
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Residues in contact with LYS 143 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
142A ASP* 1.3 78.3 + - - +
144A HIS* 1.3 79.7 + - + +
145A SER 2.9 6.1 + - - -
146A ASN* 3.0 21.5 + - - +
437A ILE* 4.7 7.5 - - - +
468A ILE 5.2 2.0 - - - -
110D SER* 4.2 7.6 - - - +
463D GLU* 2.7 62.4 + - + +
464D LEU 4.8 0.2 - - - -
465D PRO 2.9 19.4 + - - -
466D PHE* 4.0 10.5 - - - +
467D THR 6.0 0.2 - - - +
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Residues in contact with HIS 144 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
138A ALA* 3.3 25.5 - - + +
142A ASP* 3.0 25.0 + - - +
143A LYS* 1.3 81.1 - - + +
145A SER* 1.3 57.2 + - - +
146A ASN* 3.1 5.3 + - - +
148A THR* 4.2 4.3 - - - +
107D ARG* 3.3 32.8 + - + +
110D SER* 3.3 16.8 - - - -
461D GLY 4.1 5.9 + - - -
462D ALA* 3.5 13.8 - - + -
463D GLU* 3.0 48.1 + - + +
466D PHE* 3.5 23.4 - - - -
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Residues in contact with SER 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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116A VAL* 4.6 9.1 - - - +
138A ALA* 4.1 4.0 - - - +
139A LEU 3.4 19.9 + - - -
140A LEU* 4.6 4.5 - - - +
141A ASN 4.7 2.6 + - - -
142A ASP 3.0 18.1 + - - -
143A LYS 2.9 1.2 + - - -
144A HIS* 1.3 78.3 - - - +
146A ASN* 1.3 70.7 - - - +
148A THR* 2.9 20.5 + - - +
437A ILE* 4.7 2.5 - - - -
438A TRP* 3.1 29.0 - - - +
468A ILE 5.5 0.9 - - - -
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Residues in contact with ASN 146 (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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143A LYS 3.0 14.4 + - - +
144A HIS 3.1 4.1 + - - -
145A SER* 1.3 89.5 - - - +
147A GLY* 1.3 54.9 + - - +
148A THR* 2.3 20.0 + - - -
430A ARG* 5.2 0.6 - - - +
437A ILE* 2.4 57.0 + - - +
463D GLU* 5.1 7.2 - - - +
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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