Contacts of the helix formed by residues 40 - 46 (chain I) in PDB entry 1IBM
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 LEU 40 (chain I).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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1290A G 3.7 22.4 - - - +
1291A G 4.2 4.3 - - - +
37G ASN* 3.5 20.6 - - + +
36I TYR 5.2 0.2 - - - +
37I PHE* 3.8 31.3 + - + +
38I GLN 3.9 6.5 - - - +
39I GLY* 1.3 79.1 - - - +
41I VAL* 1.3 73.1 + - - +
42I ARG* 3.5 3.1 - - + -
43I ALA* 3.0 17.1 + - + +
70I LYS* 3.9 36.1 - - + -
74I ILE* 4.7 8.7 - - + -
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Residues in contact with VAL 41 (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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16G LEU* 4.2 25.6 - - + -
17G VAL* 5.7 1.8 - - + -
36G LYS* 6.3 0.4 - - - +
37G ASN* 3.5 23.4 + - - +
40G ALA* 3.6 24.9 - - + -
41G ARG* 4.8 9.6 - - + +
44G TYR* 4.6 17.0 - - + -
39I GLY 4.0 1.2 - - - -
40I LEU* 1.3 76.8 - - - +
42I ARG* 1.3 70.1 + - + +
43I ALA* 2.6 2.8 + - - +
44I VAL* 3.4 19.3 + - + +
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Residues in contact with ARG 42 (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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1373A G 4.5 8.3 + - - +
16G LEU* 4.2 15.9 - - + +
36G LYS* 3.9 33.7 - - + +
37G ASN* 4.7 4.4 - - - +
10I ARG* 6.0 0.4 - - - +
40I LEU* 3.1 3.5 + - + +
41I VAL* 1.3 82.6 - - + +
43I ALA* 1.3 67.1 + - - +
44I VAL* 2.6 2.6 + - - +
45I ALA* 2.5 38.0 + - - +
71I SER* 3.3 41.4 + - - -
74I ILE* 4.1 21.1 - - + +
75I ASP* 3.4 28.9 + - - +
78I LYS* 6.1 1.2 - - - +
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Residues in contact with ALA 43 (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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33I PHE* 4.0 8.8 - - + -
37I PHE* 3.9 33.7 - - + +
40I LEU 3.0 17.6 + - - +
41I VAL 2.6 3.9 + - - +
42I ARG* 1.3 71.2 - - - +
44I VAL* 1.3 68.7 + - + +
45I ALA 2.6 2.6 + - - -
46I ALA* 2.8 23.2 + - - +
74I ILE* 3.7 19.4 - - + +
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Residues in contact with VAL 44 (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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16G LEU* 5.0 22.9 - - + +
33I PHE* 4.9 7.5 - - - -
41I VAL* 3.9 11.4 - - + +
42I ARG 2.6 5.1 + - - +
43I ALA* 1.3 75.7 - - + +
45I ALA* 1.3 67.2 + - - +
46I ALA 3.1 0.9 + - - -
47I LEU* 3.2 6.1 + - - +
48I GLU* 5.3 3.4 - - - +
51I ARG* 2.7 48.3 + - - +
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Residues in contact with ALA 45 (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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16G LEU* 4.3 16.0 - - + +
42I ARG* 2.5 40.6 + - - +
43I ALA 2.6 0.6 + - - +
44I VAL* 1.3 71.9 - - - +
46I ALA* 1.3 53.0 + - - +
48I GLU* 2.5 49.4 + - - +
51I ARG* 4.7 0.2 - - - +
74I ILE* 4.6 5.2 - - + +
78I LYS* 4.1 12.8 - - - +
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Residues in contact with ALA 46 (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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33I PHE* 3.9 17.0 - - + -
43I ALA 2.8 16.3 + - - +
45I ALA* 1.3 73.6 - - - +
47I LEU* 1.3 58.2 + - + +
49I PRO* 2.8 21.5 - - - +
74I ILE* 3.4 21.0 + - + +
77I ILE* 3.6 20.4 - - + -
78I LYS* 3.1 26.1 - - - +
81I ILE* 3.6 4.4 - - - +
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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