Contacts of the helix formed by residues 76 - 88 (chain A) in PDB entry 1ECD
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 ILE 76 (chain A).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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69A ILE* 3.9 31.0 - - + +
72A GLU* 3.9 11.9 - - + +
73A LEU* 3.9 16.6 - - + -
74A PRO* 3.0 20.5 + - + +
75A ASN* 1.3 76.2 - - - +
77A GLU* 1.3 65.9 + - - +
78A ALA* 3.4 2.9 - - - -
79A ASP* 3.2 7.2 + - - +
80A VAL* 3.1 24.2 + - + +
127A THR* 4.5 8.7 - - + -
128A PHE* 4.1 37.0 - - + +
131A MET* 3.2 34.1 - - + -
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Residues in contact with GLU 77 (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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75A ASN* 3.7 6.6 - - - +
76A ILE* 1.3 79.9 - - - +
78A ALA* 1.3 58.5 + - - +
80A VAL* 3.3 2.9 + - - +
81A ASN* 2.9 38.1 + - - +
131A MET* 3.7 22.1 - - - +
135A LYS* 3.0 28.8 + - - +
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Residues in contact with ALA 78 (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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75A ASN* 5.4 4.9 + - - +
76A ILE 3.4 0.8 - - - -
77A GLU* 1.3 79.0 - - - +
79A ASP* 1.3 62.8 + - - +
81A ASN* 3.3 13.0 - - - +
82A THR* 3.1 28.9 + - - -
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Residues in contact with ASP 79 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
65A PHE* 3.6 27.0 - - + -
68A LYS* 2.8 36.8 + - - +
69A ILE* 4.1 12.5 - - + +
72A GLU* 2.4 28.9 - - - +
76A ILE 3.2 8.6 + - - +
77A GLU 3.2 0.4 - - - -
78A ALA* 1.3 82.9 - - - +
80A VAL* 1.3 60.3 + - - +
82A THR* 3.4 6.5 + - - -
83A PHE* 2.9 27.2 + - - +
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Residues in contact with VAL 80 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
69A ILE* 5.3 1.1 - - + -
76A ILE* 3.1 29.9 + - + +
77A GLU 3.6 6.5 - - - +
79A ASP* 1.3 74.4 - - + +
81A ASN* 1.3 59.9 + - - +
83A PHE* 3.3 7.8 + - - +
84A VAL* 2.9 36.1 + - + +
128A PHE* 4.2 22.0 - - + -
131A MET* 4.0 17.0 - - + -
132A ILE* 4.0 28.3 - - + +
135A LYS* 3.8 27.6 - - + -
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Residues in contact with ASN 81 (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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77A GLU* 2.9 26.6 + - - +
78A ALA* 3.3 15.9 - - - +
80A VAL* 1.3 76.5 - - - +
82A THR* 1.3 57.6 + - - +
84A VAL* 3.3 8.0 + - - +
85A ALA* 3.0 28.5 + - - +
135A LYS* 2.9 32.0 + - - +
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Residues in contact with THR 82 (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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65A PHE* 4.4 16.4 - - + -
78A ALA 3.1 14.6 + - - -
79A ASP* 3.5 13.0 + - - -
81A ASN* 1.3 74.5 - - - +
83A PHE* 1.3 65.1 + - - +
85A ALA* 3.3 8.5 + - + +
86A SER* 3.2 24.0 + - - +
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Residues in contact with PHE 83 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
65A PHE* 4.4 11.2 - + + -
79A ASP 2.9 15.1 + - - +
80A VAL* 3.4 12.6 - - - +
82A THR* 1.3 77.7 - - - +
84A VAL* 1.3 66.5 + - + +
86A SER* 3.0 7.6 + - - -
87A HIS* 2.9 65.4 + + + +
92A VAL* 5.4 1.1 - - + -
97A LEU* 4.3 12.3 - - + -
128A PHE* 5.9 3.8 - + + -
132A ILE* 4.0 28.9 - - + -
136A MET* 4.2 18.4 - - - -
137A HEM 3.4 58.3 - + + -
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Residues in contact with VAL 84 (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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80A VAL* 2.9 26.8 + - + +
81A ASN* 3.7 6.1 - - - +
83A PHE* 1.3 84.1 - - + +
85A ALA* 1.3 60.0 + - - +
88A LYS* 2.8 46.8 + - + +
132A ILE* 4.8 3.6 - - + +
135A LYS* 4.0 44.2 - - + +
136A MET* 4.0 28.5 - - + -
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Residues in contact with ALA 85 (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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81A ASN 3.0 12.7 + - - +
82A THR* 3.4 14.1 - - - +
84A VAL* 1.3 79.9 - - - +
86A SER* 1.3 57.8 + - - +
88A LYS* 5.3 0.2 - - - -
89A PRO* 3.4 22.1 - - - +
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Residues in contact with SER 86 (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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82A THR* 3.2 10.9 + - - +
83A PHE* 3.0 7.4 + - - -
85A ALA* 1.3 80.0 - - - +
87A HIS* 1.3 87.1 + - - +
89A PRO* 4.1 6.4 - - - +
90A ARG* 3.5 27.8 + - - +
137A HEM 3.9 15.3 + - - -
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Residues in contact with HIS 87 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
83A PHE* 2.9 48.1 + + + +
86A SER* 1.3 102.0 + - - +
88A LYS* 1.3 65.8 + - - +
89A PRO 3.3 2.0 - - - -
90A ARG* 3.2 35.9 + - - +
91A GLY 3.6 6.1 + - - -
92A VAL* 3.6 20.1 + - + +
136A MET* 4.3 4.7 - - + -
137A HEM 2.2 75.8 + + + -
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Residues in contact with LYS 88 (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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84A VAL* 2.8 37.4 + - + +
85A ALA* 5.3 0.4 - - - -
87A HIS* 1.3 71.7 - - - +
89A PRO* 1.3 65.1 - - + +
91A GLY* 3.2 17.7 + - - -
92A VAL 5.4 0.4 - - - +
135A LYS 4.5 6.7 + - - +
136A MET* 4.1 28.1 - - + +
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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