Contacts of the helix formed by residues 646 - 653 (chain A) in PDB entry 2XOY
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 LYS 646 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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643A THR* 3.1 19.1 + - + +
644A GLN 4.5 0.9 - - - -
645A VAL* 1.3 89.6 - - + +
647A ALA* 1.3 67.1 + - - +
648A HIS* 3.3 2.9 - - + +
649A HIS* 3.1 8.7 + - + +
650A ALA* 3.1 19.8 + - - +
554B SER* 4.0 17.8 + - - -
558B ASP* 2.9 39.1 + - - +
561B LYS* 4.9 5.5 - - - +
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Residues in contact with ALA 647 (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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555A TYR* 5.7 0.5 - - - +
645A VAL 4.0 2.0 + - - -
646A LYS* 1.3 72.9 - - - +
648A HIS* 1.3 65.3 + - - +
650A ALA* 3.3 6.4 + - - +
651A MET* 3.1 31.8 + - + +
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Residues in contact with HIS 648 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
646A LYS* 3.3 2.4 - - + +
647A ALA* 1.3 79.4 - - - +
649A HIS* 1.3 60.0 + - + +
651A MET* 3.4 12.2 + - - +
652A LYS* 3.1 48.2 + - + +
651B MET* 5.4 8.5 - - - -
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Residues in contact with HIS 649 (chain A).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
635A CYS* 4.1 5.6 - - - -
637A TRP* 5.7 2.0 - + - -
641A CYS* 3.5 1.8 - - - -
643A THR* 3.5 50.5 - - + +
644A GLN* 3.6 0.7 - - - -
646A LYS* 3.1 6.8 + - + +
648A HIS* 1.3 78.3 - - + +
650A ALA* 1.3 65.3 + - - +
651A MET 3.1 1.6 - - - -
652A LYS* 3.2 4.2 + - - +
653A PHE* 3.1 53.4 + + - -
655A HIS* 3.2 10.2 + + - -
995A ZN 2.0 37.5 - - - -
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Residues in contact with ALA 650 (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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553A ASN* 3.7 21.1 - - - +
554A SER* 6.1 0.2 - - - +
555A TYR* 3.6 12.7 - - + -
556A GLU* 4.3 2.4 - - - +
632A ARG* 3.4 9.7 + - - -
644A GLN 3.3 24.0 + - - +
646A LYS 3.1 8.4 + - - +
647A ALA* 3.7 10.1 - - - +
649A HIS* 1.3 77.2 - - - +
651A MET* 1.3 57.8 + - - +
653A PHE 3.0 20.4 - - - +
655A HIS* 4.2 10.0 + - - -
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Residues in contact with MET 651 (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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555A TYR* 3.7 41.5 + - + +
632A ARG* 2.9 26.0 + - - +
647A ALA* 3.1 23.9 + - + +
648A HIS* 3.6 9.0 - - - +
650A ALA* 1.3 77.5 - - - +
652A LYS* 1.3 60.8 + - + +
653A PHE 3.5 0.2 - - - -
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Residues in contact with LYS 652 (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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632A ARG* 3.6 7.8 - - - +
633A PRO* 3.3 24.0 - - + +
648A HIS* 3.1 34.8 + - + +
649A HIS* 3.2 5.5 + - - +
651A MET* 1.3 81.0 - - + +
653A PHE* 1.3 89.6 + - + +
651B MET* 4.2 24.4 - - - +
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Residues in contact with PHE 653 (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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632A ARG* 3.0 18.6 + - - -
633A PRO* 3.3 28.7 - - + +
634A ASP 3.9 13.5 - - - -
635A CYS* 3.9 14.6 - - + -
636A TYR 5.9 0.4 - - - -
649A HIS* 3.1 42.5 + + - -
650A ALA 3.0 8.8 - - - +
652A LYS* 1.3 114.3 - - + +
654A ASN* 1.3 60.3 + - - +
655A HIS* 3.3 22.1 + - + -
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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