Contacts of the helix formed by residues 219 - 224 (chain A) in PDB entry 2Q5E
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 SER 219 (chain A).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
1A MG 3.9 6.1 - - - -
217A ASP* 2.6 20.5 + - - +
218A ASN* 1.3 87.1 + - - +
220A PRO* 1.3 69.6 - - - +
221A ALA* 4.2 9.4 - - - -
222A SER* 2.9 30.9 + - - -
223A TYR* 3.6 8.2 - - - -
195H HIS* 6.0 1.4 - - - -
225H PHE* 5.9 1.4 - - - -
----------------------------------------------------------
Back to top of page
Residues in contact with PRO 220 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
218A ASN 3.6 9.2 - - - +
219A SER* 1.3 82.2 - - - +
221A ALA* 1.3 61.5 + - - +
223A TYR* 3.1 41.2 + - + +
224A ILE* 3.6 10.2 + - - +
232A PRO* 6.3 0.2 - - + -
134C THR* 4.4 6.5 + - - +
135C THR 3.4 24.0 + - - +
136C HIS* 3.8 33.0 - - + +
137C GLN 5.8 0.2 - - - +
194H PHE 5.7 3.1 - - - +
195H HIS* 6.4 1.8 - - + -
----------------------------------------------------------
Back to top of page
Residues in contact with ALA 221 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
198A CYS* 4.0 26.4 - - + +
199A TYR 4.2 2.7 - - - +
200A VAL* 3.6 10.2 - - - +
219A SER* 3.0 8.8 - - - -
220A PRO* 1.3 79.1 - - - +
222A SER* 1.3 60.9 + - - +
223A TYR 3.2 0.3 + - - -
224A ILE* 3.4 28.5 + - + +
134C THR* 4.6 8.1 + - + +
193H VAL* 6.5 0.9 - - + -
----------------------------------------------------------
Back to top of page
Residues in contact with SER 222 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
199A TYR 4.0 12.8 + - - -
200A VAL* 3.5 3.0 - - - +
201A LYS* 2.6 53.8 + - - +
215A ILE* 4.7 1.1 - - - -
217A ASP* 3.0 32.7 + - - -
219A SER* 2.9 18.2 + - - -
221A ALA* 1.3 77.3 - - - +
223A TYR* 1.3 59.2 + - - +
224A ILE 3.5 0.7 - - - -
----------------------------------------------------------
Back to top of page
Residues in contact with TYR 223 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
200A VAL* 4.9 0.2 - - - -
201A LYS 4.8 4.7 - - - +
203A LEU* 6.0 0.4 - - + -
215A ILE* 4.1 26.2 - - + -
217A ASP* 3.8 31.2 + - + -
219A SER 3.6 15.7 - - - -
220A PRO* 3.1 36.9 + - + +
221A ALA 3.1 0.8 - - - -
222A SER* 1.3 80.3 - - - +
224A ILE* 1.3 64.7 + - - +
225A PHE 3.0 4.8 + - - -
226A HIS* 3.0 18.2 + - + +
227A PRO* 3.3 21.7 - - + +
230A ALA* 3.5 31.6 - - + -
232A PRO* 3.6 27.0 - - + +
135C THR 4.5 4.7 + - - -
137C GLN* 5.6 0.7 - - - +
----------------------------------------------------------
Back to top of page
Residues in contact with ILE 224 (chain A).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
195A HIS* 4.0 19.5 - - + +
198A CYS* 4.6 7.4 - - - -
200A VAL* 3.9 18.4 - - + +
220A PRO 4.1 1.6 - - - +
221A ALA* 3.4 26.5 - - + +
222A SER 3.5 3.0 + - - -
223A TYR* 1.3 77.6 - - - +
225A PHE* 1.3 78.0 + - + +
227A PRO* 3.7 11.2 - - - +
133C GLY 3.9 18.6 - - - +
134C THR* 3.5 37.5 - - + +
135C THR* 5.7 2.3 + - - +
171F ASP* 4.2 11.7 - - - +
----------------------------------------------------------
Back to top of page
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
------------------------------------------------------------
Atomic class I II III IV V VI VII VIII
------------------------------------------------------------
I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
------------------------------------------------------------
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