Contacts of the helix formed by residues 302 - 310 (chain B) in PDB entry 1XAI
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 302 (chain B).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
251B TYR* 3.1 22.1 + - + +
300B ASP 4.5 0.9 - - - +
301B LEU* 1.3 81.3 - - - +
303B PHE* 1.3 66.3 + - - +
304B GLU* 3.3 17.6 + - - +
305B THR* 2.8 21.0 + - - -
306B LEU* 3.0 30.8 + - - +
350B LYS* 5.1 2.0 - - - +
----------------------------------------------------------
Back to top of page
Residues in contact with PHE 303 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
244B PHE* 5.8 2.2 - + - -
266B TYR* 5.7 0.7 - - - -
302B ASP* 1.3 73.0 + - - +
304B GLU* 1.3 60.6 + - - +
306B LEU* 3.3 4.9 + - + -
307B TYR* 2.7 77.0 + + + +
310B MET* 4.9 4.7 - - - -
339B GLN* 3.6 8.3 - - + -
342B LEU* 3.2 49.1 - - + -
343B GLN* 2.8 44.2 - - + +
346B CYS* 3.9 24.9 - - + -
347B GLU* 6.3 1.1 - - + -
350B LYS* 5.8 0.2 - - - +
----------------------------------------------------------
Back to top of page
Residues in contact with GLU 304 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
302B ASP* 3.3 13.4 + - - +
303B PHE* 1.3 85.8 - - - +
305B THR* 1.3 64.1 + - - +
307B TYR* 3.3 14.6 + - - +
308B GLN* 3.3 26.9 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with THR 305 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
251B TYR* 3.3 29.9 + - + -
302B ASP* 2.8 26.5 + - - -
303B PHE 3.5 0.2 - - - -
304B GLU* 1.3 74.1 - - - +
306B LEU* 1.3 67.3 + - - +
308B GLN* 3.2 9.3 + - + +
309B TYR* 3.2 19.8 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with LEU 306 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
244B PHE* 3.5 34.5 - - + -
247B ALA* 3.1 36.7 - - + +
248B VAL* 3.9 5.8 - - + +
251B TYR* 3.1 33.0 - - + -
301B LEU* 4.3 11.0 - - + -
302B ASP 3.0 37.2 + - - +
303B PHE* 3.6 4.7 - - + +
305B THR* 1.3 76.2 - - - +
307B TYR* 1.3 52.5 + - - +
309B TYR* 3.0 9.4 + - - +
310B MET* 2.7 39.4 + - - +
346B CYS* 4.6 0.4 - - - -
----------------------------------------------------------
Back to top of page
Residues in contact with TYR 307 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
303B PHE* 2.7 50.3 + + + +
304B GLU* 3.4 16.2 - - - +
306B LEU* 1.3 71.2 - - - +
308B GLN* 1.3 62.2 + - + +
310B MET* 2.6 41.4 + - + +
311B LEU* 3.2 34.8 + - + +
321B VAL* 4.0 14.1 - - + +
339B GLN* 3.1 62.5 + - + +
342B LEU* 4.9 2.2 - - + -
----------------------------------------------------------
Back to top of page
Residues in contact with GLN 308 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
87A HIS* 2.9 46.7 + - + +
304B GLU* 3.3 14.8 + - - +
305B THR* 3.2 11.5 + - + +
307B TYR* 1.3 84.4 - - + +
309B TYR* 1.3 61.5 + - - +
311B LEU* 3.2 40.4 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with TYR 309 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
87A HIS* 5.6 0.2 - - - -
143B GLN 3.5 12.8 - - - -
144B GLY* 3.4 14.1 - - - -
145B LYS* 2.7 32.6 + - - +
243B THR 5.5 0.7 - - - -
246B HIS* 3.5 33.8 + - + +
247B ALA* 3.8 19.1 - - + +
250B TYR* 3.2 39.7 - + + +
251B TYR* 5.3 3.4 - - + -
305B THR 3.2 10.9 + - - +
306B LEU* 3.0 13.3 + - - +
308B GLN* 1.3 71.2 - - - +
310B MET* 1.3 57.7 + - - +
311B LEU 2.9 4.5 - - - -
312B SER* 2.8 35.0 + - - -
313B ASP* 3.8 6.2 + - + -
----------------------------------------------------------
Back to top of page
Residues in contact with MET 310 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
243B THR* 3.6 32.1 - - + +
244B PHE* 4.0 35.7 - - + -
247B ALA* 3.9 13.5 - - + -
266B TYR* 4.5 8.5 - - + +
303B PHE* 4.9 4.7 - - - -
306B LEU* 2.7 27.2 + - - +
307B TYR* 2.6 28.1 + - - +
309B TYR* 1.3 71.9 - - - +
311B LEU* 1.3 61.9 + - + +
312B SER 3.3 0.4 - - - -
313B ASP* 3.5 11.9 - - - +
316B ASN* 2.9 18.7 + - - +
321B VAL* 4.1 13.6 - - + +
342B LEU* 4.3 24.0 - - + -
----------------------------------------------------------
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