Contacts of the helix formed by residues 249 - 256 (chain A) in PDB entry 2QD4
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 PRO 249 (chain A).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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247A HIS 4.4 2.0 - - - +
248A PHE* 1.3 90.0 - - + +
250A LEU* 1.3 66.5 + - - +
251A GLU* 3.6 25.4 - - - +
252A LYS* 2.9 24.2 + - + -
253A ARG* 3.3 8.3 + - - -
364A ASN* 3.7 38.6 - - - +
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Residues in contact with LEU 250 (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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248A PHE 3.1 5.6 + - - -
249A PRO* 1.3 71.2 - - - +
251A GLU* 1.3 66.9 + - - +
252A LYS 3.1 1.8 + - - -
253A ARG* 3.4 26.9 + - + +
254A SER 5.0 0.3 + - - -
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Residues in contact with GLU 251 (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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249A PRO* 3.6 18.8 - - - +
250A LEU* 1.3 83.5 + - - +
252A LYS* 1.3 80.3 + - + +
253A ARG 3.7 0.2 - - - -
254A SER 5.5 0.4 - - - -
255A GLU* 5.4 1.4 - - - +
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Residues in contact with LYS 252 (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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248A PHE* 5.2 0.4 - - + -
249A PRO* 2.9 18.6 + - + +
251A GLU* 1.3 102.2 + - + +
253A ARG* 1.3 65.7 + - - +
254A SER 3.3 2.9 - - - -
255A GLU* 3.0 26.8 + - + +
256A VAL* 3.1 14.9 + - + +
329A ASN* 3.2 33.2 - - - +
363A GLU* 3.0 28.4 + - + +
364A ASN* 4.0 8.5 - - - +
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Residues in contact with ARG 253 (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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242A LEU* 3.9 19.8 + - - +
245A LEU* 3.7 55.4 + - + +
246A ASP* 2.7 30.1 + - - +
248A PHE* 4.8 2.2 - - - -
249A PRO 3.3 8.5 + - - +
250A LEU* 3.4 26.7 + - + +
251A GLU 3.7 0.2 - - - -
252A LYS* 1.3 77.4 - - - +
254A SER* 1.3 62.0 + - - +
256A VAL* 3.3 16.7 + - - +
294A CYS* 5.7 2.2 - - - +
295A ASN* 2.9 23.4 + - - +
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Residues in contact with SER 254 (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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250A LEU 5.0 0.4 + - - -
251A GLU 5.5 0.6 + - - -
252A LYS 3.3 0.2 - - - -
253A ARG* 1.3 82.6 - - - +
255A GLU* 1.3 60.7 + - - +
256A VAL 3.3 0.7 - - - +
294A CYS 5.2 3.8 - - - +
295A ASN* 3.6 12.4 + - - +
296A PRO* 4.8 6.9 - - - +
327A ARG* 5.4 1.0 + - - -
897B LYS* 5.2 9.3 + - - +
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Residues in contact with GLU 255 (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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251A GLU 5.4 1.3 - - - +
252A LYS* 3.0 22.2 + - + +
254A SER* 1.3 77.4 - - - +
256A VAL* 1.3 65.3 + - - +
257A VAL* 3.4 3.8 + - - +
326A GLY 4.0 5.3 - - - +
327A ARG* 2.7 57.9 + - - +
328A LYS 4.6 1.3 + - - +
329A ASN* 4.1 22.5 + - + +
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Residues in contact with VAL 256 (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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245A LEU* 3.6 21.8 - - + -
248A PHE* 3.5 40.2 - - + -
252A LYS 3.1 15.3 + - - +
253A ARG* 3.3 16.2 + - - +
255A GLU* 1.3 79.0 - - - +
257A VAL* 1.3 64.5 + - - +
258A ILE* 4.7 2.7 - - + +
295A ASN* 2.8 28.9 + - - +
296A PRO* 3.7 6.2 - - - +
329A ASN* 3.3 11.9 - - + +
331A LEU* 3.8 24.0 - - + +
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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