Contacts of the helix formed by residues 273 - 278 (chain K) in PDB entry 6C23
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 GLN 273 (chain K).
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Specific contacts
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Residue Dist Surf HB Arom Phob DC
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272K VAL* 1.3 82.2 - - - +
274K ARG* 1.3 67.9 + - - +
275K GLU* 3.4 7.2 - - + +
276K GLN* 3.4 11.5 + - + +
277K SER* 3.3 17.7 + - - -
441K ARG* 3.5 23.0 - - - +
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Residues in contact with ARG 274 (chain K).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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273K GLN* 1.3 73.3 + - - +
275K GLU* 1.3 64.0 + - - +
277K SER* 2.5 27.4 + - - -
278K LEU* 3.4 5.4 + - - +
438K SER 4.7 1.8 - - - -
441K ARG* 3.5 17.4 - - + +
442K VAL* 3.4 48.3 - - + +
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Residues in contact with GLU 275 (chain K).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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273K GLN* 3.4 5.0 - - + +
274K ARG* 1.3 77.4 - - - +
276K GLN* 1.3 71.8 + - - +
278K LEU* 2.9 37.4 + - - +
279K HIS* 3.1 23.8 + - - -
282K HIS* 5.6 2.3 - - - +
303K PRO* 4.7 16.1 - - + +
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Residues in contact with GLN 276 (chain K).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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259K GLU* 3.5 40.7 - - - +
261K THR* 3.5 30.5 + - + +
272K VAL* 4.2 12.1 - - + -
273K GLN* 3.4 16.5 + - + +
274K ARG 3.2 0.6 - - - -
275K GLU* 1.3 90.8 + - - +
277K SER* 1.3 59.2 + - - +
278K LEU 3.4 0.9 + - - -
279K HIS* 3.4 23.4 + - - +
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Residues in contact with SER 277 (chain K).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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261K THR* 4.4 11.8 + - - +
264K ILE* 5.3 3.4 - - - -
272K VAL* 5.3 1.5 - - - +
273K GLN 3.3 7.9 + - - -
274K ARG* 2.5 26.7 + - - -
276K GLN* 1.3 76.8 - - - +
278K LEU* 1.3 66.1 + - - +
279K HIS 3.6 0.9 - - - -
438K SER* 4.4 18.7 + - - -
442K VAL* 4.2 13.6 - - - +
610M GLU* 4.9 6.4 - - - +
658M LEU* 3.5 27.4 - - - +
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Residues in contact with LEU 278 (chain K).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
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274K ARG 3.4 8.6 + - - +
275K GLU* 2.9 16.8 + - - +
277K SER* 1.3 81.3 - - - +
279K HIS* 1.3 59.2 + - - +
280K SER 3.6 0.9 - - - +
281K PHE* 4.2 9.4 - - + +
282K HIS* 3.1 29.7 - - + +
442K VAL* 4.1 22.0 - - + -
610M GLU* 6.0 0.2 - - - -
658M LEU* 3.2 46.2 - - + +
661M VAL* 4.3 15.9 - - + -
662M SER* 4.3 10.8 - - - +
665M ASP* 3.9 23.6 - - - +
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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