Contacts of the helix formed by residues 82 - 111 (chain 5) in PDB entry 2X17
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 82 (chain 5).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
305 TYR* 3.3 8.4 + - - -
805 TRP* 3.3 1.4 - - - +
815 GLU* 1.3 79.8 - - - +
835 PRO* 1.4 69.8 - - - +
845 LEU* 3.6 12.6 + - - +
855 LYS* 3.2 27.2 + - - +
865 ALA* 3.0 27.9 + - - +
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Residues in contact with PRO 83 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
305 TYR* 3.8 7.4 - - + +
315 PHE* 3.8 21.1 - - + -
345 LEU* 4.2 10.8 - - + -
365 LEU* 4.2 21.3 - - + -
395 PHE* 5.3 0.7 - - + -
825 SER* 1.4 87.2 - - - +
845 LEU* 1.3 59.9 + - - +
865 ALA* 3.6 4.5 + - + +
875 PHE* 3.4 19.4 + - - -
1415 LEU* 3.4 28.4 - - + +
1515 LEU* 4.3 19.5 - - + -
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Residues in contact with LEU 84 (chain 5).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
825 SER* 3.1 10.2 + - - +
835 PRO* 1.3 77.3 - - - +
855 LYS* 1.3 64.0 + - + +
875 PHE* 3.3 4.7 + - - +
885 GLU* 3.0 47.1 + - - +
1385 LEU* 3.9 9.8 - - + +
1415 LEU* 3.8 24.8 - - + +
1425 LYS* 3.7 43.7 - - + +
1455 LYS* 5.3 13.5 - - + -
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Residues in contact with LYS 85 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
805 TRP* 3.9 7.2 - - + -
815 GLU* 4.1 32.8 - - + +
825 SER* 3.2 26.2 + - - +
845 LEU* 1.3 80.7 - - + +
865 ALA* 1.3 58.8 + - - +
885 GLU* 3.4 28.2 + - + +
895 ALA* 3.1 27.7 + - - +
----------------------------------------------------------
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Residues in contact with ALA 86 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
275 MET* 3.4 20.5 - - + +
305 TYR* 4.0 10.5 - - + -
315 PHE* 4.0 21.3 - - + -
805 TRP* 3.8 27.1 - - + +
825 SER 3.0 15.1 + - - +
835 PRO 3.6 6.5 - - - +
845 LEU 3.2 0.2 - - - -
855 LYS* 1.3 77.8 - - - +
875 PHE* 1.3 58.4 + - - +
895 ALA* 3.5 0.9 + - - +
905 ALA 3.2 18.2 + - - -
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Residues in contact with PHE 87 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
315 PHE* 3.9 9.9 - + - -
395 PHE* 3.8 28.0 - + - -
425 TRP* 4.3 13.5 - + - -
435 MET* 3.7 29.4 - - + -
835 PRO 3.4 6.5 + - - -
845 LEU 3.3 4.9 + - - +
865 ALA* 1.3 76.7 - - - +
885 GLU* 1.3 59.9 + - - +
895 ALA 3.2 0.4 - - - -
905 ALA* 3.7 4.8 - - + +
915 TYR* 3.0 29.1 + - - +
1345 VAL* 3.7 35.9 - - + +
1375 ILE* 3.7 38.4 - - + -
1385 LEU* 3.4 12.7 - - - +
1415 LEU* 3.6 29.6 - - + -
1585 LEU* 4.8 1.3 - - + -
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Residues in contact with GLU 88 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
845 LEU* 3.0 36.5 + - + +
855 LYS* 3.4 41.0 + - + +
875 PHE* 1.3 77.0 - - - +
895 ALA* 1.3 57.6 + - - +
915 TYR* 3.8 2.4 + - - +
925 GLU* 3.2 27.3 + - - +
1385 LEU* 3.8 23.6 - - + -
1425 LYS* 4.3 12.5 - - - -
----------------------------------------------------------
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Residues in contact with ALA 89 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
235 LEU* 5.3 0.9 - - - +
275 MET* 4.1 6.9 - - + +
805 TRP* 3.4 29.8 - - + +
855 LYS 3.1 13.2 + - - +
865 ALA 3.6 4.5 - - - +
875 PHE 3.2 0.2 - - - -
885 GLU* 1.3 75.7 - - - +
905 ALA* 1.3 57.9 - - - +
925 GLU* 3.5 11.7 + - - +
935 HIS* 3.0 26.7 + - - +
----------------------------------------------------------
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Residues in contact with ALA 90 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
245 TYR* 3.8 16.4 + - + +
275 MET* 3.7 22.2 - - + +
435 MET* 4.6 5.8 - - + -
865 ALA 3.2 16.2 + - - +
875 PHE* 3.4 8.9 + - - +
885 GLU 3.4 0.4 - - - -
895 ALA* 1.3 75.2 - - - +
915 TYR* 1.3 59.5 + - - +
935 HIS* 3.3 7.6 + - - +
945 GLU* 2.9 31.4 + - - +
1345 VAL* 4.1 14.1 - - + -
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Residues in contact with TYR 91 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
11 MET* 4.2 20.7 + - + +
651 ASN* 4.7 6.1 - - - +
875 PHE 3.0 17.7 + - - +
885 GLU 4.1 3.1 - - - +
905 ALA* 1.3 73.2 - - - +
925 GLU* 1.3 64.6 + - - +
945 GLU* 3.4 2.5 + - + +
955 LYS* 3.2 49.7 + - - +
1315 GLU* 3.6 50.0 + - + -
1345 VAL* 3.8 10.2 - - + +
1355 LYS* 3.5 40.7 - - + +
1385 LEU* 3.6 22.0 - - + -
----------------------------------------------------------
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Residues in contact with GLU 92 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
885 GLU 3.2 17.0 + - - +
895 ALA* 3.7 10.9 - - - +
905 ALA 3.3 0.2 - - - -
915 TYR* 1.3 77.9 - - - +
935 HIS* 1.3 56.9 + - - +
955 LYS* 3.5 17.6 + - + +
965 PHE* 3.1 24.4 + - - +
----------------------------------------------------------
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Residues in contact with HIS 93 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
165 ARG 5.0 0.2 - - - -
195 TYR* 3.9 24.4 - + - -
205 SER* 2.8 32.0 + - - -
235 LEU* 3.5 32.3 - - + +
245 TYR* 3.8 20.2 - + - -
895 ALA 3.0 17.3 + - - +
905 ALA* 3.5 6.1 - - - +
915 TYR 3.2 0.2 - - - -
925 GLU* 1.3 75.8 - - - +
945 GLU* 1.3 59.2 + - - +
965 PHE* 3.1 21.3 + + - +
975 ILE* 2.9 44.5 + - + +
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Residues in contact with GLU 94 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
205 SER* 5.6 0.2 + - - -
245 TYR* 2.5 27.9 + - - +
505 GLU* 4.1 2.8 - - - +
905 ALA 2.9 20.3 + - - +
915 TYR* 3.7 8.5 - - - +
925 GLU 3.4 0.4 - - - -
935 HIS* 1.3 79.3 - - - +
955 LYS* 1.3 56.5 + - - +
975 ILE* 3.6 5.3 + - - +
985 SER* 2.9 31.7 + - - -
1275 GLN* 3.0 26.4 + - - +
1305 GLU* 2.9 41.2 - - - +
1315 GLU* 3.6 17.1 + - + +
1345 VAL* 4.2 18.4 - - + -
----------------------------------------------------------
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Residues in contact with LYS 95 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
11 MET* 5.0 16.0 - - + +
915 TYR* 3.2 49.1 + - + +
925 GLU* 3.7 16.4 - - - +
935 HIS 3.2 0.2 - - - -
945 GLU* 1.3 74.6 - - - +
965 PHE* 1.3 60.2 + - - +
985 SER* 3.8 1.3 - - - -
995 LYS* 3.0 29.5 + - - +
1315 GLU* 4.0 24.7 - - - +
----------------------------------------------------------
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Residues in contact with PHE 96 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
165 ARG* 4.1 34.1 - - + -
195 TYR* 5.9 3.6 - + - -
925 GLU 3.1 14.2 + - - +
935 HIS* 3.1 26.7 + + - +
955 LYS* 1.3 74.9 - - - +
975 ILE* 1.3 77.4 + - + +
995 LYS* 3.5 8.4 + - + +
1005 SER* 3.2 23.6 + - - -
----------------------------------------------------------
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Residues in contact with ILE 97 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
135 GLN* 3.9 6.3 - - - +
165 ARG* 4.1 25.1 - - + +
175 GLU* 3.9 19.7 - - - +
205 SER* 3.4 27.4 - - - +
505 GLU* 5.6 1.3 - - - +
935 HIS* 2.9 32.5 + - + +
945 GLU* 4.0 5.2 - - - +
965 PHE* 1.3 85.3 - - + +
985 SER* 1.3 64.2 + - - +
1005 SER* 2.7 19.0 + - - +
1015 ILE* 3.0 19.0 + - + +
1275 GLN* 3.5 31.6 - - - +
----------------------------------------------------------
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Residues in contact with SER 98 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
945 GLU 2.9 15.2 + - - -
955 LYS* 3.8 5.2 - - - -
965 PHE 3.4 0.2 - - - -
975 ILE* 1.3 78.0 - - - +
995 LYS* 1.3 55.3 + - - +
1015 ILE* 3.2 9.3 + - - +
1025 TYR* 3.0 52.0 + - - -
1275 GLN* 3.0 27.4 + - - +
1315 GLU* 2.7 28.1 + - - -
----------------------------------------------------------
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Residues in contact with LYS 99 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
955 LYS 3.0 18.2 + - - +
965 PHE* 3.7 9.9 - - + +
975 ILE 3.3 0.2 - - - -
985 SER* 1.3 76.7 - - - +
1005 SER* 1.3 57.9 + - - +
1025 TYR* 3.2 17.3 + - + +
1035 GLU* 3.0 47.0 + - + +
----------------------------------------------------------
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Residues in contact with SER 100 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
135 GLN* 3.0 23.2 + - - +
165 ARG* 3.9 25.4 + - - -
965 PHE* 3.2 17.5 + - - -
975 ILE* 2.7 24.8 + - - -
995 LYS* 1.3 73.8 - - - +
1015 ILE* 1.3 62.5 + - - +
1035 GLU* 3.8 13.3 + - - +
1045 LEU* 3.3 26.2 + - - +
----------------------------------------------------------
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Residues in contact with ILE 101 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
135 GLN* 3.7 34.3 - - + +
175 GLU* 4.5 3.8 - - - +
575 PHE* 4.1 13.9 - - + -
975 ILE* 3.0 24.3 + - + +
985 SER* 3.4 11.2 - - - +
1005 SER* 1.3 76.2 - - - +
1025 TYR* 1.3 62.0 + - + +
1045 LEU* 3.3 5.9 + - - +
1055 ALA* 3.0 25.8 + - - +
1205 LEU* 4.4 11.0 - - + +
1235 PHE* 4.1 18.4 - - + +
1245 ILE* 3.8 38.6 - - + +
1275 GLN* 4.6 6.5 - - + -
----------------------------------------------------------
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Residues in contact with TYR 102 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
641 ARG* 3.5 15.4 + - - -
1121 LYS 5.4 4.0 - - - -
1131 ASP* 5.4 0.6 + - - -
1141 TYR* 3.6 50.9 - + + -
1151 SER* 2.6 29.3 + - - -
985 SER* 3.0 38.3 + - - -
995 LYS* 3.2 17.7 + - + +
1015 ILE* 1.3 82.0 - - + +
1035 GLU* 1.3 57.5 + - + +
1055 ALA* 3.3 5.8 + - - +
1065 ALA* 2.9 28.3 + - - +
1245 ILE* 4.4 10.5 - - + -
1275 GLN* 6.1 0.2 - - - +
1315 GLU* 5.0 0.5 + - - -
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Residues in contact with GLU 103 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
165 ARG* 5.8 1.9 + - - -
995 LYS* 3.0 41.7 + - + +
1005 SER* 4.0 12.2 - - - +
1015 ILE 3.3 0.4 - - - -
1025 TYR* 1.3 74.1 - - + +
1045 LEU* 1.3 59.2 + - - +
1065 ALA* 3.5 7.6 + - - +
1075 LEU* 3.0 27.9 + - - +
----------------------------------------------------------
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Residues in contact with LEU 104 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
65 MET* 4.1 18.9 - - - +
95 ALA* 3.7 35.0 - - + +
105 LEU* 4.2 10.3 - - + -
135 GLN* 3.6 38.8 - - + +
165 ARG* 5.3 1.6 - - - +
575 PHE* 4.3 3.8 - - + -
1005 SER 3.3 13.7 + - - +
1015 ILE* 3.3 10.2 + - + +
1025 TYR 3.3 0.2 - - - -
1035 GLU* 1.3 76.7 - - - +
1055 ALA* 1.3 59.1 + - - +
1075 LEU* 3.3 6.7 + - + +
1085 ALA* 2.9 29.1 + - - +
1205 LEU* 3.6 27.6 - - + +
----------------------------------------------------------
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Residues in contact with ALA 105 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
1141 TYR* 3.7 23.6 - - + -
1015 ILE 3.0 13.6 + - - +
1025 TYR* 3.5 10.8 - - - +
1045 LEU* 1.3 76.5 - - - +
1065 ALA* 1.3 60.1 + - - +
1085 ALA* 3.6 0.6 + - - -
1095 GLU* 3.2 31.8 + - - +
1175 ARG* 3.7 20.3 - - - +
1205 LEU* 3.7 11.8 - - + +
1245 ILE* 4.4 9.2 - - + -
----------------------------------------------------------
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Residues in contact with ALA 106 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
1141 TYR* 3.5 17.2 + - + +
1025 TYR 2.9 16.6 + - - +
1035 GLU* 3.7 9.0 - - - +
1045 LEU 3.3 0.2 - - - -
1055 ALA* 1.3 75.4 - - - +
1075 LEU* 1.3 63.6 + - - +
1095 GLU* 3.6 4.8 + - - +
1105 GLU* 3.2 24.3 + - - +
----------------------------------------------------------
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Residues in contact with LEU 107 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
55 ARG* 4.4 32.5 - - + +
65 MET* 3.8 19.1 - - + -
95 ALA* 3.8 28.0 - - + -
1035 GLU 3.0 18.1 + - - +
1045 LEU* 3.3 7.4 + - + +
1065 ALA* 1.3 75.0 - - - +
1085 ALA* 1.3 63.6 + - - +
1105 GLU* 3.5 19.3 + - - +
1115 GLU* 3.2 33.3 + - + +
----------------------------------------------------------
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Residues in contact with ALA 108 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
65 MET* 3.6 16.6 - - + +
1045 LEU 2.9 18.0 + - - +
1055 ALA* 3.8 6.1 - - - +
1065 ALA 3.3 0.2 - - - -
1075 LEU* 1.3 78.1 - - - +
1095 GLU* 1.3 56.0 + - - +
1115 GLU 3.5 0.5 + - - -
1125 LYS* 3.0 6.6 + - - -
1135 ASP* 2.8 47.6 + - - +
1165 THR* 4.2 4.0 - - - -
1175 ARG* 3.8 22.7 - - + +
1205 LEU* 4.5 1.3 - - + -
----------------------------------------------------------
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Residues in contact with GLU 109 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
1141 TYR* 3.1 30.5 + - - -
1055 ALA 3.2 15.1 + - - +
1065 ALA* 3.9 5.5 - - - +
1085 ALA* 1.3 74.0 - - - +
1105 GLU* 1.3 65.2 + - - +
1125 LYS* 3.4 17.1 + - - +
1175 ARG* 3.1 35.5 + - + +
1096 GLU* 5.9 2.7 - - - +
----------------------------------------------------------
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Residues in contact with GLU 110 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
1065 ALA 3.2 18.3 + - - +
1075 LEU* 3.7 22.9 - - - +
1085 ALA 3.3 0.2 - - - -
1095 GLU* 1.3 79.0 - - - +
1115 GLU* 1.3 63.0 + - + +
1125 LYS* 3.2 8.0 + - - +
----------------------------------------------------------
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Residues in contact with GLU 111 (chain 5).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
35 SER* 2.7 33.0 + - - -
55 ARG* 3.7 26.4 - - - +
65 MET* 3.7 18.3 - - - +
1075 LEU* 3.2 24.3 + - + +
1085 ALA 4.2 2.2 - - - +
1105 GLU* 1.3 80.1 - - + +
1125 LYS* 1.3 69.9 + - - +
1135 ASP* 3.4 9.3 + - + +
----------------------------------------------------------
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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
------------------------------------------------------------
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