Contacts of the helix formed by residues 5 - 39 (chain F) in PDB entry 4E45
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 ALA 5 (chain F).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
4F GLU* 1.3 76.0 - - - +
6F GLU* 1.3 65.3 + - - +
8F GLU* 3.6 7.1 + - - +
9F GLU* 3.1 24.4 + - - +
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Residues in contact with GLU 6 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
4F GLU 3.3 6.2 - - - +
5F ALA* 1.3 79.0 - - - +
7F THR* 1.3 56.6 + - - +
9F GLU* 3.5 5.8 + - - +
10F GLN* 3.0 27.2 + - - +
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Residues in contact with THR 7 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
4F GLU* 3.3 18.3 + - - +
5F ALA 3.2 0.4 - - - -
6F GLU* 1.3 76.0 - - - +
8F GLU* 1.3 66.6 + - - +
9F GLU 3.1 1.3 - - - -
10F GLN* 3.3 6.0 + - - +
11F GLN* 3.0 48.2 + - - +
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Residues in contact with GLU 8 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
4F GLU 3.0 15.8 + - - +
5F ALA* 3.8 9.0 - - - +
7F THR* 1.3 77.2 - - - +
9F GLU* 1.3 57.8 + - - +
11F GLN* 3.3 6.9 + - - +
12F ARG* 2.9 30.8 + - - +
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Residues in contact with GLU 9 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
5F ALA 3.1 15.0 + - - +
6F GLU* 3.7 6.3 - - - +
7F THR 3.1 0.6 - - - -
8F GLU* 1.3 77.9 - - - +
10F GLN* 1.3 64.1 + - - +
12F ARG* 2.8 47.5 + - - +
13F PHE* 3.1 24.6 + - - +
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Residues in contact with GLN 10 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
6F GLU 3.0 16.6 + - - +
7F THR* 3.3 7.4 + - - +
9F GLU* 1.3 76.4 - - - +
11F GLN* 1.3 60.0 + - + +
13F PHE* 3.6 6.8 + - - +
14F SER* 3.1 28.1 + - - -
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Residues in contact with GLN 11 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
7F THR* 3.0 38.7 + - - +
8F GLU* 3.8 5.4 - - - +
10F GLN* 1.3 78.3 - - + +
12F ARG* 1.3 64.0 + - - +
14F SER* 3.2 8.8 + - - +
15F TYR* 3.0 26.9 + - - +
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Residues in contact with ARG 12 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
8F GLU 2.9 21.9 + - - +
9F GLU* 2.8 43.8 + - - +
11F GLN* 1.3 73.7 - - - +
13F PHE* 1.3 76.4 + - - +
15F TYR* 3.7 5.8 - - - +
16F GLN* 2.9 56.4 + - + +
21G LEU* 6.0 7.2 - - + +
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Residues in contact with PHE 13 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
9F GLU* 3.1 20.7 + - - +
10F GLN* 3.8 7.6 - - - +
11F GLN 3.3 0.2 - - - -
12F ARG* 1.3 95.4 - - - +
14F SER* 1.3 61.2 + - - +
16F GLN* 3.3 28.1 + - - +
17F GLN* 2.9 59.4 + - + +
784J TYR* 3.9 16.8 - + - -
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Residues in contact with SER 14 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
10F GLN 3.1 13.7 + - - -
11F GLN* 3.2 14.2 + - - +
13F PHE* 1.3 82.2 - - - +
15F TYR* 1.3 59.7 + - - +
17F GLN 3.4 0.3 + - - -
18F ARG* 3.0 26.0 + - - +
784J TYR* 3.8 30.6 - - - -
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Residues in contact with TYR 15 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
11F GLN 3.0 19.3 + - - +
12F ARG* 3.7 6.3 - - - +
14F SER* 1.3 75.3 + - - +
16F GLN* 1.3 66.2 + - - +
18F ARG* 3.0 39.5 + - - +
19F LEU* 3.0 35.7 + - + +
17G ARG* 2.8 53.4 + - - +
21G LEU* 4.2 26.2 - - + -
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Residues in contact with GLN 16 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
12F ARG* 2.9 38.7 + - + +
13F PHE* 3.4 24.6 - - - +
15F TYR* 1.3 77.0 - - - +
17F GLN* 1.3 81.3 + - - +
19F LEU* 3.2 6.9 + - - +
20F LYS* 2.9 49.9 + - - +
55F PHE* 4.1 17.4 - - + -
21G LEU* 5.1 9.6 - - + +
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Residues in contact with GLN 17 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
13F PHE* 2.9 53.5 + - + +
14F SER 3.8 0.2 - - - +
16F GLN* 1.3 106.0 + - - +
18F ARG* 1.3 57.3 + - - +
20F LYS* 3.6 14.4 + - - +
21F ALA* 2.9 29.6 + - - +
780J GLU* 3.3 30.7 + - - +
781J VAL* 3.9 16.3 - - - +
784J TYR* 3.5 32.1 - - + +
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Residues in contact with ARG 18 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
14F SER 3.0 13.6 + - - +
15F TYR* 3.0 29.7 + - - +
17F GLN* 1.3 77.4 - - - +
19F LEU* 1.3 66.6 + - + +
21F ALA* 3.3 4.3 + - - +
22F ALA* 3.1 21.3 + - - +
17G ARG* 3.8 37.5 - - - +
784J TYR* 3.7 20.9 - - + +
785J LEU* 5.0 0.9 - - - -
786J GLN* 3.1 40.8 + - + +
788J GLU* 4.5 7.7 + - - +
789J ASP* 2.9 39.2 + - - +
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Residues in contact with LEU 19 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
15F TYR* 3.0 46.0 + - + +
16F GLN 3.8 5.4 - - - +
18F ARG* 1.3 84.6 - - + +
20F LYS* 1.3 63.5 + - - +
22F ALA* 3.2 2.8 + - - +
23F VAL* 2.9 28.6 + - - +
55F PHE* 4.1 4.3 - - + -
14G LEU* 3.7 24.3 - - + +
17G ARG* 4.0 36.3 - - + +
18G LEU* 3.9 16.6 - - + -
21G LEU* 3.9 21.8 - - + -
789J ASP* 4.9 0.9 - - - +
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Residues in contact with LYS 20 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
16F GLN* 2.9 48.4 + - - +
17F GLN* 3.6 19.4 + - - +
19F LEU* 1.3 75.7 - - - +
21F ALA* 1.3 57.2 + - - +
23F VAL* 3.4 4.0 + - - +
24F HIS* 2.8 31.1 + - - +
51F SER* 5.2 0.5 - - - -
52F GLU* 2.9 35.8 + - - +
55F PHE* 3.8 36.1 - - + -
777J TYR* 3.9 13.0 + - + +
781J VAL* 4.1 15.0 - - + -
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Residues in contact with ALA 21 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
17F GLN 2.9 15.0 + - - +
18F ARG 3.6 3.1 - - - +
19F LEU 3.3 0.2 - - - -
20F LYS* 1.3 78.5 - - - +
22F ALA* 1.3 57.9 + - - +
24F HIS* 3.7 2.4 + - - +
25F TYR* 3.0 27.9 + - - +
781J VAL* 3.2 39.0 - - + +
782J GLU* 4.8 0.9 - - - +
785J LEU* 3.5 31.9 - - + +
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Residues in contact with ALA 22 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
18F ARG 3.1 13.0 + - - +
19F LEU 3.2 7.4 + - - +
21F ALA* 1.3 76.4 - - - +
23F VAL* 1.3 59.7 + - - +
25F TYR 3.4 0.5 + - - -
26F THR* 2.7 33.1 + - - -
14G LEU* 3.7 20.9 - - + -
785J LEU* 3.8 7.1 - - + +
789J ASP* 3.8 17.3 - - + +
790J VAL* 3.6 24.2 - - + +
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Residues in contact with VAL 23 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
19F LEU 2.9 21.6 + - - +
20F LYS* 3.7 6.1 - - - +
22F ALA* 1.3 74.6 - - - +
24F HIS* 1.3 57.1 + - - +
26F THR* 3.1 2.9 + - - -
27F VAL* 2.8 46.5 + - + +
51F SER* 3.7 24.5 - - - +
54F THR* 3.9 16.6 - - + -
55F PHE* 4.1 11.9 - - + +
58F CYS* 5.7 0.9 - - - -
10G PHE* 4.3 14.1 - - + -
14G LEU* 4.7 1.8 - - + -
18G LEU* 4.0 33.2 - - + -
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Residues in contact with HIS 24 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
20F LYS 2.8 18.1 + - - +
21F ALA 3.7 4.6 + - - +
22F ALA 3.3 0.2 - - - -
23F VAL* 1.3 74.7 - - - +
25F TYR* 1.3 65.4 + - - +
27F VAL* 3.9 0.5 - - - +
28F GLY* 3.0 20.8 + - - -
44F LYS 5.3 1.6 + - - -
47F ILE* 4.2 15.2 - - + +
48F ALA* 4.1 10.9 + - - +
51F SER* 3.3 34.1 - - - +
775J CYS* 5.9 0.4 - - - -
777J TYR* 3.9 20.3 - + + -
778J GLU* 3.9 42.6 + - + +
781J VAL* 4.0 15.2 - - + +
782J GLU* 6.0 1.4 - - + +
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Residues in contact with TYR 25 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
21F ALA 3.0 16.6 + - - +
22F ALA 3.6 5.2 - - - +
23F VAL 3.3 0.2 - - - -
24F HIS* 1.3 80.5 + - - +
26F THR* 1.3 66.8 + - - +
28F GLY* 3.3 2.1 + - - -
29F CYS* 3.2 42.5 + - - -
785J LEU* 3.9 26.0 - - + -
787J MET* 3.9 25.1 - - + +
790J VAL* 3.7 29.6 - - + -
791J THR 4.4 15.8 + - - -
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Residues in contact with THR 26 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
22F ALA 2.7 20.6 + - - -
23F VAL 3.1 4.3 + - - -
25F TYR* 1.3 77.5 - - - +
27F VAL* 1.3 66.9 + - - +
29F CYS* 3.0 9.7 + - + +
30F LEU* 2.9 26.1 + - + +
8G SER* 5.8 0.2 - - - -
9G GLY* 3.4 39.6 + - - +
10G PHE* 3.8 32.7 - - + +
14G LEU* 4.5 2.6 - - - +
790J VAL* 3.8 14.0 - - - +
791J THR 5.6 0.2 + - - -
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Residues in contact with VAL 27 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
23F VAL* 2.8 36.5 + - + +
24F HIS 3.9 0.2 - - - +
26F THR* 1.3 70.3 - - - +
28F GLY* 1.3 57.8 + - - +
30F LEU* 3.3 2.2 + - - +
31F CYS* 2.8 39.0 + - - -
47F ILE* 3.9 9.0 - - + +
50F ILE* 3.6 26.0 - - + -
51F SER* 3.4 30.3 - - - +
54F THR* 4.2 2.7 - - - +
10G PHE* 4.4 3.6 - - + -
46G VAL* 4.1 28.7 - - + -
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Residues in contact with GLY 28 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
24F HIS 3.0 15.0 + - - -
25F TYR 3.3 3.8 + - - -
27F VAL* 1.3 78.6 - - - +
29F CYS* 1.3 61.4 + - - +
31F CYS* 3.4 2.1 + - - +
32F GLU* 3.0 23.9 + - - +
47F ILE* 4.0 21.1 - - - +
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Residues in contact with CYS 29 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
25F TYR* 3.2 44.2 + - - -
26F THR* 3.0 10.4 + - - +
28F GLY* 1.3 75.9 - - - +
30F LEU* 1.3 62.8 + - - +
32F GLU* 3.2 15.2 + - - +
33F GLU* 3.2 19.2 + - - +
8G SER* 3.8 21.5 - - - -
791J THR 6.0 2.7 - - - -
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Residues in contact with LEU 30 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
26F THR* 2.9 26.0 + - + +
27F VAL 3.8 3.8 - - - +
29F CYS* 1.3 76.1 - - - +
31F CYS* 1.3 60.4 + - - +
33F GLU* 3.2 19.7 + - - +
34F VAL* 3.1 25.7 + - - +
8G SER* 3.6 28.9 - - - +
9G GLY* 4.8 1.1 - - - -
10G PHE* 3.9 29.6 - - + -
43G LYS* 4.1 27.8 - - + +
46G VAL* 4.0 26.9 - - + -
47G VAL* 4.7 9.7 - - + +
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Residues in contact with CYS 31 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
27F VAL* 2.8 43.2 + - - +
28F GLY 4.0 2.7 - - - +
30F LEU* 1.3 71.3 - - - +
32F GLU* 1.3 60.7 + - - +
34F VAL* 3.2 7.5 + - - +
35F ALA* 2.8 29.1 + - - +
42F PHE* 3.5 16.2 - - + -
47F ILE* 4.2 23.6 - - + -
50F ILE* 4.1 15.9 - - - -
46G VAL* 4.5 7.0 - - - -
50G ALA* 4.1 19.5 - - - -
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Residues in contact with GLU 32 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
28F GLY 3.0 17.1 + - - +
29F CYS* 3.2 7.4 + - - +
31F CYS* 1.3 77.1 - - - +
33F GLU* 1.3 63.0 + - + +
35F ALA* 3.4 4.9 + - - +
36F LEU* 3.1 40.0 + - + +
41F GLN* 3.7 21.7 + - - +
47F ILE* 6.0 0.4 - - - +
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Residues in contact with GLU 33 (chain F).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
29F CYS 3.2 11.6 + - - +
30F LEU* 3.2 21.3 + - - +
32F GLU* 1.3 80.0 - - + +
34F VAL* 1.3 62.9 + - + +
36F LEU* 3.4 9.8 + - + +
37F ASP* 3.0 23.3 + - - +
8G SER* 3.0 41.7 + - - +
43G LYS* 5.2 5.5 + - - -
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Residues in contact with VAL 34 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
30F LEU 3.1 15.5 + - - +
31F CYS 3.2 6.3 + - - +
33F GLU* 1.3 78.1 - - + +
35F ALA* 1.3 56.4 + - - +
37F ASP* 3.2 6.1 + - - +
38F LYS* 2.8 40.5 + - + +
42F PHE* 3.9 17.7 - - + -
47G VAL* 4.1 28.0 - - + -
50G ALA* 4.1 19.3 - - + -
51G VAL* 3.7 25.6 - - + +
54G VAL* 4.6 1.8 - - + -
----------------------------------------------------------
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Residues in contact with ALA 35 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
31F CYS 2.8 17.3 + - - +
32F GLU* 3.7 11.7 - - - +
34F VAL* 1.3 77.4 - - - +
36F LEU* 1.3 56.0 + - - +
38F LYS* 5.1 0.9 - - - -
39F GLU* 2.9 23.9 + - - -
40F MET 2.9 34.6 + - - +
41F GLN* 3.9 24.1 + - - +
42F PHE* 3.8 12.3 - - + -
----------------------------------------------------------
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Residues in contact with LEU 36 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
32F GLU* 3.1 31.3 + - + +
33F GLU* 3.6 13.0 - - + +
34F VAL 3.2 0.2 - - - -
35F ALA* 1.3 73.9 - - - +
37F ASP* 1.3 65.7 + - - +
38F LYS 3.4 0.5 + - - -
39F GLU* 3.4 16.5 + - - +
41F GLN* 5.7 0.9 - - - +
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Residues in contact with ASP 37 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
33F GLU 3.0 17.2 + - - +
34F VAL* 3.6 6.7 - - - +
36F LEU* 1.3 79.2 - - - +
38F LYS* 1.3 87.2 + - - +
39F GLU* 3.8 5.0 + - - +
----------------------------------------------------------
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Residues in contact with LYS 38 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
34F VAL* 2.8 31.3 + - + +
35F ALA 5.1 0.2 - - - -
37F ASP* 1.3 93.0 + - - +
39F GLU* 1.3 72.8 + - - +
40F MET* 3.3 5.7 + - - +
51G VAL* 3.6 36.5 - - + +
54G VAL* 4.0 29.8 - - + -
58G GLN* 4.4 12.2 + - - +
711J SER 5.4 3.1 + - - -
712J SER* 5.8 1.8 - - - +
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Residues in contact with GLU 39 (chain F).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
35F ALA 2.9 11.1 + - - -
36F LEU 3.4 13.2 + - - +
37F ASP 3.4 4.8 - - - +
38F LYS* 1.3 83.1 - - - +
40F MET* 1.3 61.5 + - - +
41F GLN* 5.6 1.3 - - - +
----------------------------------------------------------
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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) + - + + + + + -
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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