Analysis of interatomic Contacts of Structural Units in PDB entry:
8HWB


Contacts of Structural Units (CSU) 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).
For CSU analysis of other PDB entry

This page provides analyses of contacts formed by:
For analysis of ligand-protein contacts, use: 3D structure can be seen in additional window with STING software for 8HWB entry

There are 8 chains in PDB entry 8HWB (CSU analysis of residue contacts immediately below table)
Chain ID Initial residueTerminal residue
A
GLY 323LYS 701
B
GLY 323LYS 701
C
GLY 323LYS 701
D
MET 1LEU 700
E
MET 1LEU 700
F
GLY 323LYS 701
S
T 1 T 6
K
MET 1VAL 231
Residue contacts

1. List of contacts for up to 10 consecutive residues:
Chain ID from residue number to residue number


2. Detailed analyses of contacts for any single residue:
Residue number chain ID
Back to top of page

There are150 helices in PDB entry 8HWB. Click on helix of interest for CSU analysis.
Helix
number
Helix
ID
Chain
ID
Initial
residue
Terminal
residue
Helix class
Helix 1
AA1
A
325 336Right-handed alpha
Helix 2
AA2
A
363 372Right-handed alpha
Helix 3
AA3
A
373 375Right-handed 310
Helix 4
AA4
A
376 384Right-handed 310
Helix 5
AA5
A
385 398Right-handed alpha
Helix 6
AA6
A
429 434Right-handed 310
Helix 7
AA7
A
447 451Right-handed 310
Helix 8
AA8
A
455 469Right-handed alpha
Helix 9
AA9
A
476 488Right-handed alpha
Helix 10
AB1
A
489 491Right-handed 310
Helix 11
AB2
A
508 521Right-handed alpha
Helix 12
AB3
A
528 532Right-handed 310
Helix 13
AB4
A
541 546Right-handed alpha
Helix 14
AB5
A
570 578Right-handed alpha
Helix 15
AB6
A
632 634Right-handed 310
Helix 16
AB7
A
635 641Right-handed alpha
Helix 17
AB8
A
653 660Right-handed alpha
Helix 18
AB9
A
664 680Right-handed alpha
Helix 19
AC1
A
693 700Right-handed alpha
Helix 20
AC2
B
325 336Right-handed alpha
Helix 21
AC3
B
363 372Right-handed alpha
Helix 22
AC4
B
373 375Right-handed 310
Helix 23
AC5
B
376 381Right-handed alpha
Helix 24
AC6
B
382 384Right-handed 310
Helix 25
AC7
B
385 398Right-handed alpha
Helix 26
AC8
B
429 435Right-handed 310
Helix 27
AC9
B
447 451Right-handed 310
Helix 28
AD1
B
455 469Right-handed alpha
Helix 29
AD2
B
475 488Right-handed alpha
Helix 30
AD3
B
508 521Right-handed alpha
Helix 31
AD4
B
528 532Right-handed 310
Helix 32
AD5
B
541 546Right-handed alpha
Helix 33
AD6
B
570 577Right-handed alpha
Helix 34
AD7
B
632 634Right-handed 310
Helix 35
AD8
B
635 641Right-handed alpha
Helix 36
AD9
B
653 660Right-handed alpha
Helix 37
AE1
B
664 680Right-handed alpha
Helix 38
AE2
B
693 700Right-handed alpha
Helix 39
AE3
C
324 336Right-handed alpha
Helix 40
AE4
C
363 372Right-handed alpha
Helix 41
AE5
C
373 375Right-handed 310
Helix 42
AE6
C
376 381Right-handed alpha
Helix 43
AE7
C
385 398Right-handed alpha
Helix 44
AE8
C
429 435Right-handed 310
Helix 45
AE9
C
447 451Right-handed 310
Helix 46
AF1
C
455 469Right-handed alpha
Helix 47
AF2
C
475 488Right-handed alpha
Helix 48
AF3
C
508 521Right-handed alpha
Helix 49
AF4
C
528 532Right-handed 310
Helix 50
AF5
C
541 546Right-handed alpha
Helix 51
AF6
C
570 577Right-handed alpha
Helix 52
AF7
C
614 619Right-handed alpha
Helix 53
AF8
C
632 634Right-handed 310
Helix 54
AF9
C
635 641Right-handed alpha
Helix 55
AG1
C
653 660Right-handed alpha
Helix 56
AG2
C
664 680Right-handed alpha
Helix 57
AG3
C
689 692Right-handed 310
Helix 58
AG4
C
693 699Right-handed alpha
Helix 59
AG5
D
2 7Right-handed alpha
Helix 60
AG6
D
20 25Right-handed alpha
Helix 61
AG7
D
36 47Right-handed alpha
Helix 62
AG8
D
78 104Right-handed alpha
Helix 63
AG9
D
108 119Right-handed alpha
Helix 64
AH1
D
144 160Right-handed alpha
Helix 65
AH2
D
163 168Right-handed alpha
Helix 66
AH3
D
203 208Right-handed 310
Helix 67
AH4
D
226 231Right-handed alpha
Helix 68
AH5
D
242 254Right-handed alpha
Helix 69
AH6
D
260 264Right-handed 310
Helix 70
AH7
D
310 314Right-handed 310
Helix 71
AH8
D
325 336Right-handed alpha
Helix 72
AH9
D
363 372Right-handed alpha
Helix 73
AI1
D
373 375Right-handed 310
Helix 74
AI2
D
376 381Right-handed alpha
Helix 75
AI3
D
385 398Right-handed alpha
Helix 76
AI4
D
431 435Right-handed 310
Helix 77
AI5
D
455 469Right-handed alpha
Helix 78
AI6
D
472 474Right-handed 310
Helix 79
AI7
D
475 488Right-handed alpha
Helix 80
AI8
D
508 521Right-handed alpha
Helix 81
AI9
D
528 532Right-handed 310
Helix 82
AJ1
D
541 546Right-handed alpha
Helix 83
AJ2
D
570 576Right-handed alpha
Helix 84
AJ3
D
614 619Right-handed alpha
Helix 85
AJ4
D
635 641Right-handed alpha
Helix 86
AJ5
D
654 659Right-handed alpha
Helix 87
AJ6
D
664 680Right-handed alpha
Helix 88
AJ7
D
689 692Right-handed 310
Helix 89
AJ8
D
693 700Right-handed alpha
Helix 90
AJ9
E
2 6Right-handed alpha
Helix 91
AK1
E
20 25Right-handed alpha
Helix 92
AK2
E
36 47Right-handed alpha
Helix 93
AK3
E
78 105Right-handed alpha
Helix 94
AK4
E
108 119Right-handed alpha
Helix 95
AK5
E
144 150Right-handed alpha
Helix 96
AK6
E
150 160Right-handed alpha
Helix 97
AK7
E
163 168Right-handed alpha
Helix 98
AK8
E
203 208Right-handed 310
Helix 99
AK9
E
226 230Right-handed 310
Helix 100
AL1
E
242 254Right-handed alpha
Helix 101
AL2
E
310 314Right-handed 310
Helix 102
AL3
E
325 336Right-handed alpha
Helix 103
AL4
E
363 372Right-handed alpha
Helix 104
AL5
E
373 375Right-handed 310
Helix 105
AL6
E
376 381Right-handed alpha
Helix 106
AL7
E
382 384Right-handed 310
Helix 107
AL8
E
385 398Right-handed alpha
Helix 108
AL9
E
431 435Right-handed 310
Helix 109
AM1
E
447 451Right-handed 310
Helix 110
AM2
E
455 469Right-handed alpha
Helix 111
AM3
E
472 474Right-handed 310
Helix 112
AM4
E
475 488Right-handed alpha
Helix 113
AM5
E
508 521Right-handed alpha
Helix 114
AM6
E
528 533Right-handed 310
Helix 115
AM7
E
541 546Right-handed alpha
Helix 116
AM8
E
570 577Right-handed alpha
Helix 117
AM9
E
632 634Right-handed 310
Helix 118
AN1
E
635 642Right-handed alpha
Helix 119
AN2
E
654 659Right-handed alpha
Helix 120
AN3
E
664 680Right-handed alpha
Helix 121
AN4
E
689 692Right-handed 310
Helix 122
AN5
E
693 698Right-handed alpha
Helix 123
AN6
F
324 336Right-handed alpha
Helix 124
AN7
F
363 372Right-handed alpha
Helix 125
AN8
F
373 375Right-handed 310
Helix 126
AN9
F
376 381Right-handed alpha
Helix 127
AO1
F
385 398Right-handed alpha
Helix 128
AO2
F
429 434Right-handed 310
Helix 129
AO3
F
455 469Right-handed alpha
Helix 130
AO4
F
472 474Right-handed 310
Helix 131
AO5
F
475 488Right-handed alpha
Helix 132
AO6
F
508 521Right-handed alpha
Helix 133
AO7
F
528 532Right-handed 310
Helix 134
AO8
F
570 577Right-handed alpha
Helix 135
AO9
F
614 619Right-handed alpha
Helix 136
AP1
F
632 634Right-handed 310
Helix 137
AP2
F
635 641Right-handed alpha
Helix 138
AP3
F
654 659Right-handed alpha
Helix 139
AP4
F
664 680Right-handed alpha
Helix 140
AP5
F
689 692Right-handed 310
Helix 141
AP6
F
693 699Right-handed alpha
Helix 142
AP7
K
2 7Right-handed 310
Helix 143
AP8
K
20 26Right-handed alpha
Helix 144
AP9
K
36 47Right-handed alpha
Helix 145
AQ1
K
78 104Right-handed alpha
Helix 146
AQ2
K
108 119Right-handed alpha
Helix 147
AQ3
K
144 150Right-handed alpha
Helix 148
AQ4
K
150 160Right-handed alpha
Helix 149
AQ5
K
163 168Right-handed alpha
Helix 150
AQ6
K
203 208Right-handed 310
Back to top of page

There are 45 sheets in PDB entry 8HWB. Click on sheet of interest to get list of strands forming it: AA1, AA2, AA3, AA4, AA5, AA6, AA7, AA8, AA9, AB1, AB2, AB3, AB4, AB5, AB6, AB7, AB8, AB9, AC1, AC2, AC3, AC4, AC5, AC6, AC7, AC8, AC9, AD1, AD2, AD3, AD4, AD5, AD6, AD7, AD8, AD9, AE1, AE2, AE3, AE4, AE5, AE6, AE7, AE8, AE9,

There are 2 strands in AA1 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
A
340 341first strand
Strand 2
A
347 348anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AA2 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
A
412 415first strand
Strand 2
A
418 421anti-parallel
Strand 3
A
427 428anti-parallel
Back to list of sheets
Back to top of page

There are 5 strands in AA3 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
A
524 526first strand
Strand 2
A
552 556parallel
Strand 3
A
601 603parallel
Strand 4
A
499 503parallel
Strand 5
A
622 626parallel
Back to list of sheets
Back to top of page

There are 2 strands in AA4 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
A
582 583first strand
Strand 2
A
593 594anti-parallel
Back to list of sheets
Back to top of page

There are 2 strands in AA5 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
A
629 631first strand
Strand 2
A
648 650parallel
Back to list of sheets
Back to top of page

There are 3 strands in AA6 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
B
339 341first strand
Strand 2
B
347 350anti-parallel
Strand 3
B
355 356anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AA7 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
B
412 415first strand
Strand 2
B
418 421anti-parallel
Strand 3
B
427 428anti-parallel
Back to list of sheets
Back to top of page

There are 5 strands in AA8 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
B
525 526first strand
Strand 2
B
553 556parallel
Strand 3
B
600 603parallel
Strand 4
B
498 503parallel
Strand 5
B
621 626parallel
Back to list of sheets
Back to top of page

There are 2 strands in AA9 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
B
581 583first strand
Strand 2
B
593 595anti-parallel
Back to list of sheets
Back to top of page

There are 2 strands in AB1 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
B
629 631first strand
Strand 2
B
648 650parallel
Back to list of sheets
Back to top of page

There are 3 strands in AB2 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
C
340 341first strand
Strand 2
C
347 350anti-parallel
Strand 3
C
355 356anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AB3 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
C
412 415first strand
Strand 2
C
418 421anti-parallel
Strand 3
C
427 428anti-parallel
Back to list of sheets
Back to top of page

There are 5 strands in AB4 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
C
525 526first strand
Strand 2
C
553 554parallel
Strand 3
C
600 603parallel
Strand 4
C
498 503parallel
Strand 5
C
621 626parallel
Back to list of sheets
Back to top of page

There are 2 strands in AB5 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
C
581 583first strand
Strand 2
C
593 595anti-parallel
Back to list of sheets
Back to top of page

There are 2 strands in AB6 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
C
629 631first strand
Strand 2
C
648 650parallel
Back to list of sheets
Back to top of page

There are 3 strands in AB7 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
32 35first strand
Strand 2
D
11 14anti-parallel
Strand 3
D
53 55anti-parallel
Back to list of sheets
Back to top of page

There are 4 strands in AB8 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
64 73first strand
Strand 2
D
131 143anti-parallel
Strand 3
D
120 125anti-parallel
Strand 4
D
195 197anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AB9 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
64 73first strand
Strand 2
D
131 143anti-parallel
Strand 3
D
219 220parallel
Back to list of sheets
Back to top of page

There are 3 strands in AC1 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
294 299first strand
Strand 2
D
302 307anti-parallel
Strand 3
D
317 320anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AC2 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
339 341first strand
Strand 2
D
347 351anti-parallel
Strand 3
D
354 356anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AC3 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
412 415first strand
Strand 2
D
418 421anti-parallel
Strand 3
D
427 428anti-parallel
Back to list of sheets
Back to top of page

There are 5 strands in AC4 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
525 526first strand
Strand 2
D
553 555parallel
Strand 3
D
600 603parallel
Strand 4
D
498 503parallel
Strand 5
D
621 626parallel
Back to list of sheets
Back to top of page

There are 2 strands in AC5 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
581 583first strand
Strand 2
D
593 595anti-parallel
Back to list of sheets
Back to top of page

There are 2 strands in AC6 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
D
629 631first strand
Strand 2
D
648 650parallel
Back to list of sheets
Back to top of page

There are 2 strands in AC7 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
7 8first strand
Strand 2
E
212 213anti-parallel
Back to list of sheets
Back to top of page

There are 4 strands in AC8 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
32 35first strand
Strand 2
E
11 14anti-parallel
Strand 3
E
53 55anti-parallel
Strand 4
E
179 181anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AC9 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
64 73first strand
Strand 2
E
131 143anti-parallel
Strand 3
E
120 122anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AD1 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
64 73first strand
Strand 2
E
131 143anti-parallel
Strand 3
E
219 220parallel
Back to list of sheets
Back to top of page

There are 2 strands in AD2 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
124 125first strand
Strand 2
E
195 196anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AD3 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
294 295first strand
Strand 2
E
302 307anti-parallel
Strand 3
E
298 299anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AD4 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
294 295first strand
Strand 2
E
302 307anti-parallel
Strand 3
E
317 320anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AD5 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
339 341first strand
Strand 2
E
347 351anti-parallel
Strand 3
E
354 356anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AD6 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
412 415first strand
Strand 2
E
418 421anti-parallel
Strand 3
E
427 428anti-parallel
Back to list of sheets
Back to top of page

There are 5 strands in AD7 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
525 527first strand
Strand 2
E
552 555parallel
Strand 3
E
599 604parallel
Strand 4
E
498 502parallel
Strand 5
E
621 625parallel
Back to list of sheets
Back to top of page

There are 2 strands in AD8 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
581 583first strand
Strand 2
E
593 595anti-parallel
Back to list of sheets
Back to top of page

There are 2 strands in AD9 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
E
629 631first strand
Strand 2
E
648 650parallel
Back to list of sheets
Back to top of page

There are 2 strands in AE1 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
F
340 341first strand
Strand 2
F
347 348anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AE2 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
F
412 415first strand
Strand 2
F
418 421anti-parallel
Strand 3
F
427 428anti-parallel
Back to list of sheets
Back to top of page

There are 5 strands in AE3 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
F
525 527first strand
Strand 2
F
553 555parallel
Strand 3
F
600 603parallel
Strand 4
F
498 503parallel
Strand 5
F
621 626parallel
Back to list of sheets
Back to top of page

There are 2 strands in AE4 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
F
628 631first strand
Strand 2
F
647 650parallel
Back to list of sheets
Back to top of page

There are 4 strands in AE5 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
K
33 35first strand
Strand 2
K
11 14anti-parallel
Strand 3
K
53 55anti-parallel
Strand 4
K
179 180anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AE6 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
K
64 68first strand
Strand 2
K
136 143anti-parallel
Strand 3
K
120 121anti-parallel
Back to list of sheets
Back to top of page

There are 3 strands in AE7 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
K
64 68first strand
Strand 2
K
136 143anti-parallel
Strand 3
K
219 220parallel
Back to list of sheets
Back to top of page

There are 2 strands in AE8 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
K
71 73first strand
Strand 2
K
131 133anti-parallel
Back to list of sheets
Back to top of page

There are 2 strands in AE9 sheet. Click on strand of interest for CSU analysis.
Strand
number
Chain
ID
Initial
residue
Terminal
residue
Strand sense
Strand 1
K
124 125first strand
Strand 2
K
195 196anti-parallel
Back to list of sheets
Back to top of page

Please mail questions/suggestions concerning this page to Vladimir.Sobolev@weizmann. ac.il