0.018605
0.000000
0.005230
0.000000
0.051546
0.000000
0.000000
0.000000
0.022660
0.000000
0.000000
0.000000
Cruse, W.
Saludjian, P.
Neuman, A.
Prange, T.
http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic
8
90.00
105.70
90.00
53.750
19.400
45.840
C9 H14 N3 O8 P
323.197
y
CYTIDINE-5'-MONOPHOSPHATE
RNA linking
Cl -1
35.453
CHLORIDE ION
non-polymer
C10 H14 N5 O8 P
363.221
y
GUANOSINE-5'-MONOPHOSPHATE
RNA linking
H2 O
18.015
WATER
non-polymer
H18 Ir N6 3
294.400
IRIDIUM HEXAMMINE ION
non-polymer
C9 H13 N2 O9 P
324.181
y
URIDINE-5'-MONOPHOSPHATE
RNA linking
C9 H12 F N2 O8 P
326.172
5-FLUORO-2'-DEOXYURIDINE-5'-MONOPHOSPHATE
DNA linking
N
1
N
O
N
2
N
P
N
3
N
O
N
4
N
O
N
5
N
O
N
6
N
C
N
7
R
C
N
8
N
O
N
9
S
C
N
10
N
O
N
11
R
C
N
12
N
O
N
13
R
C
N
14
N
N
N
15
N
C
N
16
N
O
N
17
N
N
N
18
N
C
N
19
N
N
N
20
N
C
N
21
N
C
N
22
N
H
N
23
N
H
N
24
N
H
N
25
N
H
N
26
N
H
N
27
N
H
N
28
N
H
N
29
N
H
N
30
N
H
N
31
N
H
N
32
N
H
N
33
N
H
N
34
N
H
N
35
N
H
N
36
N
CL
N
37
N
O
N
38
N
P
N
39
N
O
N
40
N
O
N
41
N
O
N
42
N
C
N
43
R
C
N
44
N
O
N
45
S
C
N
46
N
O
N
47
R
C
N
48
N
O
N
49
R
C
Y
50
N
N
Y
51
N
C
Y
52
N
N
Y
53
N
C
N
54
N
C
N
55
N
O
N
56
N
N
N
57
N
C
N
58
N
N
N
59
N
N
Y
60
N
C
N
61
N
H
N
62
N
H
N
63
N
H
N
64
N
H
N
65
N
H
N
66
N
H
N
67
N
H
N
68
N
H
N
69
N
H
N
70
N
H
N
71
N
H
N
72
N
H
N
73
N
H
N
74
N
H
N
75
N
O
N
76
N
H
N
77
N
H
N
78
N
IR
N
79
N
N
N
80
N
N
N
81
N
N
N
82
N
N
N
83
N
N
N
84
N
N
N
85
N
H
N
86
N
H
N
87
N
H
N
88
N
H
N
89
N
H
N
90
N
H
N
91
N
H
N
92
N
H
N
93
N
H
N
94
N
H
N
95
N
H
N
96
N
H
N
97
N
H
N
98
N
H
N
99
N
H
N
100
N
H
N
101
N
H
N
102
N
H
N
103
N
O
N
104
N
P
N
105
N
O
N
106
N
O
N
107
N
O
N
108
N
C
N
109
R
C
N
110
N
O
N
111
S
C
N
112
N
O
N
113
R
C
N
114
N
O
N
115
R
C
N
116
N
N
N
117
N
C
N
118
N
O
N
119
N
N
N
120
N
C
N
121
N
O
N
122
N
C
N
123
N
C
N
124
N
H
N
125
N
H
N
126
N
H
N
127
N
H
N
128
N
H
N
129
N
H
N
130
N
H
N
131
N
H
N
132
N
H
N
133
N
H
N
134
N
H
N
135
N
H
N
136
N
H
N
137
N
N
N
138
N
C
N
139
N
N
N
140
N
C
N
141
N
C
N
142
N
C
N
143
N
O
N
144
N
O
N
145
N
F
N
146
R
C
N
147
N
C
N
148
S
C
N
149
R
C
N
150
N
O
N
151
N
O
N
152
N
C
N
153
N
O
N
154
N
P
N
155
N
O
N
156
N
O
N
157
N
O
N
158
N
H
N
159
N
H
N
160
N
H
N
161
N
H
N
162
N
H
N
163
N
H
N
164
N
H
N
165
N
H
N
166
N
H
N
167
N
H
N
168
N
H
N
169
N
H
N
1
N
sing
N
2
N
sing
N
3
N
doub
N
4
N
sing
N
5
N
sing
N
6
N
sing
N
7
N
sing
N
8
N
sing
N
9
N
sing
N
10
N
sing
N
11
N
sing
N
12
N
sing
N
13
N
sing
N
14
N
sing
N
15
N
sing
N
16
N
sing
N
17
N
sing
N
18
N
sing
N
19
N
sing
N
20
N
sing
N
21
N
sing
N
22
N
sing
N
23
N
sing
N
24
N
sing
N
25
N
sing
N
26
N
sing
N
27
N
doub
N
28
N
sing
N
29
N
doub
N
30
N
sing
N
31
N
sing
N
32
N
sing
N
33
N
sing
N
34
N
doub
N
35
N
sing
N
36
N
sing
N
37
N
sing
N
38
N
sing
N
39
N
doub
N
40
N
sing
N
41
N
sing
N
42
N
sing
N
43
N
sing
N
44
N
sing
N
45
N
sing
N
46
N
sing
N
47
N
sing
N
48
N
sing
N
49
N
sing
N
50
N
sing
N
51
N
sing
N
52
N
sing
N
53
N
sing
N
54
N
sing
N
55
N
sing
N
56
N
sing
N
57
N
sing
N
58
N
sing
N
59
N
sing
N
60
N
sing
Y
61
N
sing
Y
62
N
sing
Y
63
N
doub
N
64
N
sing
Y
65
N
sing
N
66
N
sing
Y
67
N
doub
N
68
N
doub
N
69
N
sing
N
70
N
sing
N
71
N
sing
N
72
N
sing
N
73
N
doub
N
74
N
sing
N
75
N
sing
N
76
N
sing
N
77
N
sing
N
78
N
sing
N
79
N
sing
N
80
N
sing
N
81
N
sing
N
82
N
sing
N
83
N
sing
N
84
N
sing
N
85
N
sing
N
86
N
sing
N
87
N
sing
N
88
N
sing
N
89
N
sing
N
90
N
sing
N
91
N
sing
N
92
N
sing
N
93
N
sing
N
94
N
sing
N
95
N
sing
N
96
N
sing
N
97
N
sing
N
98
N
sing
N
99
N
sing
N
100
N
sing
N
101
N
sing
N
102
N
sing
N
103
N
sing
N
104
N
sing
N
105
N
doub
N
106
N
sing
N
107
N
sing
N
108
N
sing
N
109
N
sing
N
110
N
sing
N
111
N
sing
N
112
N
sing
N
113
N
sing
N
114
N
sing
N
115
N
sing
N
116
N
sing
N
117
N
sing
N
118
N
sing
N
119
N
sing
N
120
N
sing
N
121
N
sing
N
122
N
sing
N
123
N
sing
N
124
N
sing
N
125
N
sing
N
126
N
sing
N
127
N
sing
N
128
N
sing
N
129
N
doub
N
130
N
sing
N
131
N
sing
N
132
N
sing
N
133
N
doub
N
134
N
sing
N
135
N
doub
N
136
N
sing
N
137
N
sing
N
138
N
sing
N
139
N
sing
N
140
N
sing
N
141
N
sing
N
142
N
doub
N
143
N
sing
N
144
N
sing
N
145
N
sing
N
146
N
doub
N
147
N
doub
N
148
N
sing
N
149
N
sing
N
150
N
sing
N
151
N
sing
N
152
N
sing
N
153
N
sing
N
154
N
sing
N
155
N
sing
N
156
N
sing
N
157
N
sing
N
158
N
sing
N
159
N
sing
N
160
N
sing
N
161
N
sing
N
162
N
sing
N
163
N
sing
N
164
N
sing
N
165
N
sing
N
166
N
sing
N
167
N
doub
N
168
N
sing
N
169
N
sing
N
170
N
sing
N
171
N
sing
DK
Acta Crystallogr.,Sect.D
ABCRE6
0766
0907-4449
57
1609
1613
10.1107/S0907444901012318
11679725
Destabilizing effect of a fluorouracil extra base in a hybrid RNA duplex compared with bromo and chloro analogues.
2001
US
Proc.Natl.Acad.Sci.USA
PNASA6
0040
0027-8424
91
4160
4164
Structure of a Mispaired RNA Double Helix at 1.6 A Resolution and Implications for the Prediction of RNA Secondary Structure
1994
10.2210/pdb1icg/pdb
pdb_00001icg
1.000000
0.000000
0.000000
0.000000
1.000000
0.000000
0.000000
0.000000
1.000000
0.00000
0.00000
0.00000
277
1
Si(III) curvated crystal
IMAGE PLATE
1998-10-10
MARRESEARCH
Si(III)
SINGLE WAVELENGTH
M
x-ray
1
0.967
1.0
DW32
LURE
0.967
SYNCHROTRON
LURE BEAMLINE DW32
2826.694
5'-R(*GP*CP*UP*UP*CP*GP*GP*C)-D(P*(UFP))-3'
2
syn
polymer
35.453
CHLORIDE ION
2
syn
non-polymer
294.400
IRIDIUM HEXAMMINE ION
2
syn
non-polymer
18.015
water
49
nat
water
no
yes
GCUUCGGC(UFP)
GCUUCGGCN
A,B
polydeoxyribonucleotide/polyribonucleotide hybrid
n
n
n
n
n
n
n
n
n
1
2.03
39.55
VAPOR DIFFUSION, SITTING DROP
6.5
cacodylate, iridium hexammine, MPD, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 277K
277
cacodylate
1
Iridium hexammine
1
MPD
1
MPD
2
-7.457
1
19
A
1
B
8
-0.226
A_G1:C8_B
1
-10.242
-0.116
-0.145
-0.141
0.591
1
19
A
2
B
7
-0.964
A_C2:G7_B
2
-11.051
0.060
0.122
-0.191
3.345
28
A
3
B
6
-3.220
A_U3:G6_B
3
-7.995
2.554
0.136
-0.598
0.798
A
4
B
5
-41.887
A_U4:C5_B
4
0.630
-0.636
-0.044
0.087
10.606
A
5
B
4
-43.201
A_C5:U4_B
5
-3.793
0.526
-0.251
0.171
0.851
28
A
6
B
3
-2.077
A_G6:U3_B
6
-10.233
-2.358
-0.305
-0.664
-6.867
1
19
A
7
B
2
-0.885
A_G7:C2_B
7
-13.082
-0.230
-0.045
-0.204
-5.184
1
19
A
8
B
1
-2.370
A_C8:G1_B
8
-2.530
0.250
0.125
-0.197
2.811
33.146
A
A
1
2
11.595
B
B
8
7
3.104
6.555
-0.597
-1.480
AA_G1C2:G7C8_BB
1
-4.287
7.582
32.233
-3.605
0.385
3.022
42.431
A
A
2
3
8.255
B
B
7
6
3.233
5.955
0.035
-1.348
AA_C2U3:G6G7_BB
2
1.709
-2.369
41.997
-2.445
0.118
2.881
19.501
A
A
3
4
18.567
B
B
6
5
3.377
6.176
-3.840
-1.914
AA_U3U4:C5G6_BB
3
-1.461
4.391
18.448
-8.631
10.634
2.890
39.079
A
A
4
5
11.438
B
B
5
4
3.312
7.605
-0.120
-1.952
AA_U4C5:U4C5_BB
4
-0.977
1.470
38.348
-3.794
0.067
2.711
28.157
A
A
5
6
24.812
B
B
4
3
3.578
11.714
3.214
-1.661
AA_C5G6:U3U4_BB
5
1.152
-2.441
25.624
-6.180
-6.335
3.307
39.924
A
A
6
7
7.977
B
B
3
2
3.580
5.426
0.222
-1.646
AA_G6G7:C2U3_BB
6
-3.178
4.673
39.446
-3.073
-0.713
3.183
34.107
A
A
7
8
3.445
B
B
2
1
3.303
2.019
0.091
-1.985
AA_G7C8:G1C2_BB
7
0.102
-0.175
34.049
-3.702
-0.138
chem_comp_atom
chem_comp_bond
database_2
pdbx_initial_refinement_model
struct_conn
struct_site
repository
Initial release
Version format compliance
Version format compliance
Data collection
Database references
Derived calculations
Refinement description
1
0
2001-04-09
1
1
2008-04-27
1
2
2011-07-13
1
3
2023-08-09
_database_2.pdbx_DOI
_database_2.pdbx_database_accession
_struct_conn.pdbx_leaving_atom_flag
_struct_site.pdbx_auth_asym_id
_struct_site.pdbx_auth_comp_id
_struct_site.pdbx_auth_seq_id
A bromo-U replaces the fluoro-U
and Rh(III) hexammine cations
replace the Ir(III) hexammine
cations.
RCSB
Y
RCSB
2001-03-31
REL
REL
CL
CHLORIDE ION
IRI
IRIDIUM HEXAMMINE ION
HOH
water
phosphoramidite method
sample
165D
PDB ENTRY 165D
PDB
experimental model
CL
32
2
CL
CL
32
A
IRI
19
3
IRI
IRI
19
A
IRI
20
3
IRI
IRI
20
A
CL
31
2
CL
CL
31
B
HOH
101
4
HOH
HOH
101
A
HOH
102
4
HOH
HOH
102
A
HOH
103
4
HOH
HOH
103
A
HOH
105
4
HOH
HOH
105
A
HOH
107
4
HOH
HOH
107
A
HOH
112
4
HOH
HOH
112
A
HOH
113
4
HOH
HOH
113
A
HOH
114
4
HOH
HOH
114
A
HOH
116
4
HOH
HOH
116
A
HOH
117
4
HOH
HOH
117
A
HOH
118
4
HOH
HOH
118
A
HOH
119
4
HOH
HOH
119
A
HOH
121
4
HOH
HOH
121
A
HOH
124
4
HOH
HOH
124
A
HOH
126
4
HOH
HOH
126
A
HOH
127
4
HOH
HOH
127
A
HOH
128
4
HOH
HOH
128
A
HOH
131
4
HOH
HOH
131
A
HOH
135
4
HOH
HOH
135
A
HOH
137
4
HOH
HOH
137
A
HOH
140
4
HOH
HOH
140
A
HOH
141
4
HOH
HOH
141
A
HOH
142
4
HOH
HOH
142
A
HOH
149
4
HOH
HOH
149
A
HOH
104
4
HOH
HOH
104
B
HOH
106
4
HOH
HOH
106
B
HOH
108
4
HOH
HOH
108
B
HOH
109
4
HOH
HOH
109
B
HOH
110
4
HOH
HOH
110
B
HOH
111
4
HOH
HOH
111
B
HOH
115
4
HOH
HOH
115
B
HOH
120
4
HOH
HOH
120
B
HOH
122
4
HOH
HOH
122
B
HOH
123
4
HOH
HOH
123
B
HOH
125
4
HOH
HOH
125
B
HOH
129
4
HOH
HOH
129
B
HOH
130
4
HOH
HOH
130
B
HOH
132
4
HOH
HOH
132
B
HOH
133
4
HOH
HOH
133
B
HOH
134
4
HOH
HOH
134
B
HOH
136
4
HOH
HOH
136
B
HOH
138
4
HOH
HOH
138
B
HOH
139
4
HOH
HOH
139
B
HOH
143
4
HOH
HOH
143
B
HOH
144
4
HOH
HOH
144
B
HOH
145
4
HOH
HOH
145
B
HOH
146
4
HOH
HOH
146
B
HOH
147
4
HOH
HOH
147
B
HOH
148
4
HOH
HOH
148
B
G
1
n
1
G
1
A
C
2
n
2
C
2
A
U
3
n
3
U
3
A
U
4
n
4
U
4
A
C
5
n
5
C
5
A
G
6
n
6
G
6
A
G
7
n
7
G
7
A
C
8
n
8
C
8
A
+U
9
n
9
UFP
9
A
G
1
n
1
G
1
B
C
2
n
2
C
2
B
U
3
n
3
U
3
B
U
4
n
4
U
4
B
C
5
n
5
C
5
B
G
6
n
6
G
6
B
G
7
n
7
G
7
B
C
8
n
8
C
8
B
+U
9
n
9
UFP
9
B
author_defined_assembly
2
dimeric
1.0000000000
0.0000000000
0.0000000000
0.0000000000
1.0000000000
0.0000000000
0.0000000000
0.0000000000
1.0000000000
1_555
x,y,z
identity operation
0.0000000000
0.0000000000
0.0000000000
1
3.43
0.50
119.90
123.33
A
A
A
C2
N3
C4
C
C
C
2
2
2
N
1
-3.22
0.40
121.90
118.68
A
A
A
N3
C4
C5
C
C
C
2
2
2
N
1
3.59
0.50
121.00
124.59
A
A
A
C5
C6
N1
C
C
C
2
2
2
N
1
5.10
0.70
108.50
113.60
A
A
A
O4'
C1'
N1
U
U
U
3
3
3
N
1
-5.30
0.60
127.00
121.70
A
A
A
C2
N3
C4
U
U
U
3
3
3
N
1
4.39
0.60
114.60
118.99
A
A
A
N3
C4
C5
U
U
U
3
3
3
N
1
-4.28
0.70
122.20
117.92
A
A
A
N3
C2
O2
U
U
U
3
3
3
N
1
-4.49
0.60
125.90
121.41
A
A
A
C5
C4
O4
U
U
U
3
3
3
N
1
4.37
0.60
114.90
119.27
A
A
A
N1
C2
N3
U
U
U
4
4
4
N
1
-4.45
0.60
127.00
122.55
A
A
A
C2
N3
C4
U
U
U
4
4
4
N
1
-4.07
0.60
125.90
121.83
A
A
A
C5
C4
O4
U
U
U
4
4
4
N
1
-5.28
0.60
128.60
123.32
A
A
A
C5
C6
O6
G
G
G
6
6
6
N
1
-3.49
0.40
121.90
118.41
A
A
A
N3
C4
C5
C
C
C
8
8
8
N
1
-5.03
0.60
128.60
123.57
B
B
B
C5
C6
O6
G
G
G
1
1
1
N
1
-5.33
0.80
109.40
104.07
B
B
B
O5'
C5'
C4'
C
C
C
2
2
2
N
1
3.23
0.50
119.90
123.13
B
B
B
C2
N3
C4
C
C
C
2
2
2
N
1
-2.71
0.40
121.90
119.19
B
B
B
N3
C4
C5
C
C
C
2
2
2
N
1
4.67
0.70
119.40
124.07
B
B
B
N3
C4
O4
U
U
U
3
3
3
N
1
-6.10
0.60
125.90
119.80
B
B
B
C5
C4
O4
U
U
U
3
3
3
N
1
3.61
0.60
114.90
118.51
B
B
B
N1
C2
N3
U
U
U
4
4
4
N
1
-4.42
0.60
127.00
122.58
B
B
B
C2
N3
C4
U
U
U
4
4
4
N
1
-6.04
0.60
125.90
119.86
B
B
B
C5
C4
O4
U
U
U
4
4
4
N
1
5.32
0.70
108.50
113.82
B
B
B
O4'
C1'
N9
G
G
G
6
6
6
N
1
4.25
0.70
108.50
112.75
B
B
B
O4'
C1'
N1
C
C
C
8
8
8
N
1
-2.62
0.40
121.90
119.28
B
B
B
N3
C4
C5
C
C
C
8
8
8
N
18.5
the two iridium and the two chlorine atoms were refined anisotropically
0.205
0.177
0.18
0.177
1.53
8
562
6772
6518
96.2
RANDOM
1
ISOTROPIC
THROUGHOUT
2
4
MOLECULAR REPLACEMENT
PDB ENTRY 165D
LOCAL DICTIONARY FROM SMALL MOLECULE STRUCTURES
1.53
8
49
437
18
370
0
0.012
0.026
0.075
0.027
0.291
0.02
0.235
1.6
51
75.3
0.291
0.02
0.235
1.8
152
88.2
0.291
0.02
0.235
2.0
89
95.1
0.291
0.02
0.235
4.0
233
97.5
0.291
0.02
0.235
10.0
37
96.4
13.5
1.53
10.
1ICG
6772
6518
2.0
4.0
0.044
0.046
1
25.
6.5
91.5
0.156
1.53
1.6
4.4
729
0.167
3.
75.
data reduction
MOSFLM
data scaling
SCALA
phasing
AMoRE
refinement
SHELXL-97
data scaling
CCP4
(SCALA)
STRUCTURE OF THE HYBRID RNA/DNA R-GCUUCGGC-D[F]U IN PRESENCE OF IR(NH3)6+++
1
N
N
1
N
N
2
N
N
3
N
N
3
N
N
2
N
N
4
N
N
4
N
N
covale
1.589
both
A
C
8
A
O3'
C
8
1_555
A
UFP
9
A
P
UFP
9
1_555
covale
1.611
both
B
C
8
B
O3'
C
8
1_555
B
UFP
9
B
P
UFP
9
1_555
hydrog
WATSON-CRICK
A
G
1
A
N1
G
1
1_555
B
C
8
B
N3
C
8
1_555
hydrog
WATSON-CRICK
A
G
1
A
N2
G
1
1_555
B
C
8
B
O2
C
8
1_555
hydrog
WATSON-CRICK
A
G
1
A
O6
G
1
1_555
B
C
8
B
N4
C
8
1_555
hydrog
WATSON-CRICK
A
C
2
A
N3
C
2
1_555
B
G
7
B
N1
G
7
1_555
hydrog
WATSON-CRICK
A
C
2
A
N4
C
2
1_555
B
G
7
B
O6
G
7
1_555
hydrog
WATSON-CRICK
A
C
2
A
O2
C
2
1_555
B
G
7
B
N2
G
7
1_555
hydrog
TYPE_28_PAIR
A
U
3
A
N3
U
3
1_555
B
G
6
B
O6
G
6
1_555
hydrog
TYPE_28_PAIR
A
U
3
A
O2
U
3
1_555
B
G
6
B
N1
G
6
1_555
hydrog
U-C MISPAIR
A
U
4
A
O4
U
4
1_555
B
C
5
B
N4
C
5
1_555
hydrog
C-U MISPAIR
A
C
5
A
N4
C
5
1_555
B
U
4
B
O4
U
4
1_555
hydrog
TYPE_28_PAIR
A
G
6
A
N1
G
6
1_555
B
U
3
B
O2
U
3
1_555
hydrog
TYPE_28_PAIR
A
G
6
A
O6
G
6
1_555
B
U
3
B
N3
U
3
1_555
hydrog
WATSON-CRICK
A
G
7
A
N1
G
7
1_555
B
C
2
B
N3
C
2
1_555
hydrog
WATSON-CRICK
A
G
7
A
N2
G
7
1_555
B
C
2
B
O2
C
2
1_555
hydrog
WATSON-CRICK
A
G
7
A
O6
G
7
1_555
B
C
2
B
N4
C
2
1_555
hydrog
WATSON-CRICK
A
C
8
A
N3
C
8
1_555
B
G
1
B
N1
G
1
1_555
hydrog
WATSON-CRICK
A
C
8
A
N4
C
8
1_555
B
G
1
B
O6
G
1
1_555
hydrog
WATSON-CRICK
A
C
8
A
O2
C
8
1_555
B
G
1
B
N2
G
1
1_555
DNA/RNA
RNA/DNA HYBRID, FLUORO-URACIL, C-U MISMATCH, G-U MISMATCH, RHODIUM HEXAMMINE, IRIDIUM HEXAMMINE, DNA-RNA COMPLEX
1ICG
PDB
1
1ICG
1
9
1ICG
1
9
1ICG
A
1
1
9
1
9
1ICG
1
9
1ICG
B
1
1
9
BINDING SITE FOR RESIDUE CL B 31
B
CL
31
Software
1
BINDING SITE FOR RESIDUE IRI A 19
A
IRI
19
Software
5
BINDING SITE FOR RESIDUE IRI A 20
A
IRI
20
Software
7
B
HOH
111
H
HOH
1
1_555
A
C
5
A
C
5
5
1_555
A
G
6
A
G
6
5
1_555
A
G
7
A
G
7
5
1_555
A
HOH
117
G
HOH
5
1_555
A
HOH
142
G
HOH
5
1_555
A
C
5
A
C
5
7
4_545
A
G
7
A
G
7
7
1_545
A
C
8
A
C
8
7
1_545
A
HOH
116
G
HOH
7
1_545
A
HOH
137
G
HOH
7
1_545
B
C
5
B
C
5
7
4_545
B
HOH
109
H
HOH
7
4_545
5
C 1 2 1