Analysis of interatomic Contacts of Structural Units in PDB entry:
7Q21

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).
This page provides analyses of contacts formed by:

chains
helices
sheets
residues

For analysis of ligand-protein contacts, use:

LPC software

3D structure can be seen in additional window with STING software for 7Q21 entry

There are 26 chains in PDB entry 7Q21 (CSU analysis of residue contacts immediately below table)

Chain ID	Initial residue	Terminal residue
Y	UNK 1	UNK 96
E	ALA 17	GLN 205
H	PRO 10	ALA 134
F	MET 1	HIS 143
G	ALA 32	GLN 356
D	MET 1	GLY 573
A	TYR 9	SER 408
L	CYS 27	VAL 179
B	SER 2	ASN 535
C	ASP 52	SER 283
y	UNK 1	UNK 91
e	ALA 17	GLN 205
h	GLU 9	ALA 134
f	MET 1	HIS 143
g	ALA 32	GLN 356
d	MET 1	GLY 573
a	TYR 9	SER 408
l	CYS 27	VAL 179
b	SER 2	ASN 535
c	ASP 52	SER 283
X	CYS 27	UNK 47
x	CYS 27	UNK 48
V	PHE 9	ASN 62
v	PHE 9	ASN 62
K	MET 1	ILE 63
k	MET 1	ILE 63

There are215 helices in PDB entry 7Q21. Click on helix of interest for CSU analysis.

Helix number	Helix ID	Chain ID	Initial residue	Terminal residue	Helix class
Helix 1	AA1	Y	29	39	Right-handed alpha
Helix 2	AA2	Y	40	46	Right-handed alpha
Helix 3	AA3	Y	56	66	Right-handed alpha
Helix 4	AA4	Y	72	83	Right-handed alpha
Helix 5	AA5	Y	83	88	Right-handed alpha
Helix 6	AA6	E	23	58	Right-handed alpha
Helix 7	AA7	E	59	65	Right-handed alpha
Helix 8	AA8	E	68	95	Right-handed alpha
Helix 9	AA9	E	97	125	Right-handed alpha
Helix 10	AB1	E	136	170	Right-handed alpha
Helix 11	AB2	E	173	202	Right-handed alpha
Helix 12	AB3	H	32	50	Right-handed alpha
Helix 13	AB4	H	60	80	Right-handed alpha
Helix 14	AB5	H	103	110	Right-handed alpha
Helix 15	AB6	H	119	126	Right-handed alpha
Helix 16	AB7	F	2	7	Right-handed alpha
Helix 17	AB8	F	8	27	Right-handed alpha
Helix 18	AB9	F	41	65	Right-handed alpha
Helix 19	AC1	F	70	74	Right-handed 310
Helix 20	AC2	F	78	82	Right-handed 310
Helix 21	AC3	F	94	113	Right-handed alpha
Helix 22	AC4	F	114	134	Right-handed alpha
Helix 23	AC5	G	36	44	Right-handed alpha
Helix 24	AC6	G	51	85	Right-handed alpha
Helix 25	AC7	G	106	137	Right-handed alpha
Helix 26	AC8	G	177	186	Right-handed alpha
Helix 27	AC9	G	187	189	Right-handed 310
Helix 28	AD1	G	290	296	Right-handed 310
Helix 29	AD2	G	304	318	Right-handed alpha
Helix 30	AD3	G	322	330	Right-handed alpha
Helix 31	AD4	D	28	35	Right-handed alpha
Helix 32	AD5	D	37	67	Right-handed alpha
Helix 33	AD6	D	76	90	Right-handed alpha
Helix 34	AD7	D	96	113	Right-handed alpha
Helix 35	AD8	D	119	139	Right-handed alpha
Helix 36	AD9	D	140	143	Right-handed 310
Helix 37	AE1	D	167	197	Right-handed alpha
Helix 38	AE2	D	203	207	Right-handed 310
Helix 39	AE3	D	208	223	Right-handed alpha
Helix 40	AE4	D	224	242	Right-handed alpha
Helix 41	AE5	D	247	250	Right-handed 310
Helix 42	AE6	D	251	269	Right-handed alpha
Helix 43	AE7	D	272	287	Right-handed alpha
Helix 44	AE8	D	293	308	Right-handed alpha
Helix 45	AE9	D	309	311	Right-handed 310
Helix 46	AF1	D	312	320	Right-handed 310
Helix 47	AF2	D	323	334	Right-handed alpha
Helix 48	AF3	D	334	350	Right-handed alpha
Helix 49	AF4	D	357	381	Right-handed alpha
Helix 50	AF5	D	382	390	Right-handed alpha
Helix 51	AF6	D	392	424	Right-handed alpha
Helix 52	AF7	D	428	456	Right-handed alpha
Helix 53	AF8	D	471	486	Right-handed alpha
Helix 54	AF9	D	488	502	Right-handed alpha
Helix 55	AG1	D	517	522	Right-handed 310
Helix 56	AG2	D	541	548	Right-handed alpha
Helix 57	AG3	D	551	558	Right-handed alpha
Helix 58	AG4	A	10	15	Right-handed alpha
Helix 59	AG5	A	18	29	Right-handed alpha
Helix 60	AG6	A	48	77	Right-handed alpha
Helix 61	AG7	A	88	93	Right-handed alpha
Helix 62	AG8	A	94	119	Right-handed alpha
Helix 63	AG9	A	137	155	Right-handed alpha
Helix 64	AH1	A	160	180	Right-handed alpha
Helix 65	AH2	A	181	185	Right-handed 310
Helix 66	AH3	A	209	216	Right-handed 310
Helix 67	AH4	A	270	272	Right-handed 310
Helix 68	AH5	A	284	293	Right-handed alpha
Helix 69	AH6	A	308	312	Right-handed 310
Helix 70	AH7	L	115	119	Right-handed 310
Helix 71	AH8	B	3	15	Right-handed alpha
Helix 72	AH9	B	16	22	Right-handed alpha
Helix 73	AI1	B	31	34	Right-handed 310
Helix 74	AI2	B	35	55	Right-handed alpha
Helix 75	AI3	B	71	75	Right-handed 310
Helix 76	AI4	B	80	92	Right-handed alpha
Helix 77	AI5	B	95	125	Right-handed alpha
Helix 78	AI6	B	131	154	Right-handed alpha
Helix 79	AI7	B	158	174	Right-handed alpha
Helix 80	AI8	B	182	187	Right-handed alpha
Helix 81	AI9	B	195	206	Right-handed alpha
Helix 82	AJ1	B	206	226	Right-handed alpha
Helix 83	AJ2	B	248	272	Right-handed alpha
Helix 84	AJ3	B	295	297	Right-handed 310
Helix 85	AJ4	B	298	308	Right-handed alpha
Helix 86	AJ5	B	322	339	Right-handed alpha
Helix 87	AJ6	B	339	349	Right-handed alpha
Helix 88	AJ7	B	359	362	Right-handed 310
Helix 89	AJ8	B	363	384	Right-handed alpha
Helix 90	AJ9	B	385	394	Right-handed alpha
Helix 91	AK1	B	396	437	Right-handed alpha
Helix 92	AK2	B	481	485	Right-handed 310
Helix 93	AK3	B	500	535	Right-handed alpha
Helix 94	AK4	C	53	62	Right-handed alpha
Helix 95	AK5	C	89	99	Right-handed alpha
Helix 96	AK6	C	119	132	Right-handed alpha
Helix 97	AK7	C	162	177	Right-handed alpha
Helix 98	AK8	C	203	214	Right-handed alpha
Helix 99	AK9	C	227	244	Right-handed alpha
Helix 100	AL1	C	256	266	Right-handed alpha
Helix 101	AL2	C	267	280	Right-handed alpha
Helix 102	AL3	y	17	20	Right-handed 310
Helix 103	AL4	y	21	33	Right-handed alpha
Helix 104	AL5	y	34	37	Right-handed 310
Helix 105	AL6	y	38	43	Right-handed alpha
Helix 106	AL7	y	60	78	Right-handed alpha
Helix 107	AL8	y	82	87	Right-handed alpha
Helix 108	AL9	e	23	55	Right-handed alpha
Helix 109	AM1	e	59	64	Right-handed alpha
Helix 110	AM2	e	65	67	Right-handed 310
Helix 111	AM3	e	68	94	Right-handed alpha
Helix 112	AM4	e	97	128	Right-handed alpha
Helix 113	AM5	e	132	135	Right-handed 310
Helix 114	AM6	e	136	165	Right-handed alpha
Helix 115	AM7	e	173	203	Right-handed alpha
Helix 116	AM8	h	32	50	Right-handed alpha
Helix 117	AM9	h	58	78	Right-handed alpha
Helix 118	AN1	h	103	110	Right-handed alpha
Helix 119	AN2	h	112	116	Right-handed 310
Helix 120	AN3	h	119	125	Right-handed alpha
Helix 121	AN4	h	129	133	Right-handed 310
Helix 122	AN5	f	3	8	Right-handed alpha
Helix 123	AN6	f	8	27	Right-handed alpha
Helix 124	AN7	f	43	66	Right-handed alpha
Helix 125	AN8	f	70	74	Right-handed 310
Helix 126	AN9	f	78	83	Right-handed 310
Helix 127	AO1	f	94	113	Right-handed alpha
Helix 128	AO2	f	114	134	Right-handed alpha
Helix 129	AO3	g	36	44	Right-handed alpha
Helix 130	AO4	g	51	85	Right-handed alpha
Helix 131	AO5	g	106	110	Right-handed 310
Helix 132	AO6	g	114	137	Right-handed alpha
Helix 133	AO7	g	177	186	Right-handed alpha
Helix 134	AO8	g	187	189	Right-handed 310
Helix 135	AO9	g	290	296	Right-handed 310
Helix 136	AP1	g	304	318	Right-handed alpha
Helix 137	AP2	g	322	330	Right-handed alpha
Helix 138	AP3	d	30	35	Right-handed alpha
Helix 139	AP4	d	37	67	Right-handed alpha
Helix 140	AP5	d	76	94	Right-handed alpha
Helix 141	AP6	d	95	113	Right-handed alpha
Helix 142	AP7	d	119	139	Right-handed alpha
Helix 143	AP8	d	140	143	Right-handed 310
Helix 144	AP9	d	167	197	Right-handed alpha
Helix 145	AQ1	d	203	207	Right-handed 310
Helix 146	AQ2	d	208	222	Right-handed alpha
Helix 147	AQ3	d	224	241	Right-handed alpha
Helix 148	AQ4	d	252	269	Right-handed alpha
Helix 149	AQ5	d	272	288	Right-handed alpha
Helix 150	AQ6	d	293	308	Right-handed alpha
Helix 151	AQ7	d	312	320	Right-handed 310
Helix 152	AQ8	d	323	334	Right-handed alpha
Helix 153	AQ9	d	334	350	Right-handed alpha
Helix 154	AR1	d	357	376	Right-handed alpha
Helix 155	AR2	d	376	381	Right-handed alpha
Helix 156	AR3	d	382	390	Right-handed alpha
Helix 157	AR4	d	392	424	Right-handed alpha
Helix 158	AR5	d	428	449	Right-handed alpha
Helix 159	AR6	d	449	456	Right-handed alpha
Helix 160	AR7	d	472	487	Right-handed alpha
Helix 161	AR8	d	488	503	Right-handed alpha
Helix 162	AR9	d	517	522	Right-handed 310
Helix 163	AS1	d	541	548	Right-handed alpha
Helix 164	AS2	d	549	552	Right-handed 310
Helix 165	AS3	d	553	558	Right-handed alpha
Helix 166	AS4	a	10	14	Right-handed 310
Helix 167	AS5	a	18	29	Right-handed alpha
Helix 168	AS6	a	46	57	Right-handed alpha
Helix 169	AS7	a	57	76	Right-handed alpha
Helix 170	AS8	a	88	94	Right-handed alpha
Helix 171	AS9	a	94	121	Right-handed alpha
Helix 172	AT1	a	137	154	Right-handed alpha
Helix 173	AT2	a	160	179	Right-handed alpha
Helix 174	AT3	a	180	185	Right-handed 310
Helix 175	AT4	a	208	214	Right-handed 310
Helix 176	AT5	a	270	272	Right-handed 310
Helix 177	AT6	a	274	278	Right-handed 310
Helix 178	AT7	a	284	293	Right-handed alpha
Helix 179	AT8	a	308	312	Right-handed 310
Helix 180	AT9	l	115	119	Right-handed 310
Helix 181	AU1	b	3	12	Right-handed alpha
Helix 182	AU2	b	16	24	Right-handed alpha
Helix 183	AU3	b	31	34	Right-handed 310
Helix 184	AU4	b	35	55	Right-handed alpha
Helix 185	AU5	b	80	87	Right-handed alpha
Helix 186	AU6	b	95	125	Right-handed alpha
Helix 187	AU7	b	132	154	Right-handed alpha
Helix 188	AU8	b	158	174	Right-handed alpha
Helix 189	AU9	b	178	187	Right-handed alpha
Helix 190	AV1	b	196	205	Right-handed alpha
Helix 191	AV2	b	206	227	Right-handed alpha
Helix 192	AV3	b	248	272	Right-handed alpha
Helix 193	AV4	b	276	280	Right-handed 310
Helix 194	AV5	b	295	297	Right-handed 310
Helix 195	AV6	b	298	307	Right-handed alpha
Helix 196	AV7	b	322	339	Right-handed alpha
Helix 197	AV8	b	339	345	Right-handed alpha
Helix 198	AV9	b	359	362	Right-handed 310
Helix 199	AW1	b	363	385	Right-handed alpha
Helix 200	AW2	b	385	393	Right-handed alpha
Helix 201	AW3	b	396	437	Right-handed alpha
Helix 202	AW4	b	480	485	Right-handed 310
Helix 203	AW5	b	500	534	Right-handed alpha
Helix 204	AW6	c	53	65	Right-handed alpha
Helix 205	AW7	c	89	99	Right-handed alpha
Helix 206	AW8	c	119	132	Right-handed alpha
Helix 207	AW9	c	162	176	Right-handed alpha
Helix 208	AX1	c	203	213	Right-handed alpha
Helix 209	AX2	c	227	244	Right-handed alpha
Helix 210	AX3	c	256	266	Right-handed alpha
Helix 211	AX4	c	267	280	Right-handed alpha
Helix 212	AX5	K	2	25	Right-handed alpha
Helix 213	AX6	K	29	53	Right-handed alpha
Helix 214	AX7	k	2	25	Right-handed alpha
Helix 215	AX8	k	29	53	Right-handed alpha

There are 32 sheets in PDB entry 7Q21. 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,

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	H	12	13	first strand
Strand 2	H	16	17	anti-parallel

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There are 2 strands in AA2 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	89	91	first strand
Strand 2	K	60	62	anti-parallel

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There are 3 strands in AA3 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	85	88	first strand
Strand 2	B	438	445	anti-parallel
Strand 3	B	451	456	anti-parallel

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There are 3 strands in AA4 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	173	174	first strand
Strand 2	G	154	162	anti-parallel
Strand 3	G	214	216	anti-parallel

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There are 5 strands in AA5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	173	174	first strand
Strand 2	G	154	162	anti-parallel
Strand 3	G	144	151	anti-parallel
Strand 4	G	233	239	parallel
Strand 5	G	269	271	anti-parallel

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There are 5 strands in AA6 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	224	228	first strand
Strand 2	G	298	303	parallel
Strand 3	G	279	285	anti-parallel
Strand 4	G	244	248	anti-parallel
Strand 5	G	253	257	anti-parallel

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There are 4 strands in AA7 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	32	38	first strand
Strand 2	A	124	130	anti-parallel
Strand 3	B	240	245	anti-parallel
Strand 4	B	27	28	anti-parallel

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There are 6 strands in AA8 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	248	250	first strand
Strand 2	A	219	224	anti-parallel
Strand 3	A	260	268	anti-parallel
Strand 4	A	299	303	anti-parallel
Strand 5	A	326	330	anti-parallel
Strand 6	A	378	379	anti-parallel

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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	A	230	234	first strand
Strand 2	A	237	241	anti-parallel

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There are 4 strands in AB1 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	342	343	first strand
Strand 2	A	349	351	anti-parallel
Strand 3	A	358	360	anti-parallel
Strand 4	A	367	369	anti-parallel

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There are 2 strands in AB2 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	381	383	first strand
Strand 2	A	389	391	anti-parallel

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There are 6 strands in AB3 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	L	54	56	first strand
Strand 2	L	69	77	anti-parallel
Strand 3	L	60	63	anti-parallel
Strand 4	L	158	166	parallel
Strand 5	L	147	154	anti-parallel
Strand 6	L	87	91	anti-parallel

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There are 4 strands in AB4 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	L	54	56	first strand
Strand 2	L	69	77	anti-parallel
Strand 3	L	109	114	anti-parallel
Strand 4	L	130	134	parallel

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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	B	65	66	first strand
Strand 2	B	78	79	anti-parallel

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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	188	189	first strand
Strand 2	C	195	196	anti-parallel

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There are 2 strands in AB7 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	e	21	22	first strand
Strand 2	v	29	30	anti-parallel

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There are 2 strands in AB8 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	h	90	91	first strand
Strand 2	k	60	61	anti-parallel

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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	f	84	85	first strand
Strand 2	b	438	445	anti-parallel
Strand 3	b	451	456	anti-parallel

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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	g	173	174	first strand
Strand 2	g	154	162	anti-parallel
Strand 3	g	214	216	anti-parallel

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There are 5 strands in AC2 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	g	173	174	first strand
Strand 2	g	154	162	anti-parallel
Strand 3	g	144	151	anti-parallel
Strand 4	g	233	239	parallel
Strand 5	g	269	271	anti-parallel

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There are 5 strands in AC3 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	g	224	228	first strand
Strand 2	g	298	303	parallel
Strand 3	g	279	285	anti-parallel
Strand 4	g	244	248	anti-parallel
Strand 5	g	253	257	anti-parallel

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There are 2 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	425	426	first strand
Strand 2	d	504	505	anti-parallel

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There are 4 strands in AC5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	a	32	38	first strand
Strand 2	a	124	130	anti-parallel
Strand 3	b	240	245	anti-parallel
Strand 4	b	27	28	anti-parallel

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There are 6 strands in AC6 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	a	248	250	first strand
Strand 2	a	219	224	anti-parallel
Strand 3	a	260	268	anti-parallel
Strand 4	a	299	303	anti-parallel
Strand 5	a	326	330	anti-parallel
Strand 6	a	378	379	anti-parallel

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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	a	231	233	first strand
Strand 2	a	238	240	anti-parallel

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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	a	342	343	first strand
Strand 2	a	349	351	anti-parallel
Strand 3	a	358	360	anti-parallel
Strand 4	a	367	369	anti-parallel

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There are 2 strands in AC9 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	a	381	383	first strand
Strand 2	a	389	391	anti-parallel

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There are 6 strands in AD1 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	l	54	56	first strand
Strand 2	l	69	77	anti-parallel
Strand 3	l	60	63	anti-parallel
Strand 4	l	158	166	parallel
Strand 5	l	147	154	anti-parallel
Strand 6	l	87	91	anti-parallel

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There are 4 strands in AD2 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	l	54	56	first strand
Strand 2	l	69	77	anti-parallel
Strand 3	l	110	114	anti-parallel
Strand 4	l	130	134	parallel

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There are 2 strands in AD3 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	b	65	66	first strand
Strand 2	b	78	79	anti-parallel

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There are 2 strands in AD4 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	b	313	314	first strand
Strand 2	b	319	320	anti-parallel

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There are 2 strands in AD5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	c	188	189	first strand
Strand 2	c	195	196	anti-parallel

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

Analysis of interatomic Contacts of Structural Units in PDB entry: 7Q21

Analysis of interatomic Contacts of Structural Units in PDB entry:
7Q21