Analysis of interatomic Contacts of Structural Units in PDB entry:
21AK

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 21AK entry

There are 12 chains in PDB entry 21AK (CSU analysis of residue contacts immediately below table)

Chain ID	Initial residue	Terminal residue
A	MET 1	GLN 300
B	MET 1	GLN 300
C	MET 1	GLN 300
D	MET 1	GLN 300
E	MET 1	GLN 300
F	MET 1	GLN 300
G	ARG 317	VAL 653
H	ARG 317	VAL 653
I	ARG 317	VAL 653
J	ARG 317	VAL 653
K	ARG 317	VAL 653
L	ARG 317	VAL 653

There are138 helices in PDB entry 21AK. Click on helix of interest for CSU analysis.

Helix number	Helix ID	Chain ID	Initial residue	Terminal residue	Helix class
Helix 1	AA1	A	8	22	Right-handed alpha
Helix 2	AA2	A	44	52	Right-handed alpha
Helix 3	AA3	A	64	75	Right-handed alpha
Helix 4	AA4	A	89	94	Right-handed alpha
Helix 5	AA5	A	115	124	Right-handed alpha
Helix 6	AA6	A	157	177	Right-handed alpha
Helix 7	AA7	A	177	183	Right-handed alpha
Helix 8	AA8	A	213	225	Right-handed alpha
Helix 9	AA9	A	288	297	Right-handed alpha
Helix 10	AB1	B	8	22	Right-handed alpha
Helix 11	AB2	B	44	53	Right-handed alpha
Helix 12	AB3	B	64	75	Right-handed alpha
Helix 13	AB4	B	89	96	Right-handed alpha
Helix 14	AB5	B	115	124	Right-handed alpha
Helix 15	AB6	B	157	182	Right-handed alpha
Helix 16	AB7	B	202	207	Right-handed 310
Helix 17	AB8	B	213	225	Right-handed alpha
Helix 18	AB9	B	288	297	Right-handed alpha
Helix 19	AC1	C	8	23	Right-handed alpha
Helix 20	AC2	C	44	52	Right-handed alpha
Helix 21	AC3	C	64	75	Right-handed alpha
Helix 22	AC4	C	89	96	Right-handed alpha
Helix 23	AC5	C	115	123	Right-handed alpha
Helix 24	AC6	C	157	182	Right-handed alpha
Helix 25	AC7	C	213	224	Right-handed alpha
Helix 26	AC8	C	289	297	Right-handed alpha
Helix 27	AC9	D	8	23	Right-handed alpha
Helix 28	AD1	D	44	53	Right-handed alpha
Helix 29	AD2	D	64	75	Right-handed alpha
Helix 30	AD3	D	89	94	Right-handed alpha
Helix 31	AD4	D	115	121	Right-handed alpha
Helix 32	AD5	D	157	183	Right-handed alpha
Helix 33	AD6	D	213	224	Right-handed alpha
Helix 34	AD7	D	288	297	Right-handed alpha
Helix 35	AD8	E	8	23	Right-handed alpha
Helix 36	AD9	E	44	53	Right-handed alpha
Helix 37	AE1	E	64	75	Right-handed alpha
Helix 38	AE2	E	89	94	Right-handed alpha
Helix 39	AE3	E	115	123	Right-handed alpha
Helix 40	AE4	E	157	183	Right-handed alpha
Helix 41	AE5	E	202	206	Right-handed 310
Helix 42	AE6	E	213	225	Right-handed alpha
Helix 43	AE7	E	288	297	Right-handed alpha
Helix 44	AE8	F	8	22	Right-handed alpha
Helix 45	AE9	F	44	53	Right-handed alpha
Helix 46	AF1	F	64	75	Right-handed alpha
Helix 47	AF2	F	89	94	Right-handed alpha
Helix 48	AF3	F	115	124	Right-handed alpha
Helix 49	AF4	F	157	183	Right-handed alpha
Helix 50	AF5	F	213	224	Right-handed alpha
Helix 51	AF6	F	289	297	Right-handed alpha
Helix 52	AF7	G	325	337	Right-handed alpha
Helix 53	AF8	G	353	358	Right-handed alpha
Helix 54	AF9	G	373	383	Right-handed alpha
Helix 55	AG1	G	394	401	Right-handed alpha
Helix 56	AG2	G	401	423	Right-handed alpha
Helix 57	AG3	G	461	482	Right-handed alpha
Helix 58	AG4	G	509	522	Right-handed alpha
Helix 59	AG5	G	528	531	Right-handed 310
Helix 60	AG6	G	540	553	Right-handed alpha
Helix 61	AG7	G	574	588	Right-handed alpha
Helix 62	AG8	G	590	594	Right-handed 310
Helix 63	AG9	G	623	631	Right-handed alpha
Helix 64	AH1	G	637	652	Right-handed alpha
Helix 65	AH2	H	325	338	Right-handed alpha
Helix 66	AH3	H	353	357	Right-handed 310
Helix 67	AH4	H	373	383	Right-handed alpha
Helix 68	AH5	H	394	401	Right-handed alpha
Helix 69	AH6	H	401	424	Right-handed alpha
Helix 70	AH7	H	432	436	Right-handed 310
Helix 71	AH8	H	461	482	Right-handed alpha
Helix 72	AH9	H	509	522	Right-handed alpha
Helix 73	AI1	H	530	532	Right-handed 310
Helix 74	AI2	H	539	553	Right-handed alpha
Helix 75	AI3	H	554	557	Right-handed 310
Helix 76	AI4	H	574	586	Right-handed alpha
Helix 77	AI5	H	587	594	Right-handed 310
Helix 78	AI6	H	623	631	Right-handed alpha
Helix 79	AI7	H	637	652	Right-handed alpha
Helix 80	AI8	I	325	337	Right-handed alpha
Helix 81	AI9	I	353	357	Right-handed 310
Helix 82	AJ1	I	373	383	Right-handed alpha
Helix 83	AJ2	I	394	401	Right-handed alpha
Helix 84	AJ3	I	401	410	Right-handed alpha
Helix 85	AJ4	I	410	424	Right-handed alpha
Helix 86	AJ5	I	432	436	Right-handed 310
Helix 87	AJ6	I	462	482	Right-handed alpha
Helix 88	AJ7	I	509	522	Right-handed alpha
Helix 89	AJ8	I	527	532	Right-handed 310
Helix 90	AJ9	I	540	553	Right-handed alpha
Helix 91	AK1	I	554	557	Right-handed 310
Helix 92	AK2	I	574	586	Right-handed alpha
Helix 93	AK3	I	590	594	Right-handed 310
Helix 94	AK4	I	623	630	Right-handed alpha
Helix 95	AK5	I	637	652	Right-handed alpha
Helix 96	AK6	J	325	336	Right-handed alpha
Helix 97	AK7	J	373	383	Right-handed alpha
Helix 98	AK8	J	396	401	Right-handed alpha
Helix 99	AK9	J	401	410	Right-handed alpha
Helix 100	AL1	J	410	424	Right-handed alpha
Helix 101	AL2	J	432	436	Right-handed 310
Helix 102	AL3	J	460	482	Right-handed alpha
Helix 103	AL4	J	509	522	Right-handed alpha
Helix 104	AL5	J	539	553	Right-handed alpha
Helix 105	AL6	J	554	557	Right-handed 310
Helix 106	AL7	J	574	587	Right-handed alpha
Helix 107	AL8	J	623	631	Right-handed alpha
Helix 108	AL9	J	637	652	Right-handed alpha
Helix 109	AM1	K	325	336	Right-handed alpha
Helix 110	AM2	K	350	354	Right-handed 310
Helix 111	AM3	K	373	383	Right-handed alpha
Helix 112	AM4	K	394	401	Right-handed alpha
Helix 113	AM5	K	401	423	Right-handed alpha
Helix 114	AM6	K	458	460	Right-handed 310
Helix 115	AM7	K	461	482	Right-handed alpha
Helix 116	AM8	K	509	522	Right-handed alpha
Helix 117	AM9	K	528	532	Right-handed 310
Helix 118	AN1	K	540	552	Right-handed alpha
Helix 119	AN2	K	553	557	Right-handed 310
Helix 120	AN3	K	567	569	Right-handed 310
Helix 121	AN4	K	574	586	Right-handed alpha
Helix 122	AN5	K	588	594	Right-handed 310
Helix 123	AN6	K	623	631	Right-handed alpha
Helix 124	AN7	K	637	652	Right-handed alpha
Helix 125	AN8	L	325	337	Right-handed alpha
Helix 126	AN9	L	353	357	Right-handed 310
Helix 127	AO1	L	373	383	Right-handed alpha
Helix 128	AO2	L	394	401	Right-handed alpha
Helix 129	AO3	L	401	423	Right-handed alpha
Helix 130	AO4	L	460	481	Right-handed alpha
Helix 131	AO5	L	509	522	Right-handed alpha
Helix 132	AO6	L	528	532	Right-handed 310
Helix 133	AO7	L	540	553	Right-handed alpha
Helix 134	AO8	L	554	557	Right-handed 310
Helix 135	AO9	L	574	586	Right-handed alpha
Helix 136	AP1	L	588	594	Right-handed 310
Helix 137	AP2	L	623	630	Right-handed alpha
Helix 138	AP3	L	638	652	Right-handed alpha

There are 43 sheets in PDB entry 21AK. 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,

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	3	5	first strand
Strand 2	A	26	29	parallel

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There are 4 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	79	82	first strand
Strand 2	A	100	104	parallel
Strand 3	A	131	133	anti-parallel
Strand 4	A	144	147	anti-parallel

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There are 4 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	231	235	first strand
Strand 2	A	238	248	anti-parallel
Strand 3	A	273	280	anti-parallel
Strand 4	A	266	268	anti-parallel

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There are 6 strands in AA4 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	25	29	first strand
Strand 2	B	2	7	parallel
Strand 3	B	78	82	parallel
Strand 4	B	100	104	parallel
Strand 5	B	127	134	anti-parallel
Strand 6	B	144	151	anti-parallel

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There are 4 strands in AA5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	231	235	first strand
Strand 2	B	238	248	anti-parallel
Strand 3	B	273	281	anti-parallel
Strand 4	B	266	268	anti-parallel

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There are 6 strands in AA6 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	26	30	first strand
Strand 2	C	3	7	parallel
Strand 3	C	78	82	parallel
Strand 4	C	99	104	parallel
Strand 5	C	128	134	anti-parallel
Strand 6	C	144	150	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	C	231	235	first strand
Strand 2	C	238	248	anti-parallel
Strand 3	C	273	280	anti-parallel
Strand 4	C	267	268	anti-parallel

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There are 4 strands in AA8 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	231	235	first strand
Strand 2	C	238	248	anti-parallel
Strand 3	C	273	280	anti-parallel
Strand 4	C	287	288	anti-parallel

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There are 6 strands in AA9 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	25	29	first strand
Strand 2	D	2	7	parallel
Strand 3	D	79	82	parallel
Strand 4	D	100	104	parallel
Strand 5	D	127	134	anti-parallel
Strand 6	D	144	151	anti-parallel

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There are 5 strands in AB1 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	231	235	first strand
Strand 2	D	238	248	anti-parallel
Strand 3	D	273	281	anti-parallel
Strand 4	D	266	268	anti-parallel
Strand 5	D	259	261	anti-parallel

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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	E	3	5	first strand
Strand 2	E	26	30	parallel
Strand 3	E	56	57	parallel

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There are 4 strands in AB3 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	79	82	first strand
Strand 2	E	100	104	parallel
Strand 3	E	131	134	anti-parallel
Strand 4	E	144	147	anti-parallel

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There are 2 strands in AB4 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	231	235	first strand
Strand 2	E	238	242	anti-parallel

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There are 4 strands in AB5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	244	248	first strand
Strand 2	E	273	278	anti-parallel
Strand 3	E	266	268	anti-parallel
Strand 4	E	259	261	anti-parallel

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There are 6 strands in AB6 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	26	29	first strand
Strand 2	F	3	7	parallel
Strand 3	F	79	82	parallel
Strand 4	F	100	104	parallel
Strand 5	F	128	134	anti-parallel
Strand 6	F	144	150	anti-parallel

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There are 4 strands in AB7 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	231	235	first strand
Strand 2	F	238	248	anti-parallel
Strand 3	F	273	280	anti-parallel
Strand 4	F	267	268	anti-parallel

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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	F	231	235	first strand
Strand 2	F	238	248	anti-parallel
Strand 3	F	273	280	anti-parallel
Strand 4	F	287	288	anti-parallel

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There are 4 strands in AB9 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	343	346	first strand
Strand 2	G	318	321	parallel
Strand 3	G	385	388	parallel
Strand 4	G	426	427	parallel

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There are 2 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	451	452	first strand
Strand 2	K	450	451	anti-parallel

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There are 2 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	488	489	first strand
Strand 2	G	563	564	parallel

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There are 2 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	525	527	first strand
Strand 2	G	600	602	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	G	534	535	first strand
Strand 2	G	572	573	anti-parallel

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There are 3 strands in AC5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	318	321	first strand
Strand 2	H	385	388	parallel
Strand 3	H	426	427	parallel

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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	H	346	347	first strand
Strand 2	H	365	366	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	H	451	453	first strand
Strand 2	J	451	453	anti-parallel

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There are 2 strands in AC8 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	486	489	first strand
Strand 2	H	561	564	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	H	525	528	first strand
Strand 2	H	600	603	parallel

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There are 2 strands in AD1 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	534	535	first strand
Strand 2	H	572	573	anti-parallel

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There are 7 strands in AD2 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	I	362	366	first strand
Strand 2	I	343	347	parallel
Strand 3	I	318	321	parallel
Strand 4	I	385	386	parallel
Strand 5	I	426	430	parallel
Strand 6	I	485	490	parallel
Strand 7	I	561	565	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	I	493	494	first strand
Strand 2	I	538	539	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	I	534	535	first strand
Strand 2	I	572	573	anti-parallel

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There are 5 strands in AD5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	J	318	321	first strand
Strand 2	J	385	388	parallel
Strand 3	J	426	430	parallel
Strand 4	J	485	490	parallel
Strand 5	J	561	565	parallel

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There are 2 strands in AD6 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	J	526	528	first strand
Strand 2	J	601	603	parallel

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There are 2 strands in AD7 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	J	534	535	first strand
Strand 2	J	572	573	anti-parallel

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There are 5 strands in AD8 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	K	362	366	first strand
Strand 2	K	343	347	parallel
Strand 3	K	318	321	parallel
Strand 4	K	385	388	parallel
Strand 5	K	426	427	parallel

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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	K	486	490	first strand
Strand 2	K	561	565	parallel

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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	K	525	527	first strand
Strand 2	K	600	602	parallel

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There are 2 strands in AE2 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	K	534	536	first strand
Strand 2	K	571	573	anti-parallel

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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	L	362	366	first strand
Strand 2	L	343	347	parallel
Strand 3	L	318	321	parallel
Strand 4	L	385	388	parallel
Strand 5	L	426	427	parallel

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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	L	486	489	first strand
Strand 2	L	561	564	parallel

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There are 2 strands in AE5 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	L	493	494	first strand
Strand 2	L	538	539	parallel

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There are 2 strands in AE6 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	L	525	526	first strand
Strand 2	L	600	601	parallel

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There are 2 strands in AE7 sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	L	534	535	first strand
Strand 2	L	572	573	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: 21AK

Analysis of interatomic Contacts of Structural Units in PDB entry:
21AK