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

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 21LT entry

There are 7 chains in PDB entry 21LT (CSU analysis of residue contacts immediately below table)

Chain ID	Initial residue	Terminal residue
P	ARG 1	CYS 2
P	HIS 4	HIS 4
P	ARG 6	CYS 8
R	CYS 40	ILE 316
A	LEU 5	VAL 361
B	ASP 5	ASN 340
G	ALA 12	PHE 61

There are 25 helices in PDB entry 21LT. Click on helix of interest for CSU analysis.

Helix number	Helix ID	Chain ID	Initial residue	Terminal residue	Helix class
Helix 1	AA1	R	47	71	Right-handed alpha
Helix 2	AA2	R	77	106	Right-handed alpha
Helix 3	AA3	R	118	153	Right-handed alpha
Helix 4	AA4	R	156	161	Right-handed alpha
Helix 5	AA5	R	162	187	Right-handed alpha
Helix 6	AA6	R	190	227	Right-handed alpha
Helix 7	AA7	R	241	270	Right-handed alpha
Helix 8	AA8	R	280	282	Right-handed 310
Helix 9	AA9	R	283	303	Right-handed alpha
Helix 10	AB1	R	306	315	Right-handed alpha
Helix 11	AB2	A	6	33	Right-handed alpha
Helix 12	AB3	A	45	57	Right-handed alpha
Helix 13	AB4	A	210	216	Right-handed 310
Helix 14	AB5	A	232	245	Right-handed alpha
Helix 15	AB6	A	246	250	Right-handed 310
Helix 16	AB7	A	260	271	Right-handed alpha
Helix 17	AB8	A	274	279	Right-handed alpha
Helix 18	AB9	A	280	283	Right-handed 310
Helix 19	AC1	A	298	318	Right-handed alpha
Helix 20	AC2	A	337	359	Right-handed alpha
Helix 21	AC3	B	6	26	Right-handed alpha
Helix 22	AC4	B	29	34	Right-handed alpha
Helix 23	AC5	B	35	37	Right-handed 310
Helix 24	AC6	G	13	24	Right-handed alpha
Helix 25	AC7	G	29	44	Right-handed alpha

There are 8 sheets in PDB entry 21LT. Click on sheet of interest to get list of strands forming it: AA1, AA2, AA3, AA4, AA5, AA6, AA7, AA8,

There are 6 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	184	191	first strand
Strand 2	A	194	201	anti-parallel
Strand 3	A	34	39	parallel
Strand 4	A	220	226	parallel
Strand 5	A	253	259	parallel
Strand 6	A	326	329	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	B	47	51	first strand
Strand 2	B	336	339	anti-parallel
Strand 3	B	327	331	anti-parallel
Strand 4	B	315	320	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	B	58	63	first strand
Strand 2	B	69	74	anti-parallel
Strand 3	B	78	83	anti-parallel
Strand 4	B	89	94	anti-parallel

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There are 4 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	100	105	first strand
Strand 2	B	111	116	anti-parallel
Strand 3	B	121	125	anti-parallel
Strand 4	B	134	139	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	146	153	first strand
Strand 2	B	156	161	anti-parallel
Strand 3	B	166	170	anti-parallel
Strand 4	B	175	180	anti-parallel

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There are 4 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	187	192	first strand
Strand 2	B	198	203	anti-parallel
Strand 3	B	208	212	anti-parallel
Strand 4	B	218	222	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	B	229	234	first strand
Strand 2	B	240	245	anti-parallel
Strand 3	B	249	254	anti-parallel
Strand 4	B	259	264	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	B	273	278	first strand
Strand 2	B	284	289	anti-parallel
Strand 3	B	294	298	anti-parallel
Strand 4	B	304	307	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: 21LT

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