3T3P: Integrin alpha-IIb

A Novel High Affinity Integrin alphaIIbbeta3 Receptor Antagonist That Unexpectedly Displaces Mg2+ from the beta3 MIDAS. Determined by X-ray diffraction at 2.2 Å resolution. Released 28 Mar 2012.

Method: X-ray diffraction
Resolution: 2.2 Å
Organisms: Homo sapiens, Mus musculus
Chains: 8
Atoms: 22,411
Mol. weight: 301.79 kDa
Ligands: NAG, MG, CA
Released: 28 Mar 2012

Explore 3T3P in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

3T3P contains 94 α-helices and 241 β-strands across 8 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chain A: 10 helices, 45 β-strands

Element	Residues	Length	Sheet
β-strand	3	1	1
β-strand	9-12	4	2
β-strand	22-27	6	3
β-strand	33-39	7	3
β-strand	43	1	4
β-strand	49	1	4
β-strand	51	1	5
β-strand	52-57	6	3
β-strand	63	1	2
β-strand	67-68	2	3
β-strand	76-79	4	6
β-strand	82-87	6	6
β-strand	93	1	5
β-strand	96-100	5	7
β-strand	103-108	6	7
β-strand	112-117	6	6
β-strand	120-121	2	6
β-strand	125	1	6
β-strand	129-134	6	7
β-strand	139-143	5	7
α-helix	152-157	6
β-strand	172-175	4	8
β-strand	180-185	6	8
α-helix	188-191	4
β-strand	194-199	6	8
α-helix	200-206	7
β-strand	214	1	9
β-strand	220-221	2	8
α-helix	228-230	3
β-strand	238-242	5	10
α-helix	251	1
β-strand	252-257	6	10
α-helix	260-263	4
β-strand	266-270	5	10
β-strand	276-281	6	10
α-helix	282	1
β-strand	292-296	5	11
β-strand	305-310	6	11
β-strand	314-317	4	12
β-strand	321-324	4	12
β-strand	327-331	5	11
α-helix	332-334	3
β-strand	345-348	4	11
β-strand	359-364	6	13
β-strand	373-378	6	13
β-strand	388-392	5	13
β-strand	394-395	2	14
β-strand	398-399	2	14
β-strand	405-408	4	13
α-helix	412	1
β-strand	420-425	6	2
β-strand	434-439	6	2
α-helix	440-442	3
β-strand	444-448	5	2
β-strand	450	1	1

Chain B: 22 helices, 29 β-strands

Element	Residues	Length	Sheet
α-helix	4-7	4
α-helix	13-19	7
β-strand	23-26	4	15
β-strand	38-40	3	15
α-helix	41-46	6
α-helix	51-53	3
β-strand	54-55	2	15
β-strand	60-65	6	16
α-helix	67-70	4
β-strand	83-84	2	17
β-strand	87-92	6	16
β-strand	97-105	9	17
β-strand	112-119	8	18
α-helix	122-124	3
α-helix	125-130	6
α-helix	134-142	9
β-strand	149-156	8	18
α-helix	170-174	5
α-helix	185-187	3
β-strand	190-197	8	18
α-helix	200-209	10
β-strand	220	1	19
α-helix	222-231	10
α-helix	233-236	4
β-strand	243-250	8	18
β-strand	254	1	19
α-helix	259-263	5
α-helix	267-269	3
β-strand	275	1	20
β-strand	280	1	18
β-strand	281	1	20
α-helix	288-291	4
α-helix	292-301	10
β-strand	305-310	6	18
α-helix	312-314	3
α-helix	315-323	9
β-strand	329-332	4	18
α-helix	333-334	2
α-helix	340-351	12
β-strand	355-356	2	21
β-strand	357-360	4	16
β-strand	366-374	9	17
β-strand	378-381	4	17
β-strand	385-386	2	21
β-strand	394-403	10	17
β-strand	411-418	8	16
β-strand	425-431	7	16
α-helix	436-440	5
β-strand	442	1	22
β-strand	453-456	4	22
β-strand	459-462	4	22

Chain C: 10 helices, 45 β-strands

Element	Residues	Length	Sheet
β-strand	3	1	23
β-strand	9-12	4	24
β-strand	22-27	6	25
β-strand	33-39	7	25
β-strand	43	1	26
β-strand	49	1	26
β-strand	51	1	27
β-strand	52-57	6	25
β-strand	63	1	24
β-strand	67	1	25
β-strand	76-79	4	28
β-strand	82-87	6	28
β-strand	93	1	27
β-strand	96-100	5	29
β-strand	103-108	6	29
β-strand	112-117	6	28
β-strand	120-121	2	28
β-strand	125	1	28
β-strand	129-134	6	29
β-strand	139-143	5	29
α-helix	152-157	6
β-strand	172-175	4	30
β-strand	180-185	6	30
α-helix	188-191	4
β-strand	194-199	6	30
α-helix	200-206	7
β-strand	214	1	31
β-strand	220-221	2	30
α-helix	228-230	3
β-strand	238-242	5	32
β-strand	252-257	6	32
α-helix	260-263	4
β-strand	266-270	5	32
β-strand	276-281	6	32
β-strand	292-296	5	33
β-strand	305-310	6	33
α-helix	313	1
β-strand	314-317	4	34
β-strand	321-324	4	34
β-strand	327-331	5	33
α-helix	332-334	3
α-helix	338-340	3
β-strand	345-348	4	33
β-strand	359-364	6	35
β-strand	373-378	6	35
β-strand	388-392	5	35
β-strand	394-395	2	36
β-strand	398-399	2	36
β-strand	405-408	4	35
α-helix	412	1
β-strand	420-425	6	24
β-strand	434-439	6	24
α-helix	440-442	3
β-strand	444-448	5	24
β-strand	450	1	23

Chain D: 24 helices, 31 β-strands

Element	Residues	Length	Sheet
α-helix	4-7	4
α-helix	13-17	5
β-strand	23-26	4	37
β-strand	38-40	3	37
α-helix	41-46	6
α-helix	51-53	3
β-strand	54-55	2	37
β-strand	60-65	6	38
α-helix	67-70	4
β-strand	72	1	39
α-helix	77-79	3
β-strand	83-84	2	40
β-strand	87-92	6	38
β-strand	97-105	9	40
β-strand	108	1	39
β-strand	112-119	8	41
α-helix	122-124	3
α-helix	125-131	7
α-helix	134-142	9
β-strand	149-156	8	41
α-helix	170-174	5
α-helix	185-187	3
β-strand	190-197	8	41
α-helix	200-209	10
β-strand	220	1	42
α-helix	222-231	10
α-helix	233-236	4
β-strand	243-250	8	41
β-strand	254	1	42
α-helix	259-263	5
α-helix	268-269	2
β-strand	275	1	43
β-strand	280	1	41
β-strand	281	1	43
α-helix	288-291	4
α-helix	292-301	10
β-strand	305-311	7	41
α-helix	312-314	3
α-helix	315-322	8
β-strand	329-333	5	41
α-helix	334	1
α-helix	340-351	12
β-strand	355-356	2	44
β-strand	357-360	4	38
β-strand	366-373	8	40
β-strand	379-381	3	40
β-strand	385-386	2	44
β-strand	394-403	10	40
β-strand	411-418	8	38
β-strand	425-431	7	38
α-helix	436-440	5
β-strand	442	1	45
β-strand	453-456	4	45
β-strand	459-462	4	45
α-helix	463	1

Chain E: 6 helices, 24 β-strands

Element	Residues	Length	Sheet
β-strand	3-6	4	46
β-strand	10-12	3	47
β-strand	18-25	8	46
β-strand	34-40	7	47
β-strand	44-52	9	47
β-strand	57-60	4	47
α-helix	62-64	3
β-strand	68-73	6	46
β-strand	78-83	6	46
α-helix	88-90	3
β-strand	92-98	7	47
β-strand	102	1	31
β-strand	108-109	2	47
β-strand	113-117	5	47
α-helix	120-122	3
β-strand	123	1	48
α-helix	124-125	2
β-strand	126-130	5	49
β-strand	141-149	9	49
β-strand	152	1	48
β-strand	157-160	4	50
β-strand	169-171	3	49
α-helix	172-174	3
β-strand	175-177	3	49
β-strand	180-190	11	49
β-strand	200-204	5	50
β-strand	205	1	51
α-helix	206-208	3
β-strand	210	1	51
β-strand	213-215	3	50

Chain F: 7 helices, 23 β-strands

Element	Residues	Length	Sheet
β-strand	4-7	4	52
β-strand	10-13	4	53
β-strand	19-25	7	52
β-strand	33-38	6	53
β-strand	44-49	6	53
β-strand	53-54	2	53
α-helix	55	1
β-strand	62-67	6	52
β-strand	70-75	6	52
α-helix	80-82	3
β-strand	85-90	6	53
α-helix	96	1
β-strand	97-98	2	53
β-strand	102-106	5	53
β-strand	111	1	54
β-strand	114-118	5	55
α-helix	119-121	3
α-helix	122-126	5
β-strand	129-139	11	55
β-strand	140	1	54
β-strand	145-150	6	56
β-strand	153-155	3	56
β-strand	159-163	5	55
α-helix	165-167	3
β-strand	173-182	10	55
α-helix	183-186	4
β-strand	191	1	57
β-strand	192-197	6	56
β-strand	205	1	56
β-strand	210	1	57

Chain H: 8 helices, 23 β-strands

Element	Residues	Length	Sheet
β-strand	3-6	4	58
β-strand	10-12	3	59
β-strand	18-25	8	58
α-helix	29-31	3
β-strand	34-40	7	59
β-strand	44-52	9	59
β-strand	57-60	4	59
α-helix	62-64	3
β-strand	68-73	6	58
α-helix	74-76	3
β-strand	78-83	6	58
α-helix	88-90	3
β-strand	92-98	7	59
β-strand	102	1	9
β-strand	108-109	2	59
β-strand	113-117	5	59
β-strand	123	1	60
α-helix	124-125	2
β-strand	126-130	5	61
β-strand	141-151	11	61
β-strand	152	1	60
β-strand	157-160	4	62
β-strand	165	1	62
β-strand	169-171	3	61
α-helix	172-174	3
β-strand	175-177	3	61
β-strand	180-190	11	61
β-strand	200-205	6	62
α-helix	206-208	3
β-strand	210-215	6	62
α-helix	216	1

Chain L: 7 helices, 21 β-strands

Element	Residues	Length	Sheet
β-strand	4-7	4	63
β-strand	10-13	4	64
β-strand	19-25	7	63
β-strand	33-38	6	64
β-strand	44-49	6	64
β-strand	53-54	2	64
α-helix	55	1
β-strand	62-67	6	63
β-strand	70-75	6	63
α-helix	80-82	3
β-strand	85-90	6	64
α-helix	96	1
β-strand	97-98	2	64
β-strand	102-106	5	64
β-strand	111	1	65
β-strand	114-118	5	66
α-helix	119-121	3
α-helix	122-127	6
β-strand	129-139	11	66
β-strand	140	1	65
β-strand	145-150	6	67
β-strand	153-155	3	67
β-strand	159-163	5	66
β-strand	173-182	10	66
α-helix	183-187	5
β-strand	191-197	7	67
α-helix	204	1
β-strand	205-210	6	67

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Integrin alpha-IIb	A, C	protein	457	Homo sapiens	P08514 (AlphaFold model)
Integrin beta-3	B, D	protein	472	Homo sapiens	P05106 (AlphaFold model)
Monoclonal antibody 10E5 heavy chain	E, H	protein	221	Mus musculus
Monoclonal antibody 10E5 light chain	F, L	protein	214	Mus musculus

Sequence of entity 1 (A, C), FASTA

>3T3P_1 Integrin alpha-IIb (chains A, C)
LNLDPVQLTFYAGPNGSQFGFSLDFHKDSHGRVAIVVGAPRTLGPSQEETGGVFLCPWRA
EGGQCPSLLFDLRDETRNVGSQTLQTFKARQGLGASVVSWSDVIVACAPWQHWNVLEKTE
EAEKTPVGSCFLAQPESGRRAEYSPCRGNTLSRIYVENDFSWDKRYCEAGFSSVVTQAGE
LVLGAPGGYYFLGLLAQAPVADIFSSYRPGILLWHVSSQSLSFDSSNPEYFDGYWGYSVA
VGEFDGDLNTTEYVVGAPTWSWTLGAVEILDSYYQRLHRLRGEQMASYFGHSVAVTDVNG
DGRHDLLVGAPLYMESRADRKLAEVGRVYLFLQPRGPHALGAPSLLLTGTQLYGRFGSAI
APLGDLDRDGYNDIAVAAPYGGPSGRGQVLVFLGQSEGLRSRPSQVLDSPFPTGSAFGFS
LRGAVDIDDNGYPDLIVGAYGANQVAVYRAQPVVKAS

Sequence of entity 2 (B, D), FASTA

>3T3P_2 Integrin beta-3 (chains B, D)
GPNICTTRGVSSCQQCLAVSPMCAWCSDEALPLGSPRCDLKENLLKDNCAPESIEFPVSE
ARVLEDRPLSDKGSGDSSQVTQVSPQRIALRLRPDDSKNFSIQVRQVEDYPVDIYYLMDL
SYSMKDDLWSIQNLGTKLATQMRKLTSNLRIGFGAFVDKPVSPYMYISPPEALENPCYDM
KTTCLPMFGYKHVLTLTDQVTRFNEEVKKQSVSRNRDAPEGGFDAIMQATVCDEKIGWRN
DASHLLVFTTDAKTHIALDGRLAGIVQPNDGQCHVGSDNHYSASTTMDYPSLGLMTEKLS
QKNINLIFAVTENVVNLYQNYSELIPGTTVGVLSMDSSNVLQLIVDAYGKIRSKVELEVR
DLPEELSLSFNATCLNNEVIPGLKSCMGLKIGDTVSFSIEAKVRGCPQEKEKSFTIKPVG
FKDSLIVQVTFDCDCACQAQAEPNSHRCNNGNGTFECGVCRCGPGWLGSQCE

Sequence of entity 3 (E, H), FASTA

>3T3P_3 Monoclonal antibody 10E5 heavy chain (chains E, H)
EVQLQQSGAELVKPGASVKLSCTASGFNIKDTYVHWVKQRPEQGLEWIGRIDPANGYTKY
DPKFQGKATITADTSSNTAYLQLSSLTSEDTAVYYCVRPLYDYYAMDYWGQGTSVTVSSA
KTTAPSVYPLAPVCGDTTGSSVTLGCLVKGYFPEPVTLTWNSGSLSSGVHTFPAVLQSDL
YTLSSSVTVTSSTWPSQSITCNVAHPASSTKVDKKIEPRGP

Sequence of entity 4 (F, L), FASTA

>3T3P_4 Monoclonal antibody 10E5 light chain (chains F, L)
DILMTQSPSSMSVSLGDTVSITCHASQGISSNIGWLQQKPGKSFMGLIYYGTNLVDGVPS
RFSGSGSGADYSLTISSLDSEDFADYYCVQYAQLPYTFGGGTKLEIKRADAAPTVSIFPP
SSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLT
LTKDEYERHNSYTCEATHKTSTSPIVKSFNRNEC

Ligands and cofactors

ID	Name	Formula	Copies
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	C8 H15 N O6	2
MG	Magnesium ion	Mg	2
CA	Calcium ion	Ca	12

Water and common crystallization additives (GOL, SO4, CL) are not listed.

Primary citation

Structure-Guided Design of a High-Affinity Platelet Integrin alphaIIbbeta3 Receptor Antagonist That Disrupts Mg2+ Binding to the MIDAS. Zhu, J., Choi, W.S., McCoy, J.G. et al. Sci Transl Med (2012) 4:125ra32-125ra32. DOI 10.1126/scitranslmed.3003576 · PubMed

Other PDB entries of the same protein (UniProt P08514 (AlphaFold model), which also has an AlphaFold model), best resolution first:

7SC4 1.85 Å, filamin complex-1
7UDH 2.0 Å, Integrin alpha IIB beta3 complex with BMS4-3
7UBR 2.05 Å, Integrin alpha IIB beta3 complex with GR144053
7TMZ 2.2 Å, Integrin alpha IIB beta3 complex with BMS compound 4
3NIG 2.25 Å, The Closed Headpiece of Integrin IIb 3 and its Complex with an IIb 3 -Specific…
7U9V 2.25 Å, Integrin alpha IIB beta3 complex with BMS4-1
3NID 2.3 Å, The Closed Headpiece of Integrin alphaIIB beta3 and its Complex with an alpahIIB beta3…
7L8P 2.35 Å, Integrin alphaIIbbeta3 in complex with sibrafiban
7UCY 2.35 Å, Integrin alpha IIB beta3 complex with gantofiban
3ZE2 2.35 Å, Integrin alphaIIB beta3 headpiece and RGD peptide complex
7UKT 2.37 Å, Integrin alpha IIB beta3 complex with BMS4.2
2VDR 2.4 Å, Integrin AlphaIIbBeta3 Headpiece Bound to a chimeric Fibrinogen Gamma chain peptide,…

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