1mxl

STRUCTURE OF CARDIAC TROPONIN C-TROPONIN I COMPLEX

Method: SOLUTION NMR

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1. Protein Identity and Related Structures Protein Identity & Related Structures

PROTEIN (TROPONIN C)

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	PROTEIN (TROPONIN I) × 1 （P19429） CALCIUM ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TNNC1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain C； PDBConstruct 1–89； UniProt 1–89

PROTEIN (TROPONIN I)

OrganismNot specified

UniProt P19429

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	PROTEIN (TROPONIN C) × 1 （P63316） CALCIUM ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TNNI3_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain I； PDBConstruct 1–17； UniProt 147–163

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	1mxl
Deposition date deposition_date	1999-04-22
Structure title title	STRUCTURE OF CARDIAC TROPONIN C-TROPONIN I COMPLEX
Keywords keywords	TROPONIN, MUSCLE CONTRACTION, REGULATORY PROTEIN, CALCIUM-BINDING PROTEIN; CALCIUM-BINDING PROTEIN
Experimental Method method	SOLUTION NMR

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

1mxl__assembly_1__model_28

Assembly 1 · Model 28 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1mxl__assembly_1__model_28 | I(q)

100 plotted points; both axes use logarithmic scales.

1mxl__assembly_1__model_28 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	15.38 Å
Rg (electron density)	13.81 Å
Total Rg	15.04 Å
Atom count	1626
Residues	106
Excluded volume	14649 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1mxl__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	2	`1mxl__assembly_1__model_2`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	3	`1mxl__assembly_1__model_3`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	4	`1mxl__assembly_1__model_4`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	5	`1mxl__assembly_1__model_5`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	6	`1mxl__assembly_1__model_6`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	7	`1mxl__assembly_1__model_7`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	8	`1mxl__assembly_1__model_8`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	9	`1mxl__assembly_1__model_9`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	10	`1mxl__assembly_1__model_10`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	11	`1mxl__assembly_1__model_11`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	12	`1mxl__assembly_1__model_12`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	13	`1mxl__assembly_1__model_13`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	14	`1mxl__assembly_1__model_14`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	15	`1mxl__assembly_1__model_15`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	16	`1mxl__assembly_1__model_16`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	17	`1mxl__assembly_1__model_17`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	18	`1mxl__assembly_1__model_18`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	19	`1mxl__assembly_1__model_19`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	20	`1mxl__assembly_1__model_20`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	21	`1mxl__assembly_1__model_21`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	22	`1mxl__assembly_1__model_22`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	23	`1mxl__assembly_1__model_23`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	24	`1mxl__assembly_1__model_24`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	25	`1mxl__assembly_1__model_25`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	26	`1mxl__assembly_1__model_26`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	27	`1mxl__assembly_1__model_27`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	28	`1mxl__assembly_1__model_28`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	29	`1mxl__assembly_1__model_29`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	30	`1mxl__assembly_1__model_30`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	31	`1mxl__assembly_1__model_31`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	32	`1mxl__assembly_1__model_32`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	33	`1mxl__assembly_1__model_33`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	34	`1mxl__assembly_1__model_34`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	35	`1mxl__assembly_1__model_35`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	36	`1mxl__assembly_1__model_36`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	37	`1mxl__assembly_1__model_37`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	38	`1mxl__assembly_1__model_38`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	39	`1mxl__assembly_1__model_39`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	40	`1mxl__assembly_1__model_40`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Description description	PROTEIN (TROPONIN C)
Molecular weight formula_weight	10070.3 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C
Atom count atom_count	65040

MDDIYKAAVEQLTEEQKNEFKAAFDIFVLGAEDGCISTKELGKVMRMLGQNPTPEELQEMIDEVDEDGSGTVDFDEFLVMMVRCMKDDS

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	PROTEIN (TROPONIN I)
Molecular weight formula_weight	1806.2 kDa
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I

RISADAMMQALLGARAK

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

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6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1mxlc_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

Domain ID domain_id	d1mxli_
Class class	j — Peptides
Fold Fold fold	j.22 — Troponin I fragments
Superfamily Superfamily superfamily	j.22.1 — Troponin I fragments
Family Family family	j.22.1.1 — Troponin I fragments

CATH v4.4 (1 domains)

Domain ID domain_id	1mxlC00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	1

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

STRUCTURE OF CARDIAC TROPONIN C-TROPONIN I COMPLEX

1. Protein Identity and Related Structures Protein Identity & Related Structures

PROTEIN (TROPONIN C)

State in the Current Structure

Other States of the Same Protein in the Database

PROTEIN (TROPONIN I)

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1mxl__assembly_1__model_28

1mxl__assembly_1__model_28 | I(q)

1mxl__assembly_1__model_28 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (2 domains)

CATH v4.4 (1 domains)

7. Citations (1)

STRUCTURE OF CARDIAC TROPONIN C-TROPONIN I COMPLEX

1. Protein Identity and Related Structures Protein Identity & Related Structures

PROTEIN (TROPONIN C)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

PROTEIN (TROPONIN I)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1mxl__assembly_1__model_28

1mxl__assembly_1__model_28 | I(q)

1mxl__assembly_1__model_28 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (2 domains)

CATH v4.4 (1 domains)

7. Citations (1)