SAXSdb — 1l9a

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

SIGNAL RECOGNITION PARTICLE 19 KDA PROTEIN

Methanocaldococcus jannaschii

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–RNA	Monomer	Protein 1 RNA 1	signal recognition particle RNA S domain × 1 MAGNESIUM ION × 24 METHYL MERCURY ION × 1 water × 2	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SRP19_METJA
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain A； PDBConstruct 1–87； UniProt 1–87

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	1l9a
Deposition date deposition_date	2002-03-22
Structure title title	CRYSTAL STRUCTURE OF SRP19 IN COMPLEX WITH THE S DOMAIN OF SIGNAL RECOGNITION PARTICLE RNA
Keywords keywords	PROTEIN-RNA COMPLEX, RIBONUCLEOPROTEIN, SRP, SIGNAL RECOGNITION PARTICLE, TETRALOOP, SIGNALING PROTEIN-RNA COMPLEX; SIGNALING PROTEIN/RNA
Experimental Method method	X-RAY DIFFRACTION

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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.

1l9a__assembly_1__model_1

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

Download this curve (.dat)

1l9a__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1l9a__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	32.75 Å
Rg (electron density)	34.24 Å
Total Rg	34.32 Å
Atom count	3459
Residues	212
Excluded volume	52010 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1l9a__assembly_1__model_1`	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 (5)

Entity 1 Entity 1 polymer

Description description	signal recognition particle RNA S domain
Molecular weight formula_weight	41566.7 kDa
Mutation mutation	C112G, G113A, G238U, G239C
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polyribonucleotide
Chain IDs strand_id	B
Atom count atom_count	3489

GACACUAAGUUCGGCAUCAAUAUGGUGACCUCCCGGGAGCGGGGGACCACCAGGUUGCCUAAGGAGGGGUGAACCGGCCCAGGUCGGAAACGGAGCAGGUCAAAACUCCCGUGCUGAUCAGUAGUGUC

Entity 2 Entity 2 polymer

Description description	SIGNAL RECOGNITION PARTICLE 19 KDA PROTEIN
Molecular weight formula_weight	10341.3 kDa
Mutation mutation	C61A, C63R, C80A, Q74C
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A

MIIWPSYIDKKKSRREGRKVPEELAIEKPSLKDIEKALKKLGLEPKIYRDKRYPRQHWEIAGRVEVDYKGNKLCLLKEIAKIIKGKN

Source Source

Source organism organism	Methanocaldococcus jannaschii
NCBI taxonomy ID ncbi_taxonomy_id	2190
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	24

Entity 4 Entity 4 non-polymer

Description description	METHYL MERCURY ION
Molecular weight formula_weight	215.6 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	30

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1l9aa_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.201 — SRP19
Superfamily Superfamily superfamily	d.201.1 — SRP19
Family Family family	d.201.1.1 — SRP19

CATH v4.4 (1 domains)

Domain ID domain_id	1l9aA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	56 — Phenylalanyl-tRNA Synthetase; Chain B, domain 1
Homologous superfamily homologous superfamily	30 — Signal recognition particle, SRP19-like subunit

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Unit-cell length a length_a	70.765 Å
Unit-cell length b length_b	223.875 Å
Unit-cell length c length_c	43.024 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	4

Space group space_group	P 21 21 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.900 Å
Low-resolution limit resolution_low	37.840 Å
R factor r_factor	0.2640
R_work r_work	0.2640
R_free r_free	0.2960

CRYSTAL STRUCTURE OF SRP19 IN COMPLEX WITH THE S DOMAIN OF SIGNAL RECOGNITION PARTICLE RNA

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

SIGNAL RECOGNITION PARTICLE 19 KDA PROTEIN

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

1l9a__assembly_1__model_1

1l9a__assembly_1__model_1 | I(q)

1l9a__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)

CRYSTAL STRUCTURE OF SRP19 IN COMPLEX WITH THE S DOMAIN OF SIGNAL RECOGNITION PARTICLE RNA

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

SIGNAL RECOGNITION PARTICLE 19 KDA PROTEIN

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

1l9a__assembly_1__model_1

1l9a__assembly_1__model_1 | I(q)

1l9a__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)