SAXSdb — 1sqs

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

conserved hypothetical protein

Streptococcus pneumoniae

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	L(+)-TARTARIC ACID × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q97NR6_STRPN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–234； UniProt 1–234 Author chain B； PDBConstruct 1–234； UniProt 1–234

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	1sqs
Deposition date deposition_date	2004-03-19
Structure title title	X-Ray Crystal Structure Protein SP1951 of Streptococcus pneumoniae. Northeast Structural Genomics Consortium Target SpR27.
Keywords keywords	;structural genomics, alpha beta protein, PSI, Protein Structure Initiative, Northeast Structural Genomics Consortium, NESG, UNKNOWN FUNCTION ;; STRUCTURAL GENOMICS, UNKNOWN FUNCTION
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.

1sqs__assembly_1__model_1

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

Download this curve (.dat)

1sqs__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1sqs__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	24.99 Å
Rg (electron density)	23.83 Å
Total Rg	24.87 Å
Atom count	3806
Residues	456
Excluded volume	67656 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1sqs__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 (3)

Entity 1 Entity 1 polymer

Description description	conserved hypothetical protein
Molecular weight formula_weight	28439.3 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	4342

MNKIFIYAGVRNHNSKTLEYTKRLSSIISSRNNVDISFRTPFNSELEISNSDSEELFKKGIDRQSNADDGGVIKKELLESDIIIISSPVYLQNVSVDTKNFIERIGGWSHLFRLAGKFVVTLDVAESNGSDNVSEYLRDIFSYMGGQILHQVSITNSLKDIAEAQLMEATYKIEDVLEGKIKYKTTDYQERAYQTLKLILENYDSEHFEKMYWEKKRLFEANSLEEWYYVENIKLEHHHHHH

Source Source

Source organism organism	Streptococcus pneumoniae
NCBI taxonomy ID ncbi_taxonomy_id	170187
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	L(+)-TARTARIC ACID
Molecular weight formula_weight	150.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	536

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1sqsa_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.23 — Flavodoxin-like
Superfamily Superfamily superfamily	c.23.5 — Flavoproteins
Family Family family	c.23.5.5 — Hypothetical protein SP1951

Domain ID domain_id	d1sqsb_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.23 — Flavodoxin-like
Superfamily Superfamily superfamily	c.23.5 — Flavoproteins
Family Family family	c.23.5.5 — Hypothetical protein SP1951

CATH v4.4 (2 domains)

Domain ID domain_id	1sqsA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	360 — Flavodoxin domain

Domain ID domain_id	1sqsB00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	360 — Flavodoxin domain

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Unit-cell length a length_a	49.161 Å
Unit-cell length b length_b	81.994 Å
Unit-cell length c length_c	63.450 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	94.62 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.500 Å
Low-resolution limit resolution_low	28.760 Å
R factor r_factor	—
R_work r_work	0.2000
R_free r_free	0.2200

X-Ray Crystal Structure Protein SP1951 of Streptococcus pneumoniae. Northeast Structural Genomics Consortium Target SpR27.

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

conserved hypothetical 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

1sqs__assembly_1__model_1

1sqs__assembly_1__model_1 | I(q)

1sqs__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

X-Ray Crystal Structure Protein SP1951 of Streptococcus pneumoniae. Northeast Structural Genomics Consortium Target SpR27.

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

conserved hypothetical 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

1sqs__assembly_1__model_1

1sqs__assembly_1__model_1 | I(q)

1sqs__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)