SAXSdb — 3chf

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

Chitinase

Aspergillus fumigatus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Argifin × 1 SULFATE ION × 6 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Argifin × 1 SULFATE ION × 8 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q873X9_ASPFU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–433； UniProt 1–433 Author chain B； PDBConstruct 1–433； UniProt 1–433

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	3chf
Deposition date deposition_date	2008-03-09
Structure title title	Crystal structure of Aspergillus fumigatus chitinase B1 in complex with tetrapeptide
Keywords keywords	(beta-alpha)8 barrel, chitinase, peptide inhibitors, Glycosidase, HYDROLASE-HYDROLASE INHIBITOR complex; HYDROLASE/HYDROLASE INHIBITOR
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.

3chf__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3chf__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3chf__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	22.18 Å
Rg (electron density)	20.71 Å
Total Rg	21.67 Å
Atom count	3150
Residues	395
Excluded volume	55158 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3chf__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3chf__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Description description	Chitinase
Molecular weight formula_weight	47661.8 kDa
EC 编号 ec_number	3.2.1.14
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	7158

MRFATSTIVKVALLLSSLCVDAAVMWNRDTSSTDLEARASSGYRSVVYFVNWAIYGRNHNPQDLPVERLTHVLYAFANVRPETGEVYMTDSWADIEKHYPGDSWSDTGNNVYGCIKQLYLLKKQNRNLKVLLSIGGWTYSPNFAPAASTDAGRKNFAKTAVKLLQDLGFDGLDIDWEYPENDQQANDFVLLLKEVRTALDSYSAANAGGQHFLLTVASPAGPDKIKVLHLKDMDQQLDFWNLMAYDYAGSFSSLSGHQANVYNDTSNPLSTPFNTQTALDLYRAGGVPANKIVLGMPLYGRSFANTDGPGKPYNGVGQGSWENGVWDYKALPQAGATEHVLPDIMASYSYDATNKFLISYDNPQVANLKSGYIKSLGLGGAMWWDSSSDKTGSDSLITTVVNALGGTGVFEQSQNELDYPVSQYDNLRNGMQT

Source Source

Source organism organism	Aspergillus fumigatus
NCBI taxonomy ID ncbi_taxonomy_id	5085
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 polymer

Description description	Argifin
Molecular weight formula_weight	604.7 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,D

XAXFD

Entity 3 Entity 3 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	14

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	842

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d3chfa1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.5 — Type II chitinase

Domain ID domain_id	d3chfa2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.26 — FKBP-like
Superfamily Superfamily superfamily	d.26.3 — Chitinase insertion domain
Family Family family	d.26.3.1 — Chitinase insertion domain

Domain ID domain_id	d3chfb1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.5 — Type II chitinase

Domain ID domain_id	d3chfb2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.26 — FKBP-like
Superfamily Superfamily superfamily	d.26.3 — Chitinase insertion domain
Family Family family	d.26.3.1 — Chitinase insertion domain

CATH v4.4 (4 domains)

Domain ID domain_id	3chfA01
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	3chfA02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	50 — Chitinase A; domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3chfB01
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	3chfB02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	50 — Chitinase A; domain 3
Homologous superfamily homologous superfamily	10 —

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Unit-cell length a length_a	117.060 Å
Unit-cell length b length_b	117.060 Å
Unit-cell length c length_c	99.748 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	8

Space group space_group	P 41
Space-group number int_tables_number	76
Crystal system crystal_system	—

Resolution resolution	1.950 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.1760
R_work r_work	0.1760
R_free r_free	0.1970

Crystal structure of Aspergillus fumigatus chitinase B1 in complex with tetrapeptide

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

Chitinase

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

3chf__assembly_2__model_1

3chf__assembly_2__model_1 | I(q)

3chf__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Crystal structure of Aspergillus fumigatus chitinase B1 in complex with tetrapeptide

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

Chitinase

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

3chf__assembly_2__model_1

3chf__assembly_2__model_1 | I(q)

3chf__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)