SAXSdb — 4z2i

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

Chitinase B

Serratia marcescens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	;(1R,2R,3R,6R,7S,8S,9R,10R,12R,13S,17S)-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-5-oxo-9-(prop-2-yn-1-yloxy)-4,14,16-trioxabicyclo[11.3.1]heptadec-7-yl {3-[N'-(methylcarbamoyl)carbamimidamido]propyl}carbamate ; × 2 SODIUM ION × 1 GLYCEROL × 4 PHOSPHITE ION × 1 METHANOL × 1 water × 1	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	;(1R,2R,3R,6R,7S,8S,9R,10R,12R,13S,17S)-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-5-oxo-9-(prop-2-yn-1-yloxy)-4,14,16-trioxabicyclo[11.3.1]heptadec-7-yl {3-[N'-(methylcarbamoyl)carbamimidamido]propyl}carbamate ; × 4 SODIUM ION × 2 GLYCEROL × 8 PHOSPHITE ION × 2 METHANOL × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CHIB_SERMA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 6–503； UniProt 2–499

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	4z2i
Deposition date deposition_date	2015-03-30
Structure title title	Serratia marcescens Chitinase B complexed with macrolide inhibitor 30
Keywords keywords	Chitinase, Inhibitor, Macrolide, 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.

4z2i__assembly_2__model_1

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

Download this curve (.dat)

4z2i__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4z2i__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	37.07 Å
Rg (electron density)	36.57 Å
Total Rg	36.95 Å
Atom count	8084
Residues	996
Excluded volume	143400 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4z2i__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4z2i__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 (7)

Entity 1 Entity 1 polymer

Description description	Chitinase B
Molecular weight formula_weight	55925.4 kDa
EC 编号 ec_number	3.2.1.14
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	4468

DPSSRSTRKAVIGYYFIPTNQINNYTETDTSVVPFPVSNITPAKAKQLTHINFSFLDINSNLECAWDPATNDAKARDVVNRLTALKAHNPSLRIMFSIGGWYYSNDLGVSHANYVNAVKTPAARTKFAQSCVRIMKDYGFDGVDIDWEYPQAAEVDGFIAALQEIRTLLNQQTIADGRQALPYQLTIAGAGGAFFLSRYYSKLAQIVAPLDYINLMTYDLAGPWEKITNHQAALFGDAAGPTFYNALREANLGWSWEELTRAFPSPFSLTVDAAVQQHLMMEGVPSAKIVMGVPFYGRAFKGVSGGNGGQYSSHSTPGEDPYPNADYWLVGCDECVRDKDPRIASYRQLEQMLQGNYGYQRLWNDKTKTPYLYHAQNGLFVTYDDAESFKYKAKYIKQQQLGGVMFWHLGQDNRNGDLLAALDRYFNAADYDDSQLDMGTGLRYTGVGPGNLPIMTAPAYVPGTTYAQGALVSYQGYVWQTKWGYITSAPGSDSAWLKVGRLA

Source Source

Source organism organism	Serratia marcescens
NCBI taxonomy ID ncbi_taxonomy_id	615
Host organism host_organism	Escherichia coli DH5alpha

Entity 2 Entity 2 non-polymer

Description description	;(1R,2R,3R,6R,7S,8S,9R,10R,12R,13S,17S)-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-5-oxo-9-(prop-2-yn-1-yloxy)-4,14,16-trioxabicyclo[11.3.1]heptadec-7-yl {3-[N'-(methylcarbamoyl)carbamimidamido]propyl}carbamate ;
Molecular weight formula_weight	697.9 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 5 Entity 5 non-polymer

Description description	PHOSPHITE ION
Molecular weight formula_weight	79.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 6 Entity 6 non-polymer

Description description	METHANOL
Molecular weight formula_weight	32.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	426

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6. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

Domain ID domain_id	4z2iA01
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	4z2iA02
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	4z2iA03
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	10 — Seminal Fluid Protein PDC-109 (Domain B)
Homologous superfamily homologous superfamily	20 — Carbohydrate-binding module superfamily 5/12

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Unit-cell length a length_a	97.770 Å
Unit-cell length b length_b	97.770 Å
Unit-cell length c length_c	196.110 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 43 21 2
Space-group number int_tables_number	96
Crystal system crystal_system	—

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	39.930 Å
R factor r_factor	0.1587
R_work r_work	0.1572
R_free r_free	0.1848

Serratia marcescens Chitinase B complexed with macrolide inhibitor 30

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

Chitinase B

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

4z2i__assembly_2__model_1

4z2i__assembly_2__model_1 | I(q)

4z2i__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 (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

6. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

7. Citations (1)

Serratia marcescens Chitinase B complexed with macrolide inhibitor 30

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

Chitinase B

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

4z2i__assembly_2__model_1

4z2i__assembly_2__model_1 | I(q)

4z2i__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 (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

6. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

7. Citations (1)