SAXSdb — 3sli

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

INTRAMOLECULAR TRANS-SIALIDASE

Macrobdella decora

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	2-ACETYLAMINO-7-(1,2-DIHYDROXY-ETHYL)-3-HYDROXY-6,8-DIOXA-BICYCLO[3.2.1]OCTANE-5-CARBOXYLIC ACID × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	NANL_MACDE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–679； UniProt 81–759

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	3sli
Deposition date deposition_date	1998-10-03
Structure title title	LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2,7-ANHYDRO-NEU5AC PREPARED BY SOAKING WITH 3'-SIALYLLACTOSE
Keywords keywords	HYDROLASE, INTRAMOLECULAR TRANS-SIALIDASE, NEURAMINIDASE; HYDROLASE
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.

3sli__assembly_1__model_1

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

Download this curve (.dat)

3sli__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3sli__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	28.49 Å
Rg (electron density)	27.73 Å
Total Rg	28.43 Å
Atom count	5277
Residues	679
Excluded volume	93247 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3sli__assembly_1__model_1`	monomeric （1）	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	INTRAMOLECULAR TRANS-SIALIDASE
Molecular weight formula_weight	74565.7 kDa
EC 编号 ec_number	3.2.1.18
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	5824

IPEGILMEKNNVDIAEGQGYSLDQEAGAKYVKAMTQGTIILSYKSTSENGIQSLFSVGNSTAGNQDRHFHIYITNSGGIGIELRNTDGVFNYTLDRPASVRALYKGERVFNTVALKADAANKQCRLFANGELLATLDKDAFKFISDITGVDNVTLGGTKRQGKIAYPFGGTIGDIKVYSNALSDEELIQATGVTTYGENIFYAGDVTESNYFRIPSLLTLSTGTVISAADARYGGTHDSKSKINIAFAKSTDGGNTWSEPTLPLKFDDYIAKNIDWPRDSVGKNVQIQGSASYIDPVLLEDKLTKRIFLFADLMPAGIGSSNASVGSGFKEVNGKKYLKLRWHKDAGRAYDYTIREKGVIYNDATNQPTEFRVDGEYNLYQHDTNLTCKQYDYNFSGNNLIESKTDVDVNMNIFYKNSVFKAFPTNYLAMRYSDDEGASWSDLDIVSSFKPEVSKFLVVGPGIGKQISTGENAGRLLVPLYSKSSAELGFMYSDDHGDNWTYVEADNLTGGATAEAQIVEMPDGSLKTYLRTGSNCIAEVTSIDGGETWSDRVPLQGISTTSYGTQLSVINYSQPIDGKPAIILSSPNATNGRKNGKIWIGLVNDTGNTGIDKYSVEWKYSYAVDTPQMGYSYSCLAELPDGQVGLLYEKYDSWSRNELHLKDILKFEKYSISELTGQA

Source Source

Source organism organism	Macrobdella decora
Common name common_name	North American leech
NCBI taxonomy ID ncbi_taxonomy_id	6405
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	2-ACETYLAMINO-7-(1,2-DIHYDROXY-ETHYL)-3-HYDROXY-6,8-DIOXA-BICYCLO[3.2.1]OCTANE-5-CARBOXYLIC ACID
Molecular weight formula_weight	291.3 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	547

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6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3slia1
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.9 — Leech intramolecular trans-sialidase, N-terminal domain

Domain ID domain_id	d3slia2
Class class	b — All beta proteins
Fold Fold fold	b.68 — 6-bladed beta-propeller
Superfamily Superfamily superfamily	b.68.1 — Sialidases
Family Family family	b.68.1.1 — Sialidases (neuraminidases)

CATH v4.4 (3 domains)

Domain ID domain_id	3sliA01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3sliA02
Class class	2 — Mainly Beta
Architecture architecture	120 — 6 Propeller
Topology topology	10 — Neuraminidase
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3sliA03
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	220 — Intramolecular trans-sialidase; domain 3
Homologous superfamily homologous superfamily	10 — Intramolecular Trans-sialidase; Domain 3

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Unit-cell length a length_a	46.196 Å
Unit-cell length b length_b	69.290 Å
Unit-cell length c length_c	72.323 Å
Unit-cell angle α angle_alpha	112.78 °
Unit-cell angle β angle_beta	95.62 °
Unit-cell angle γ angle_gamma	107.14 °
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	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	15.000 Å
R factor r_factor	0.1870
R_work r_work	0.1870
R_free r_free	0.2180

LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2,7-ANHYDRO-NEU5AC PREPARED BY SOAKING WITH 3'-SIALYLLACTOSE

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

INTRAMOLECULAR TRANS-SIALIDASE

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

3sli__assembly_1__model_1

3sli__assembly_1__model_1 | I(q)

3sli__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) 5 domains

SCOP 2.08 (2 domains)

CATH v4.4 (3 domains)

7. Citations (1)

LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2,7-ANHYDRO-NEU5AC PREPARED BY SOAKING WITH 3'-SIALYLLACTOSE

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

INTRAMOLECULAR TRANS-SIALIDASE

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

3sli__assembly_1__model_1

3sli__assembly_1__model_1 | I(q)

3sli__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) 5 domains

SCOP 2.08 (2 domains)

CATH v4.4 (3 domains)

7. Citations (1)