7kqf

The internal aldimine form of the wild-type Tryptophan Synthase from Salmonella in complex with inhibitor N-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (F9F) at the enzyme alpha-site and cesium ion at the metal coordination site at 1.47 Angstrom resolution

Method: X-RAY DIFFRACTION

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

Tryptophan synthase alpha chain

Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Tryptophan synthase beta chain × 1 （P0A2K1） 2-({[4-(TRIFLUOROMETHOXY)PHENYL]SULFONYL}AMINO)ETHYL DIHYDROGEN PHOSPHATE × 1 1,2-ETHANEDIOL × 4 DI(HYDROXYETHYL)ETHER × 6 DIMETHYL SULFOXIDE × 1 CESIUM ION × 4 CHLORIDE ION × 6 PYRIDOXAL-5'-PHOSPHATE × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TRPA_SALTY
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–268； UniProt 1–268

Tryptophan synthase beta chain

Salmonella enterica subsp. enterica serovar Typhimurium

UniProt P0A2K1

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Tryptophan synthase alpha chain × 1 （P00929） 2-({[4-(TRIFLUOROMETHOXY)PHENYL]SULFONYL}AMINO)ETHYL DIHYDROGEN PHOSPHATE × 1 1,2-ETHANEDIOL × 4 DI(HYDROXYETHYL)ETHER × 6 DIMETHYL SULFOXIDE × 1 CESIUM ION × 4 CHLORIDE ION × 6 PYRIDOXAL-5'-PHOSPHATE × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TRPB_SALTY
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–397； UniProt 1–397

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	7kqf
Deposition date deposition_date	2020-11-15
Structure title title	The internal aldimine form of the wild-type Tryptophan Synthase from Salmonella in complex with inhibitor N-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (F9F) at the enzyme alpha-site and cesium ion at the metal coordination site at 1.47 Angstrom resolution
Keywords keywords	inhibitor, LYASE, LYASE-LYASE INHIBITOR complex; LYASE/LYASE 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.

7kqf__assembly_1__model_1

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

Download this curve (.dat)

7kqf__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

7kqf__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.39 Å
Rg (electron density)	26.65 Å
Total Rg	27.61 Å
Atom count	5101
Residues	661
Excluded volume	91450 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`7kqf__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 (10)

Entity 1 Entity 1 polymer

Description description	Tryptophan synthase alpha chain
Molecular weight formula_weight	28698.8 kDa
EC 编号 ec_number	4.2.1.20
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	6192

MERYENLFAQLNDRREGAFVPFVTLGDPGIEQSLKIIDTLIDAGADALELGVPFSDPLADGPTIQNANLRAFAAGVTPAQCFEMLALIREKHPTIPIGLLMYANLVFNNGIDAFYARCEQVGVDSVLVADVPVEESAPFRQAALRHNIAPIFICPPNADDDLLRQVASYGRGYTYLLSRSGVTGAENRGALPLHHLIEKLKEYHAAPALQGFGISSPEQVSAAVRAGAAGAISGSAIVKIIEKNLASPKQMLAELRSFVSAMKAASRA

Source Source

Source organism organism	Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)
NCBI taxonomy ID ncbi_taxonomy_id	99287
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Tryptophan synthase beta chain
Molecular weight formula_weight	42918.9 kDa
EC 编号 ec_number	4.2.1.20
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MTTLLNPYFGEFGGMYVPQILMPALNQLEEAFVSAQKDPEFQAQFADLLKNYAGRPTALTKCQNITAGTRTTLYLKREDLLHGGAHKTNQVLGQALLAKRMGKSEIIAETGAGQHGVASALASALLGLKCRIYMGAKDVERQSPNVFRMRLMGAEVIPVHSGSATLKDACNEALRDWSGSYETAHYMLGTAAGPHPYPTIVREFQRMIGEETKAQILDKEGRLPDAVIACVGGGSNAIGMFADFINDTSVGLIGVEPGGHGIETGEHGAPLKHGRVGIYFGMKAPMMQTADGQIEESYSISAGLDFPSVGPQHAYLNSIGRADYVSITDDEALEAFKTLCRHEGIIPALESSHALAHALKMMREQPEKEQLLVVNLSGRGDKDIFTVHDILKARGEI

Source Source

Source organism organism	Salmonella enterica subsp. enterica serovar Typhimurium
NCBI taxonomy ID ncbi_taxonomy_id	90371
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	2-({[4-(TRIFLUOROMETHOXY)PHENYL]SULFONYL}AMINO)ETHYL DIHYDROGEN PHOSPHATE
Molecular weight formula_weight	365.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	1,2-ETHANEDIOL
Molecular weight formula_weight	62.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 5 Entity 5 non-polymer

Description description	DI(HYDROXYETHYL)ETHER
Molecular weight formula_weight	106.1 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 6 Entity 6 non-polymer

Description description	DIMETHYL SULFOXIDE
Molecular weight formula_weight	78.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	CESIUM ION
Molecular weight formula_weight	132.9 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 8 Entity 8 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 9 Entity 9 non-polymer

Description description	PYRIDOXAL-5'-PHOSPHATE
Molecular weight formula_weight	247.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 10 Entity 10 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	782

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Unit-cell length a length_a	181.851 Å
Unit-cell length b length_b	58.561 Å
Unit-cell length c length_c	67.183 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	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	1.470 Å
Low-resolution limit resolution_low	39.020 Å
R factor r_factor	0.1249
R_work r_work	0.1231
R_free r_free	0.1594

The internal aldimine form of the wild-type Tryptophan Synthase from Salmonella in complex with inhibitor N-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (F9F) at the enzyme alpha-site and cesium ion at the metal coordination site at 1.47 Angstrom resolution

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

Tryptophan synthase alpha chain

State in the Current Structure

Other States of the Same Protein in the Database

Tryptophan synthase beta chain

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

7kqf__assembly_1__model_1

7kqf__assembly_1__model_1 | I(q)

7kqf__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 (10)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

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 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

Entity 10 Entity 10 water

7. Citations (1)

The internal aldimine form of the wild-type Tryptophan Synthase from Salmonella in complex with inhibitor N-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (F9F) at the enzyme alpha-site and cesium ion at the metal coordination site at 1.47 Angstrom resolution

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

Tryptophan synthase alpha chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Tryptophan synthase beta chain

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

7kqf__assembly_1__model_1

7kqf__assembly_1__model_1 | I(q)

7kqf__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 (10)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

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 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

Entity 10 Entity 10 water

7. Citations (1)