1k9a

Crystal structure analysis of full-length carboxyl-terminal Src kinase at 2.5 A resolution

Method: X-RAY DIFFRACTION

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

Carboxyl-terminal Src kinase

Rattus norvegicus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
5	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
6	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
7	Protein homooligomer	Homooligomer	Protein 2	water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CSK_RAT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–450； UniProt 1–450 Author chain B； PDBConstruct 1–450； UniProt 1–450 Author chain C； PDBConstruct 1–450； UniProt 1–450 Author chain D； PDBConstruct 1–450； UniProt 1–450 Author chain E； PDBConstruct 1–450； UniProt 1–450 Author chain F； PDBConstruct 1–450； UniProt 1–450

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	1k9a
Deposition date deposition_date	2001-10-28
Structure title title	Crystal structure analysis of full-length carboxyl-terminal Src kinase at 2.5 A resolution
Keywords keywords	;carboxyl-terminal Src kinase, COOH-terminal Src kinase, Csk, Src, SFK, signal transduction, SH2, SH3, Src Homology, tyrosine kinase, cytoplasmic tyrosine kinase, Cbp, oncogene, cancer, TRANSFERASE ;; TRANSFERASE
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.

1k9a__assembly_7__model_1

Assembly 7 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1k9a__assembly_7__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1k9a__assembly_7__model_1 | P(r) · Pending

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

Rg（Guinier）	33.19 Å
Rg (electron density)	32.32 Å
Total Rg	32.80 Å
Atom count	6925
Residues	871
Excluded volume	123940 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1k9a__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1k9a__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1k9a__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`1k9a__assembly_4__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`1k9a__assembly_5__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
6	1	`1k9a__assembly_6__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
7	1	`1k9a__assembly_7__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 (2)

Entity 1 Entity 1 polymer

Description description	Carboxyl-terminal Src kinase
Molecular weight formula_weight	50813.2 kDa
EC 编号 ec_number	2.7.1.112
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	21313

MSAIQASWPSGTECIAKYNFHGTAEQDLPFCKGDVLTIVAVTKDPNWYKAKNKVGREGIIPANYVQKREGVKAGTKLSLMPWFHGKITREQAERLLYPPETGLFLVRESTNYPGDYTLCVSCEGKVEHYRIMYHASKLSIDEEVYFENLMQLVEHYTTDADGLCTRLIKPKVMEGTVAAQDEFYRSGWALNMKELKLLQTIGKGEFGDVMLGDYRGNKVAVKCIKNDATAQAFLAEASVMTQLRHSNLVQLLGVIVEEKGGLYIVTEYMAKGSLVDYLRSRGRSVLGGDCLLKFSLDVCEAMEYLEGNNFVHRDLAARNVLVSEDNVAKVSDFGLTKEASSTQDTGKLPVKWTAPEALREKKFSTKSDVWSFGILLWEIYSFGRVPYPRIPLKDVVPRVEKGYKMDAPDGCPPAVYDVMKNCWHLDAATRPTFLQLREQLEHIRTHELHL

Source Source

Source organism organism	Rattus norvegicus
Common name common_name	Norway rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
Host organism host_organism	Spodoptera frugiperda

Entity 2 Entity 2 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	428

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6. Fold Classification (SCOP + CATH) 42 domains

SCOP 2.08 (18 domains)

Domain ID domain_id	d1k9aa1
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.2 — SH3-domain
Family Family family	b.34.2.1 — SH3-domain

Domain ID domain_id	d1k9aa2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.93 — SH2-like
Superfamily Superfamily superfamily	d.93.1 — SH2 domain
Family Family family	d.93.1.1 — SH2 domain

Domain ID domain_id	d1k9aa3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.144 — Protein kinase-like (PK-like)
Superfamily Superfamily superfamily	d.144.1 — Protein kinase-like (PK-like)
Family Family family	d.144.1.7 — Protein kinases, catalytic subunit

Domain ID domain_id	d1k9ab1
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.2 — SH3-domain
Family Family family	b.34.2.1 — SH3-domain

Domain ID domain_id	d1k9ab2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.93 — SH2-like
Superfamily Superfamily superfamily	d.93.1 — SH2 domain
Family Family family	d.93.1.1 — SH2 domain

Domain ID domain_id	d1k9ab3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.144 — Protein kinase-like (PK-like)
Superfamily Superfamily superfamily	d.144.1 — Protein kinase-like (PK-like)
Family Family family	d.144.1.7 — Protein kinases, catalytic subunit

Domain ID domain_id	d1k9ac1
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.2 — SH3-domain
Family Family family	b.34.2.1 — SH3-domain

Domain ID domain_id	d1k9ac2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.93 — SH2-like
Superfamily Superfamily superfamily	d.93.1 — SH2 domain
Family Family family	d.93.1.1 — SH2 domain

Domain ID domain_id	d1k9ac3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.144 — Protein kinase-like (PK-like)
Superfamily Superfamily superfamily	d.144.1 — Protein kinase-like (PK-like)
Family Family family	d.144.1.7 — Protein kinases, catalytic subunit

Domain ID domain_id	d1k9ad1
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.2 — SH3-domain
Family Family family	b.34.2.1 — SH3-domain

Domain ID domain_id	d1k9ad2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.93 — SH2-like
Superfamily Superfamily superfamily	d.93.1 — SH2 domain
Family Family family	d.93.1.1 — SH2 domain

Domain ID domain_id	d1k9ad3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.144 — Protein kinase-like (PK-like)
Superfamily Superfamily superfamily	d.144.1 — Protein kinase-like (PK-like)
Family Family family	d.144.1.7 — Protein kinases, catalytic subunit

Domain ID domain_id	d1k9ae1
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.2 — SH3-domain
Family Family family	b.34.2.1 — SH3-domain

Domain ID domain_id	d1k9ae2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.93 — SH2-like
Superfamily Superfamily superfamily	d.93.1 — SH2 domain
Family Family family	d.93.1.1 — SH2 domain

Domain ID domain_id	d1k9ae3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.144 — Protein kinase-like (PK-like)
Superfamily Superfamily superfamily	d.144.1 — Protein kinase-like (PK-like)
Family Family family	d.144.1.7 — Protein kinases, catalytic subunit

Domain ID domain_id	d1k9af1
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.2 — SH3-domain
Family Family family	b.34.2.1 — SH3-domain

Domain ID domain_id	d1k9af2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.93 — SH2-like
Superfamily Superfamily superfamily	d.93.1 — SH2 domain
Family Family family	d.93.1.1 — SH2 domain

Domain ID domain_id	d1k9af3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.144 — Protein kinase-like (PK-like)
Superfamily Superfamily superfamily	d.144.1 — Protein kinase-like (PK-like)
Family Family family	d.144.1.7 — Protein kinases, catalytic subunit

CATH v4.4 (24 domains)

Domain ID domain_id	1k9aA01
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	40 — SH3 Domains

Domain ID domain_id	1k9aA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	505 — SHC Adaptor Protein
Homologous superfamily homologous superfamily	10 — SH2 domain

Domain ID domain_id	1k9aA03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1k9aA04
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	510 — Transferase(Phosphotransferase); domain 1
Homologous superfamily homologous superfamily	10 — Transferase(Phosphotransferase) domain 1

Domain ID domain_id	1k9aB01
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	40 — SH3 Domains

Domain ID domain_id	1k9aB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	505 — SHC Adaptor Protein
Homologous superfamily homologous superfamily	10 — SH2 domain

Domain ID domain_id	1k9aB03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1k9aB04
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	510 — Transferase(Phosphotransferase); domain 1
Homologous superfamily homologous superfamily	10 — Transferase(Phosphotransferase) domain 1

Domain ID domain_id	1k9aC01
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	40 — SH3 Domains

Domain ID domain_id	1k9aC02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	505 — SHC Adaptor Protein
Homologous superfamily homologous superfamily	10 — SH2 domain

Domain ID domain_id	1k9aC03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1k9aC04
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	510 — Transferase(Phosphotransferase); domain 1
Homologous superfamily homologous superfamily	10 — Transferase(Phosphotransferase) domain 1

Domain ID domain_id	1k9aD01
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	40 — SH3 Domains

Domain ID domain_id	1k9aD02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	505 — SHC Adaptor Protein
Homologous superfamily homologous superfamily	10 — SH2 domain

Domain ID domain_id	1k9aD03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1k9aD04
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	510 — Transferase(Phosphotransferase); domain 1
Homologous superfamily homologous superfamily	10 — Transferase(Phosphotransferase) domain 1

Domain ID domain_id	1k9aE01
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	40 — SH3 Domains

Domain ID domain_id	1k9aE02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	505 — SHC Adaptor Protein
Homologous superfamily homologous superfamily	10 — SH2 domain

Domain ID domain_id	1k9aE03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1k9aE04
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	510 — Transferase(Phosphotransferase); domain 1
Homologous superfamily homologous superfamily	10 — Transferase(Phosphotransferase) domain 1

Domain ID domain_id	1k9aF01
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	40 — SH3 Domains

Domain ID domain_id	1k9aF02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	505 — SHC Adaptor Protein
Homologous superfamily homologous superfamily	10 — SH2 domain

Domain ID domain_id	1k9aF03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1k9aF04
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	510 — Transferase(Phosphotransferase); domain 1
Homologous superfamily homologous superfamily	10 — Transferase(Phosphotransferase) domain 1

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Unit-cell length a length_a	115.000 Å
Unit-cell length b length_b	162.600 Å
Unit-cell length c length_c	232.400 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	24

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	73.500 Å
R factor r_factor	0.2460
R_work r_work	0.2460
R_free r_free	0.2880

Crystal structure analysis of full-length carboxyl-terminal Src kinase at 2.5 A resolution

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

Carboxyl-terminal Src kinase

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

1k9a__assembly_7__model_1

1k9a__assembly_7__model_1 | I(q)

1k9a__assembly_7__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 42 domains

SCOP 2.08 (18 domains)

CATH v4.4 (24 domains)

7. Citations (1)

Crystal structure analysis of full-length carboxyl-terminal Src kinase at 2.5 A resolution

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

Carboxyl-terminal Src kinase

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

1k9a__assembly_7__model_1

1k9a__assembly_7__model_1 | I(q)

1k9a__assembly_7__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 42 domains

SCOP 2.08 (18 domains)

CATH v4.4 (24 domains)

7. Citations (1)