3zdg

Crystal Structure of Ls-AChBP complexed with carbamoylcholine analogue 3-(dimethylamino)butyl dimethylcarbamate (DMABC)

Method: X-RAY DIFFRACTION

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1. 蛋白身份与相关结构 Protein Identity & Related Structures

ACETYLCHOLINE BINDING PROTEIN

LYMNAEA STAGNALIS

当前结构中的状态

Assembly	物理组成	蛋白状态	分子拷贝数	共同组分	数据核对
1	蛋白同源多聚体	同源多聚体	蛋白 5	3-(dimethylamino)butyl dimethylcarbamate × 5 SULFATE ION × 6 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 DI(HYDROXYETHYL)ETHER × 1 water × 5	与蛋白数一致
2	蛋白同源多聚体	同源多聚体	蛋白 5	3-(dimethylamino)butyl dimethylcarbamate × 5 SULFATE ION × 6 water × 5	与蛋白数一致
3	蛋白同源多聚体	同源多聚体	蛋白 5	3-(dimethylamino)butyl dimethylcarbamate × 5 SULFATE ION × 5 water × 5	与蛋白数一致
4	蛋白同源多聚体	同源多聚体	蛋白 5	3-(dimethylamino)butyl dimethylcarbamate × 5 SULFATE ION × 3 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 PENTAETHYLENE GLYCOL × 1 water × 5	与蛋白数一致

数据库中的同蛋白其他状态

查看构建体与数据证据

UniProt名称	ACHP_LYMST
Isoform	—
PDB实体	1
链与序列区间	作者链 A； PDB构建体 1–210； UniProt 20–229 作者链 B； PDB构建体 1–210； UniProt 20–229 作者链 C； PDB构建体 1–210； UniProt 20–229 作者链 D； PDB构建体 1–210； UniProt 20–229 作者链 E； PDB构建体 1–210； UniProt 20–229 作者链 F； PDB构建体 1–210； UniProt 20–229 作者链 G； PDB构建体 1–210； UniProt 20–229 作者链 H； PDB构建体 1–210； UniProt 20–229 作者链 I； PDB构建体 1–210； UniProt 20–229 作者链 J； PDB构建体 1–210； UniProt 20–229 作者链 K； PDB构建体 1–210； UniProt 20–229 作者链 L； PDB构建体 1–210； UniProt 20–229 作者链 M； PDB构建体 1–210； UniProt 20–229 作者链 N； PDB构建体 1–210； UniProt 20–229 作者链 O； PDB构建体 1–210； UniProt 20–229 作者链 P； PDB构建体 1–210； UniProt 20–229 作者链 Q； PDB构建体 1–210； UniProt 20–229 作者链 R； PDB构建体 1–210； UniProt 20–229 作者链 S； PDB构建体 1–210； UniProt 20–229 作者链 T； PDB构建体 1–210； UniProt 20–229

页面优先展示蛋白身份、当前 assembly、共同组分、聚集状态和跨 PDB 结构链接。链映射与序列区间收在“数据证据”中；数据库内部编号、导入时间和 assembly 操作表达式仅用于维护，因此不在读者页面展示。

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2. 结构基本信息 2. Structure Basics

条目编号 entry_id	3zdg
沉积日期 deposition_date	2012-11-26
结构标题 title	Crystal Structure of Ls-AChBP complexed with carbamoylcholine analogue 3-(dimethylamino)butyl dimethylcarbamate (DMABC)
关键词 keywords	ACETYLCHOLINE-BINDING PROTEIN; ACETYLCHOLINE-BINDING PROTEIN
实验方法 method	X-RAY DIFFRACTION

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3. Official assembly/model 理论 SAXS Official SAXS Profiles

页面只读取最新 assembly 计算结果。每一条曲线都对应明确的 PDB、official biological assembly 和 coordinate model。

3zdg__assembly_1__model_1

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

下载该曲线 .dat

3zdg__assembly_1__model_1 | I(q)

100 个绘图点；横轴和纵轴均采用对数尺度。

3zdg__assembly_1__model_1 | P(r) · Pending

P(r) 将按相同 assembly/model 分别计算和展示。

Rg（Guinier）	31.31 Å
Rg（电子密度）	29.52 Å
总 Rg	30.42 Å
原子数	8100
残基数	994
排除体积	142870 Å³
最大 q	0.500 Å⁻¹

Assembly	Model	结构单元	聚集说明	状态	CRYSOL	操作
1	1	`3zdg__assembly_1__model_1`	pentameric （5）	成功	4.1.3-1-20251215 (887e7ef)	查看下载
2	1	`3zdg__assembly_2__model_1`	pentameric （5）	成功	4.1.3-1-20251215 (887e7ef)	查看下载
3	1	`3zdg__assembly_3__model_1`	pentameric （5）	成功	4.1.3-1-20251215 (887e7ef)	查看下载
4	1	`3zdg__assembly_4__model_1`	pentameric （5）	成功	4.1.3-1-20251215 (887e7ef)	查看下载

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4. 晶体学与实验 4. Crystallography & Experiment

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5. 实体与聚合物信息 Entities & Polymers (7)

实体 1 Entity 1 polymer

描述 description	ACETYLCHOLINE BINDING PROTEIN
分子量 formula_weight	23862.5 kDa
来源方法 src_method	man
拷贝数 entity_count	20

聚合物 Polymer

聚合物类型 type	polypeptide(L)
链编号 strand_id	A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T
原子数 atom_count	34575

LDRADILYNIRQTSRPDVIPTQRDRPVAVSVSLKFINILEVNEITNEVDVVFWQQTTWSDRTLAWNSSHSPDQVSVPISSLWVPDLAAYNAISKPEVLTPQLARVVSDGEVLYMPSIRQRFSCDVSGVDTESGATCRIKIGSWTHHSREISVDPTTENSDDSEYFSQYSRFEILDVTQKKNSVTYSCCPEAYEDVEVSLNFRKKGRSEIL

来源 Source

来源生物 organism	LYMNAEA STAGNALIS
通用名 common_name	GREAT POND SNAIL
NCBI 分类编号 ncbi_taxonomy_id	6523
宿主生物 host_organism	SPODOPTERA FRUGIPERDA

实体 2 Entity 2 non-polymer

描述 description	3-(dimethylamino)butyl dimethylcarbamate
分子量 formula_weight	188.3 kDa
来源方法 src_method	syn
拷贝数 entity_count	20

实体 3 Entity 3 non-polymer

描述 description	SULFATE ION
分子量 formula_weight	96.1 kDa
来源方法 src_method	syn
拷贝数 entity_count	20

实体 4 Entity 4 non-polymer

描述 description	2-acetamido-2-deoxy-beta-D-glucopyranose
分子量 formula_weight	221.2 kDa
来源方法 src_method	man
拷贝数 entity_count	3

实体 5 Entity 5 non-polymer

描述 description	DI(HYDROXYETHYL)ETHER
分子量 formula_weight	106.1 kDa
来源方法 src_method	syn
拷贝数 entity_count	1

实体 6 Entity 6 non-polymer

描述 description	PENTAETHYLENE GLYCOL
分子量 formula_weight	238.3 kDa
来源方法 src_method	syn
拷贝数 entity_count	1

实体 7 Entity 7 water

描述 description	water
分子量 formula_weight	18.0 kDa
来源方法 src_method	nat
拷贝数 entity_count	2042

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6. 折叠分类 (SCOP + CATH) 40 domains

SCOP 2.08 (20 domains)

结构域编号 domain_id	d3zdga_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgb_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgc_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgd_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdge_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgf_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgg_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgh_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgi_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgj_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgk_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgl_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgm_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgn_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgo_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgp_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgq_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgr_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgs_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

结构域编号 domain_id	d3zdgt_
类 Class class	b — All beta proteins
折叠类型 Fold fold	b.96 — Nicotinic receptor ligand binding domain-like
超家族 Superfamily superfamily	b.96.1 — Nicotinic receptor ligand binding domain-like
家族 Family family	b.96.1.1 — Nicotinic receptor ligand binding domain-like

CATH v4.4 (20 domains)

结构域编号 domain_id	3zdgA00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgB00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgC00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgD00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgE00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgF00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgG00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgH00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgI00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgJ00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgK00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgL00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgM00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgN00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgO00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgP00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgQ00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgR00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgS00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

结构域编号 domain_id	3zdgT00
类 Class class	2 — Mainly Beta
架构 Architecture architecture	70 — Distorted Sandwich
拓扑 Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
同源超家族 H-superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

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晶胞边长 a length_a	123.730 Å
晶胞边长 b length_b	144.880 Å
晶胞边长 c length_c	139.030 Å
晶胞夹角 α angle_alpha	90.00 °
晶胞夹角 β angle_beta	107.90 °
晶胞夹角 γ angle_gamma	90.00 °
晶胞分子数 Z z_pdb	40

空间群 space_group	P 1 21 1
空间群编号 int_tables_number	4
晶系 crystal_system	—

分辨率 resolution	2.480 Å
最低分辨率 resolution_low	37.338 Å
R 因子 r_factor	0.1753
R_work r_work	0.1729
R_free r_free	0.2209

Crystal Structure of Ls-AChBP complexed with carbamoylcholine analogue 3-(dimethylamino)butyl dimethylcarbamate (DMABC)

1. 蛋白身份与相关结构 Protein Identity & Related Structures

ACETYLCHOLINE BINDING PROTEIN

当前结构中的状态

数据库中的同蛋白其他状态

2. 结构基本信息 2. Structure Basics

3. Official assembly/model 理论 SAXS Official SAXS Profiles

3zdg__assembly_1__model_1

3zdg__assembly_1__model_1 | I(q)

3zdg__assembly_1__model_1 | P(r) · Pending

4. 晶体学与实验 4. Crystallography & Experiment

晶胞参数 Unit Cell

对称性 Symmetry

精修参数 Refinement

衍射实验 Diffraction

5. 实体与聚合物信息 Entities & Polymers (7)

实体 1 Entity 1 polymer

聚合物 Polymer

来源 Source

实体 2 Entity 2 non-polymer

实体 3 Entity 3 non-polymer

实体 4 Entity 4 non-polymer

实体 5 Entity 5 non-polymer

实体 6 Entity 6 non-polymer

实体 7 Entity 7 water

6. 折叠分类 (SCOP + CATH) 40 domains

SCOP 2.08 (20 domains)

CATH v4.4 (20 domains)

7. 引用文献 (1)

Crystal Structure of Ls-AChBP complexed with carbamoylcholine analogue 3-(dimethylamino)butyl dimethylcarbamate (DMABC)

1. 蛋白身份与相关结构 Protein Identity & Related Structures

ACETYLCHOLINE BINDING PROTEIN

当前结构中的状态

数据库中的同蛋白其他状态

单体

同源二聚体

同源四聚体

其他同源多聚体

异源或核酸复合物

2. 结构基本信息 2. Structure Basics

3. Official assembly/model 理论 SAXS Official SAXS Profiles

3zdg__assembly_1__model_1

3zdg__assembly_1__model_1 | I(q)

3zdg__assembly_1__model_1 | P(r) · Pending

4. 晶体学与实验 4. Crystallography & Experiment

晶胞参数 Unit Cell

对称性 Symmetry

精修参数 Refinement

衍射实验 Diffraction

5. 实体与聚合物信息 Entities & Polymers (7)

实体 1 Entity 1 polymer

聚合物 Polymer

来源 Source

实体 2 Entity 2 non-polymer

实体 3 Entity 3 non-polymer

实体 4 Entity 4 non-polymer

实体 5 Entity 5 non-polymer

实体 6 Entity 6 non-polymer

实体 7 Entity 7 water

6. 折叠分类 (SCOP + CATH) 40 domains

SCOP 2.08 (20 domains)

CATH v4.4 (20 domains)

7. 引用文献 (1)