Chains	Domain	Class	Architecture	Topology	Homology
B1	4dr2B01	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Glucose-6-phosphate isomerase like protein; domain 1
B2	4dr2B02	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	Helix hairpin bin
C1	4dr2C01	Alpha Beta	2-Layer Sandwich	GMP Synthetase; Chain A, domain 3
C2	4dr2C02	Alpha Beta	2-Layer Sandwich	Ribosomal protein S3 C-terminal domain
D1	4dr2D01	Mainly Alpha	Orthogonal Bundle	Ribosomal Protein S4 Delta 41; Chain A, domain 1	Ribosomal Protein S4 Delta 41; Chain A, domain 1
D2	4dr2D02	Alpha Beta	Roll	Structural Genomics Hypothetical 15.5 Kd Protein In mrcA- pckA Intergenic Region; Chain A	Structural Genomics Hypothetical 15.5 Kd Protein In Mrca- pcka Intergenic Region; Chain
E1	4dr2E01	Alpha Beta	2-Layer Sandwich	Double Stranded RNA Binding Domain
E2	4dr2E02	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5; domain 2
F	4dr2F00	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits
G	4dr2G00	Mainly Alpha	Orthogonal Bundle	Ribosomal Protein S7	Ribosomal Protein S7;
H2	4dr2H02	Alpha Beta	2-Layer Sandwich	Dna Ligase; domain 1
I	4dr2I00	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5; domain 2
K	4dr2K00	Alpha Beta	2-Layer Sandwich	Nucleotidyltransferase; domain 5
L	4dr2L00	Mainly Beta	Beta Barrel	OB fold (Dihydrolipoamide Acetyltransferase, E2P)	Nucleic acid-binding proteins
M1	4dr2M01	Mainly Alpha	Orthogonal Bundle	Helicase, Ruva Protein; domain 3
M2	4dr2M02	Few Secondary Structures	Irregular	30s ribosomal protein s13; domain 2	30s ribosomal protein s13, domain 2
N	4dr2N00	Few Secondary Structures	Irregular	30s Ribosomal Protein S14; Chain N	30s Ribosomal Protein S14; Chain N
O	4dr2O00	Mainly Alpha	Orthogonal Bundle	Helix Hairpins
R	4dr2R00	Few Secondary Structures	Irregular	30s Ribosomal Protein S18	30s Ribosomal Protein S18
S	4dr2S00	Alpha Beta	2-Layer Sandwich	30s Ribosomal Protein S19; Chain A	30s Ribosomal Protein S19; Chain A
T	4dr2T00	Mainly Alpha	Up-down Bundle	Methane Monooxygenase Hydroxylase; Chain G, domain 1

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	16S rRNA (4DR2:A)	none	none	none
B	30S ribosomal protein S2 (4DR2:B)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome Small Ribosomal Subunit
C	30S ribosomal protein S3 (4DR2:C)	Nucleic Acid Binding RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome Small Ribosomal Subunit
D	30S ribosomal protein S4 (4DR2:D)	RNA Binding Structural Constituent of Ribosome RRNA Binding Metal Ion Binding	Translation	Intracellular Ribosome Small Ribosomal Subunit
E	30S ribosomal protein S5 (4DR2:E)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome Small Ribosomal Subunit
F	30S ribosomal protein S6 (4DR2:F)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome
G	30S ribosomal protein S7 (4DR2:G)	TRNA Binding RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome Small Ribosomal Subunit
H	30S ribosomal protein S8 (4DR2:H)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome
I	30S ribosomal protein S9 (4DR2:I)	TRNA Binding RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome
J	30S ribosomal protein S10 (4DR2:J)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
K	30S ribosomal protein S11 (4DR2:K)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
L	30S ribosomal protein S12 (4DR2:L)	TRNA Binding RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome Small Ribosomal Subunit
M	30S ribosomal protein S13 (4DR2:M)	TRNA Binding Nucleic Acid Binding RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
N	30S ribosomal protein S14 (4DR2:N)	RNA Binding Structural Constituent of Ribosome RRNA Binding Metal Ion Binding	Translation	Intracellular Ribosome
O	30S ribosomal protein S15 (4DR2:O)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
P	30S ribosomal protein S16 (4DR2:P)	Structural Constituent of Ribosome	Translation	Intracellular Ribosome
Q	30S ribosomal protein S17 (4DR2:Q)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
R	30S ribosomal protein S18 (4DR2:R)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
S	30S ribosomal protein S19 (4DR2:S)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Ribosome Small Ribosomal Subunit
T	30S ribosomal protein S20 (4DR2:T)	RNA Binding Structural Constituent of Ribosome RRNA Binding	Translation	Intracellular Ribosome
U	30S ribosomal protein THX (4DR2:U)	RNA Binding RRNA Binding	none	Ribosome

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139555 Biological Macromolecular Structures Enabling Breakthroughs in Research and Education

4DR2

Crystal structure of the Thermus thermophilus (HB8) 30S ribosomal subunit with multiple copies of paromomycin molecules bound

Macromolecule Annotations for the Entities in PDB 4DR2

Domain Annotation: CATH CATH Database (version 4.0.0) Homepage

Protein Family Annotation Pfam Database Homepage

Gene Product Annotation Gene Ontology Consortium Homepage

Protein Modification Annotation