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PMID:2461734

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Citation

Nowotny, V and Nierhaus, KH (1988) Assembly of the 30S subunit from Escherichia coli ribosomes occurs via two assembly domains which are initiated by S4 and S7. Biochemistry 27:7051-5

Abstract

A protein which initiates assembly of ribosomes is defined as a protein which binds to the respective rRNA without cooperativity (i.e., without the help of other proteins) during the onset of assembly and is essential for the formation of active ribosomal subunits. The number of proteins binding without cooperativity was determined by monitoring the reconstitution output of active particles at various inputs of 16S rRNA, in the presence of constant amounts of 30S-derived proteins (TP30): This showed that only two of the proteins of the 30S subunit are assembly-initiator proteins. These two proteins are still present on a LiCl core particle comprising 16S rRNA and 12 proteins (including minor proteins). The 12 proteins were isolated, and a series of reconstitution experiments at various levels of rRNA excess demonstrated that S4 and S7 are the initiator proteins. Pulse-chase experiments performed during the early assembly with 14C- and 3H-labeled TP30 and the determination of the 14C/3H ratio of the individual proteins within the assembled particles revealed a bilobal structure of the 30S assembly: A group of six proteins headed by S4 (namely, S4, S20, S16, S15, S6, and S18) resisted the chasing most efficiently (S4 assembly domain). None of the proteins depending on S7 during assembly were found in this group but rather in a second group with intermediate chasing stability [S7 assembly domain; consisting of S7, S9, (S8), S19, and S3]. A number of proteins could be fully chased during the early assembly and therefore represent "late assembly proteins" (S10, S5, S13, S2, S21, S1). These findings fit well with the 30S assembly map.(ABSTRACT TRUNCATED AT 250 WORDS)

Links

PubMed

Keywords

Escherichia coli/metabolism; Protein Conformation; RNA, Bacterial/metabolism; RNA, Ribosomal, 16S/metabolism; Ribosomal Proteins/metabolism; Ribosomes/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:RS7

acts_upstream_of_or_within

GO:0000028: ribosomal small subunit assembly

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

ECOLI:RS12

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS16

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS18

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS20

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS4

involved_in

GO:0000028: ribosomal small subunit assembly

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

ECOLI:RS4

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS5

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS8

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS9

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS15

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS17

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS7

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RS7

involved_in

GO:0000028: ribosomal small subunit assembly

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

ECOLI:RS3

enables

GO:0003735: structural constituent of ribosome

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete


See also

References

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