Summary: Ribosomal protein S27a
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Ribosomal protein S27a Provide feedback
This family of ribosomal proteins consists mainly of the 40S ribosomal protein S27a which is synthesised as a C-terminal extension of ubiquitin (CEP). The S27a domain compromises the C-terminal half of the protein. The synthesis of ribosomal proteins as extensions of ubiquitin promotes their incorporation into nascent ribosomes by a transient metabolic stabilisation and is required for efficient ribosome biogenesis . The ribosomal extension protein S27a contains a basic region that is proposed to form a zinc finger; its fusion gene is proposed as a mechanism to maintain a fixed ratio between ubiquitin necessary for degrading proteins and ribosomes a source of proteins .
Mezquita J, Pau M, Mezquita C; , Gene 1997;195:313-319.: Characterization and expression of two chicken cDNAs encoding ubiquitin fused to ribosomal proteins of 52 and 80 amino acids. PUBMED:9305777 EPMC:9305777
Finley D, Bartel B, Varshavsky A; , Nature 1989;338:394-401.: The tails of ubiquitin precursors are ribosomal proteins whose fusion to ubiquitin facilitates ribosome biogenesis. PUBMED:2538753 EPMC:2538753
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR002906
Ribosomes are the particles that catalyse mRNA-directed protein synthesis in all organisms. The codons of the mRNA are exposed on the ribosome to allow tRNA binding. This leads to the incorporation of amino acids into the growing polypeptide chain in accordance with the genetic information. Incoming amino acid monomers enter the ribosomal A site in the form of aminoacyl-tRNAs complexed with elongation factor Tu (EF-Tu) and GTP. The growing polypeptide chain, situated in the P site as peptidyl-tRNA, is then transferred to aminoacyl-tRNA and the new peptidyl-tRNA, extended by one residue, is translocated to the P site with the aid the elongation factor G (EF-G) and GTP as the deacylated tRNA is released from the ribosome through one or more exit sites [PUBMED:11297922, PUBMED:11290319]. About 2/3 of the mass of the ribosome consists of RNA and 1/3 of protein. The proteins are named in accordance with the subunit of the ribosome which they belong to - the small (S1 to S31) and the large (L1 to L44). Usually they decorate the rRNA cores of the subunits.
Many ribosomal proteins, particularly those of the large subunit, are composed of a globular, surfaced-exposed domain with long finger-like projections that extend into the rRNA core to stabilise its structure. Most of the proteins interact with multiple RNA elements, often from different domains. In the large subunit, about 1/3 of the 23S rRNA nucleotides are at least in van der Waal's contact with protein, and L22 interacts with all six domains of the 23S rRNA. Proteins S4 and S7, which initiate assembly of the 16S rRNA, are located at junctions of five and four RNA helices, respectively. In this way proteins serve to organise and stabilise the rRNA tertiary structure. While the crucial activities of decoding and peptide transfer are RNA based, proteins play an active role in functions that may have evolved to streamline the process of protein synthesis. In addition to their function in the ribosome, many ribosomal proteins have some function 'outside' the ribosome [PUBMED:11290319, PUBMED:11114498].
This family of ribosomal proteins consists mainly of the 40S ribosomal protein S27a which is synthesized as a C-terminal extension of ubiquitin (CEP) (INTERPRO). The S27a domain compromises the C-terminal half of the protein. The synthesis of ribosomal proteins as extensions of ubiquitin promotes their incorporation into nascent ribosomes by a transient metabolic stabilisation and is required for efficient ribosome biogenesis [PUBMED:2538753]. The ribosomal extension protein S27a contains a basic region that is proposed to form a zinc finger; its fusion gene is proposed as a mechanism to maintain a fixed ratio between ubiquitin necessary for degrading proteins and ribosomes a source of proteins [PUBMED:2538756].
|Cellular component||ribosome (GO:0005840)|
|Molecular function||structural constituent of ribosome (GO:0003735)|
|Biological process||translation (GO:0006412)|
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A clan of zinc-binding ribbon domains.
The clan contains the following 50 members:A2L_zn_ribbon Auto_anti-p27 Baculo_LEF5_C DNA_RNApol_7kD DUF1610 DUF1936 DUF2116 DUF2180 DUF2387 DZR Elf1 GATA NinF NOB1_Zn_bind Ogr_Delta OrfB_Zn_ribbon PhnA_Zn_Ribbon Prim_Zn_Ribbon Ribosomal_L32p Ribosomal_L37ae Ribosomal_S27 Ribosomal_S27e RNA_POL_M_15KD RRN7 Spt4 TF_Zn_Ribbon TFIIS_C Tnp_zf-ribbon_2 Topo_Zn_Ribbon Toprim_Crpt Trm112p UPF0547 zf-C4_Topoisom zf-CHC2 zf-DHHC zf-dskA_traR zf-FPG_IleRS zf-GRF zf-NADH-PPase zf-RanBP zf-ribbon_3 zf-TFIIB zinc-ribbons_6 zinc_ribbon_2 zinc_ribbon_4 zinc_ribbon_5 Zn-ribbon_8 Zn_ribbon_recom Zn_Tnp_IS1 Zn_Tnp_IS1595
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Curation and family details
|Seed source:||Pfam-B_638 (release 4.1)|
|Author:||Bashton M, Bateman A|
|Number in seed:||12|
|Number in full:||740|
|Average length of the domain:||45.60 aa|
|Average identity of full alignment:||58 %|
|Average coverage of the sequence by the domain:||31.50 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||14|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Ribosomal_S27 domain has been found. There are 5 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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