UniProt Accession

 RS21B_YEAST; Q3E754; D6VW49; P05760 

Genbank Protein ID

 X87371; Z49411; BK006943 

Genbank Nucleotide ID

 CAA60819.1; CAA89431.1; DAA08665.1 

Protein Name

 40S ribosomal protein S21-B 

Protein Synonyms/Alias

 S26; YS25 

Gene Name

 RPS21B 

Gene Synonyms/Alias

 RPS25B; RPS26B; YJL136C; J0664 

Created Date

 July 27, 2013 

Organism

 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) 

NCBI Taxa ID

 559292 

Lysine Modification

Position	Peptide	Type	References
5	***MENDKGQLVELY	acetylation	[1]
38	SVQINVAKVDEEGRA	ubiquitination	[2]
80	AQNDGLLKNVWSYSR	ubiquitination	[2]

Reference

 [1] Preparative peptide isoelectric focusing as a tool for improving the identification of lysine-acetylated peptides from complex mixtures.
 Xie H, Bandhakavi S, Roe MR, Griffin TJ.
 J Proteome Res. 2007 May;6(5):2019-26. [PMID: 17397211]
 [2] Sites of ubiquitin attachment in Saccharomyces cerevisiae.
 Starita LM, Lo RS, Eng JK, von Haller PD, Fields S.
 Proteomics. 2012 Jan;12(2):236-40. [PMID: 22106047] 

Functional Description

 Required for the processing of the 20S rRNA-precursor to mature 18S rRNA in a late step of the maturation of 40S ribosomal subunits. Has a physiological role leading to 18S rRNA stability. 

Sequence Annotation

 MOD_RES 1 1 N-acetylmethionine.  

Keyword

 Acetylation; Complete proteome; Cytoplasm; Reference proteome; Ribonucleoprotein; Ribosomal protein; rRNA processing. 

Sequence Source

 UniProt (SWISSPROT/TrEMBL); GenBank; EMBL 

Protein Length

 87 AA 

Protein Sequence

Gene Ontology

 GO:0022627; C:cytosolic small ribosomal subunit; IDA:SGD.
 GO:0003735; F:structural constituent of ribosome; IDA:SGD.
 GO:0002181; P:cytoplasmic translation; IC:SGD.
 GO:0000447; P:endonucleolytic cleavage in ITS1 to separate SSU-rRNA from 5.8S rRNA and LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA); IMP:SGD.
 GO:0000461; P:endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA); IMP:SGD.
 GO:0006414; P:translational elongation; IBA:RefGenome. 

Interpro

 IPR001931; Ribosomal_S21e.
 IPR018279; Ribosomal_S21e_CS. 

Pfam

 PF01249; Ribosomal_S21e 

SMART

  

PROSITE

 PS00996; RIBOSOMAL_S21E 

PRINTS