Similarity between the association factor of ribosomal subunits and the protein Stm1p from Saccharomyces cerevisiae

• Main Authors: Heriberto Correia, Rafael Medina, Alexandra Hernández, Ekaterina Bustamante, Kalpana Chakraburtty, Flor Herrera
• Format: Article
• Language: English
• Published: Instituto Oswaldo Cruz, Ministério da Saúde 2004-11-01
• Series: Memórias do Instituto Oswaldo Cruz.
• Subjects: ribosomal association factor; Stm1p; G4 DNA; ribosomal function; G4p2; triplex-DNA
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762004000700012
• ISSN: 0074-0276; 1678-8060

A ribosome association factor (AF) was isolated from the yeast Sacchharomyces cerevisiae. Partial amino acid sequence of AF was determined from its fragment of 25 kDa isolated by treating AF with 2-(2-nitrophenylsulfenyl)-3-methyl-3'-Bromoindolenine (BNPS-skatole). This sequence has a 86% identity to the product of the single-copy S. cerevisiae STM1 gene that is apparently involved in several events like binding to quadruplex and triplex nucleic acids and participating in apoptosis, stability of telomere structures, cell cycle, and ribosomal function. Here we show that AF and Stm1p share some characteristics: both bind to quadruplex and Pu triplex DNA, associates ribosomal subunits, and are thermostable. These observations suggest that these polypeptides belong to a family of proteins that may have roles in the translation process.