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- **********************************
- * Ribosomal protein S4 signature *
- **********************************
-
- Ribosomal protein S4 is one of the proteins from the small ribosomal subunit.
- In Escherichia coli, S4 is known to bind directly to 16S ribosomal RNA.
- Mutations in S4 have been shown to increase translational error frequencies.
- It belongs to a family of ribosomal proteins which, on the basis of sequence
- similarities [1,2], groups:
-
- - Eubacterial S4.
- - Archaebacterial S4.
- - Algal and plant chloroplast S4.
- - Mammalian S9.
- - Yeast YS11 (SUP45).
- - Marchantia polymorpha mitochondrial S4.
- - Dictyostelium discoideum rp1024.
- - Yeast protein NAM9 [3]. NAM9 has been characterized as a suppressor for
- ochre mutations in mitochondrial DNA. It could be a ribosomal protein that
- acts as a suppressor by decreasing translation accuracy.
-
- S4 is a protein of 171 to 205 amino-acid residues (except for NAM9 which is
- much larger). The signature pattern for this protein is based on a conserved
- region located in the central section of these proteins.
-
- -Consensus pattern: [LIVM]-[DE]-x-R-L-x(3)-[LIVM]-[VFYH]-[KR]-x(3)-[AGC]-x-
- [ST]-x(3)-A-[KR]-x-[LIVMF](2)
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Text revised.
-
- [ 1] Mizuta K., Hashimoto T., Suzuki K.I., Otaka E.
- Nucleic Acids Res. 19:2603-2608(1991).
- [ 2] Otaka E., Hashimoto T., Mizuta K.
- Protein Seq. Data Anal. 5:285-300(1993).
- [ 3] Boguta M., Dmochowska A., Borsuk P., Wrobel K., Gargouri A., Lazowska J.,
- Slonimski P., Szczesniak B., Kruszewska A.
- Mol. Cell. Biol. 12:402-412(1992).
-