home *** CD-ROM | disk | FTP | other *** search
- **************************************
- * TFIIS zinc ribbon domain signature *
- **************************************
-
- Transcription factor S-II (TFIIS) [1] is a eukaryotic protein necessary for
- efficient RNA polymerase II transcription elongation, past template-encoded
- pause sites. TFIIS shows DNA-binding activity only in the presence of RNA
- polymerase II. It is a protein of about 300 amino acids whose sequence is
- highly conserved in mammals, Drosophila and yeast (where it was first known
- as PPR2, a transcriptional regulator of URA4, and then as DST1, the DNA strand
- transfer protein alpha [2]).
-
- Two viral proteins also belong to this family:
-
- - Vaccinia virus RNA polymerase 30 Kd subunit (rpo30) [3].
- - African swine fever virus protein I243L [4].
-
- The best conserved region of all these proteins contains four cysteines that
- bind a zinc ion and fold in a conformation termed a 'zinc ribbon' [5]. Besides
- these cysteines, there are a number of other conserved residues which can be
- used to help define a specific pattern for this type of domain.
-
- -Consensus pattern: C-x(2)-C-K-x(4)-[ST]-x(3)-[LIVM]-Q-T-R-[STA]-x-D-E-P-x(6)-
- C-x(2)-C
- [The four C's are zinc ligands]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: October 1993 / Text revised.
-
- [ 1] Hirashima S., Hirai H., Nakanishi Y., Natori S.
- J. Biol. Chem. 263:3858-3863(1988).
- [ 2] Kipling D., Kearsey S.E.
- Nature 353:509-509(1991).
- [ 3] Ahn B.-Y., Gershon P.D., Jones E.V., Moss B.
- Mol. Cell. Biol. 10:5433-5441(1990).
- [ 4] Rodriguez J.M., Salas M.L., Vinuela E.
- Virology 186:40-52(1992).
- [ 5] Qian X., Jeon C., Yoon H., Agarwal K., Weiss M.A.
- Nature 365:277-279(1993).
-