|PROSITE documentation PDOC00854 [for PROSITE entry PS01110]|
In eukaryotes, there are three different forms of DNA-dependent RNA polymerases (EC 188.8.131.52) transcribing different sets of genes. Each class of RNA polymerase is an assemblage of ten to twelve different polypeptides. In archaebacteria, there is generally a single form of RNA polymerase which also consist of an oligomeric assemblage of 10 to 13 polypeptides.
Archaebacterial subunit H (gene rpoH) [1,2] is a small protein of about 8.5 to 10 Kd, it is evolutionary related to the C-terminal part of a 23 Kd component shared by all three forms of eukaryotic RNA polymerases (gene RPB5 in yeast and POLR2E in mammals).
As a signature pattern we selected a conserved region which is located at the N-terminal extremity of subunit H; this region contains two histidines that could play a role in the binding of a metal ion.Last update:
December 2004 / Pattern and text revised.
PROSITE method (with tools and information) covered by this documentation:
|1||Authors||Klenk H.-P., Palm P., Lottspeich F., Zillig W.|
|Title||Component H of the DNA-dependent RNA polymerases of Archaea is homologous to a subunit shared by the three eucaryal nuclear RNA polymerases.|
|Source||Proc. Natl. Acad. Sci. U.S.A. 89:407-410(1992).|
|2||Authors||Thiru A., Hodach M., Eloranta J.J., Kostourou V., Weinzierl R.O., Matthews S.|
|Title||RNA polymerase subunit H features a beta-ribbon motif within a novel fold that is present in archaea and eukaryotes.|
|Source||J. Mol. Biol. 287:753-760(1999).|