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PDOC00651
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1995-07-26
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* Prokaryotic transcription elongation factors signatures *
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Bacterial proteins greA and greB [1] are necessary for efficient RNA
polymerase transcription elongation past template-encoded arresting sites.
Arresting sites in DNA have the property of trapping a certain fraction of
elongating RNA polymerases that pass through, resulting in locked DNA/RNA/
polymerase ternary complexes. Cleavage of the nascent transcript by cleavage
factors, such as greA or greB, allows the resumption of elongation from the
new 3'terminus. GreA induces cleavage 2 or 3 nucleotides behind the terminus
while greB releases longer sequences up to 9 nucleotides in length.
GreA and greB are related proteins of about 160 amino-acid residues. We have
developed two signature patterns for this protein family. The first
corresponds to a conserved region in the N-terminal section, the second to a
region in the C-terminal section.
-Consensus pattern: T-x(2)-G-x(2)-K-L-x(2)-E-L-x(2)-L-x(4)-R
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Consensus pattern: S-[LIVM]-x-S-P-[LIVM]-A-[KR]-x-[LIVM](2)-x-K-x(3)-D
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Last update: October 1993 / First entry.
[ 1] Borukhov S., Sagitov V., Goldfarb A.
Cell 72:459-466(1993).