>cd04876 ACT_RelA-SpoT ACT domain found C-terminal of the RelA/SpoT domains. ACT_RelA-SpoT: the ACT domain found C-terminal of the RelA/SpoT domains. Enzymes of the Rel/Spo family enable bacteria to survive prolonged periods of nutrient limitation by controlling guanosine-3'-diphosphate-5'-(tri)diphosphate ((p)ppGpp) production and subsequent rRNA repression (stringent response). Both the synthesis of (p)ppGpp from ATP and GDP(GTP), and its hydrolysis to GDP(GTP) and pyrophosphate, are catalyzed by Rel/Spo proteins. In Escherichia coli and its close relatives, the metabolism of (p)ppGpp is governed by two homologous proteins, RelA and SpoT. The RelA protein catalyzes (p)ppGpp synthesis in a reaction requiring its binding to ribosomes bearing codon-specified uncharged tRNA. The major role of the SpoT protein is the breakdown of (p)ppGpp by a manganese-dependent (p)ppGpp pyrophosphohydrolase activity. Although the stringent response appears to be tightly regulated by these two enzymes i

Probab=97.80  E-value=0.00018  Score=51.45  Aligned_cols=69  Identities=12%  Similarity=0.136  Sum_probs=57.8

Q ss_pred             EEEEECCCCCHHHHHHHHHHHCCCCEEEEEECCCCCCCCEEEEEEEEEECCHHHHHHHHHHHHCCCCCCCC
Q ss_conf             99992488874899999988669957888822677877613599992104889999999986238300047
Q gi|254780900|r  356 IRLTIRNFEGILDKITSQMSDFNISLRLFSCPHQEENSQEFSVFMITHKVSGKLIRDAIECFNGKSDAIRY  426 (438)
Q Consensus       356 LRl~v~DkpGVLa~It~ilak~~ISIesi~Q~~~~~~~~~~~IViiTh~~~e~~i~~ai~~i~~l~~v~~~  426 (438)
T Consensus         1 i~I~~~Dr~GlL~dI~~~is~~~~nI~~v~~~~~~--~~~~~~~~~v~V~d~~~L~~li~~l~~i~~V~~V   69 (71)
T cd04876           1 IRVEAIDRPGLLADITTVIAEEKINILSVNTRTDD--DGLATIRLTLEVRDLEHLARIMRKLRQIPGVIDV   69 (71)
T ss_pred             CEEEEECCCCHHHHHHHHHHHCCCCEEEEEEEECC--CCEEEEEEEEEECCHHHHHHHHHHHHCCCCCEEE
T ss_conf             99999837787999999999879967999999758--9869999999988999999999998779991598