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Region found in RelA / SpoT proteins This region of unknown function is found in RelA and SpoT of Escherichia coli, and their homologs in plants and in other eubacteria. RelA is a guanosine 3',5'-bis-pyrophosphate (ppGpp) synthetase (EC:2.7.6.5) while SpoT is thought to be a bifunctional enzyme catalyzing both ppGpp synthesis and degradation (ppGpp 3'-pyrophosphohydrolase, (EC:3.1.7.2)). This region is often found in association with HD (pfam01966), a metal-dependent phosphohydrolase, TGS (pfam02824) which is a possible nucleotide-binding region, and the ACT regulatory domain (pfam01842).
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