PROSITE documentation PDOC00444
Adenylosuccinate synthetase signatures


Adenylosuccinate synthetase (EC [1] plays an important role in purine biosynthesis, by catalyzing the GTP-dependent conversion of IMP and aspartic acid to AMP. Adenylosuccinate synthetase has been characterized from various sources ranging from Escherichia coli (gene purA) to vertebrate tissues. In vertebrates, two isozymes are present - one involved in purine biosynthesis and the other in the purine nucleotide cycle.

As signature patterns, we selected two conserved regions. The first one is a perfectly conserved octapeptide located in the N-terminal section and which is involved in GTP-binding [2]. The second one includes a lysine residue known [2] to be essential for the enzyme's activity.

Last update:

December 2004 / Pattern and text revised.


Technical section

PROSITE methods (with tools and information) covered by this documentation:

ADENYLOSUCCIN_SYN_1, PS01266; Adenylosuccinate synthetase GTP-binding site  (PATTERN)

ADENYLOSUCCIN_SYN_2, PS00513; Adenylosuccinate synthetase active site  (PATTERN)


1AuthorsWiesmueller L. Wittbrodt J. Noegel A.A. Schleicher M.
SourceJ. Biol. Chem. 266:2480-2485(1991).

2AuthorsSilva M.M. Poland B.W. Hoffman C.R. Fromm H.J. Honzatko R.B.
TitleRefined crystal structures of unligated adenylosuccinate synthetase from Escherichia coli.
SourceJ. Mol. Biol. 254:431-446(1995).
PubMed ID7490761

3AuthorsBouyoub A. Barbier G. Forterre P. Labedan B.
TitleThe adenylosuccinate synthetase from the hyperthermophilic archaeon Pyrococcus species displays unusual structural features.
SourceJ. Mol. Biol. 261:144-154(1996).
PubMed ID8757283

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