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ACT
Crystal structure of E. coli aspartokinase iii in complex with aspartate and adp (r-state)
Identifiers
Symbol	ACT
Pfam	PF01842
Pfam clan	CL0070
InterPro	IPR002912
SCOP2	1psd / SCOPe / SUPFAM
CDD	cd02116
Available protein structures: Pfam   structures / ECOD   PDB RCSB PDB; PDBe; PDBj PDBsum structure summary

In molecular biology, the ACT domain is a protein domain that is found in a variety of proteins involved in metabolism. ACT domains are linked to a wide range of metabolic enzymes that are regulated by amino acid concentration. The ACT domain is named after three of the proteins that contain it: aspartate kinase, chorismate mutase and TyrA. The archetypical ACT domain is the C-terminal regulatory domain of 3-phosphoglycerate dehydrogenase (3PGDH), which folds with a ferredoxin-like topology. A pair of ACT domains form an eight-stranded antiparallel sheet with two molecules of allosteric inhibitor serine bound in the interface. Biochemical exploration of a few other proteins containing ACT domains supports the suggestions that these domains contain the archetypical ACT structure.

The ACT domain was discovered by Aravind and Koonin using iterative sequence searches.

References

1. Chipman DM, Shaanan B (December 2001). "The ACT domain family". Current Opinion in Structural Biology. 11 (6): 694–700. doi:10.1016/S0959-440X(01)00272-X. PMID 11751050.
2. Aravind L, Koonin EV (April 1999). "Gleaning non-trivial structural, functional and evolutionary information about proteins by iterative database searches". Journal of Molecular Biology. 287 (5): 1023–40. doi:10.1006/jmbi.1999.2653. PMID 10222208.

• Protein domains