<Table> <Tr> <Th_colspan="2"> Aspartate carbamoyltransferase </Th> </Tr> <Tr> <Td_colspan="2"> Aspartate carbamoyltransferase from Escherichia coli . PDB 2ATC . </Td> </Tr> <Tr> <Th_colspan="2"> Identifiers </Th> </Tr> <Tr> <Th> EC number </Th> <Td> 2.1. 3.2 </Td> </Tr> <Tr> <Th> CAS number </Th> <Td> 9012 - 49 - 1 </Td> </Tr> <Tr> <Th_colspan="2"> Databases </Th> </Tr> <Tr> <Th> IntEnz </Th> <Td> IntEnz view </Td> </Tr> <Tr> <Th> BRENDA </Th> <Td> BRENDA entry </Td> </Tr> <Tr> <Th> ExPASy </Th> <Td> NiceZyme view </Td> </Tr> <Tr> <Th> KEGG </Th> <Td> KEGG entry </Td> </Tr> <Tr> <Th> MetaCyc </Th> <Td> metabolic pathway </Td> </Tr> <Tr> <Th> PRIAM </Th> <Td> profile </Td> </Tr> <Tr> <Th> PDB structures </Th> <Td> RCSB PDB PDBe PDBsum </Td> </Tr> <Tr> <Th> Gene Ontology </Th> <Td> AmiGO / QuickGO </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th_colspan="2"> (show) Search </Th> </Tr> <Tr> <Th> PMC </Th> <Td> articles </Td> </Tr> <Tr> <Th> PubMed </Th> <Td> articles </Td> </Tr> <Tr> <Th> NCBI </Th> <Td> proteins </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Aspartate carbamoyltransferase </Th> </Tr> <Tr> <Td_colspan="2"> Aspartate carbamoyltransferase from Escherichia coli . PDB 2ATC . </Td> </Tr>

What molecule acts as a positive effector (activator) of aspartate transcarbamoylase (atcase)