3aqm | pdb_00003aqm

Structure of bacterial protein (form II)

spinqualitylabelsall models 3aqm, resolution 3.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3aqm is a 2 chain structure with sequence from Escherichia coli dh1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG Related: 3aqk, 3aql, 3aqn Gene: EcDH1_3459 (Escherichia coli DH1) Activity: Polynucleotide adenylyltransferase, with EC number 2.7.7.19 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed PolyA polymerase (PAP) adds a polyA tail onto the 3'-end of RNAs without a nucleic acid template, using adenosine-5'-triphosphate (ATP) as a substrate. The mechanism for the substrate selection by eubacterial PAP remains obscure. Structural and biochemical studies of Escherichia coli PAP (EcPAP) revealed that the shape and size of the nucleobase-interacting pocket of EcPAP are maintained by an intra-molecular hydrogen-network, making it suitable for the accommodation of only ATP, using a single amino acid, Arg(197). The pocket structure is sustained by interactions between the catalytic domain and the RNA-binding domain. EcPAP has a flexible basic C-terminal region that contributes to optimal RNA translocation for processive adenosine 5'-monophosphate (AMP) incorporations onto the 3'-end of RNAs. A comparison of the EcPAP structure with those of other template-independent RNA polymerases suggests that structural changes of domain(s) outside the conserved catalytic core domain altered the substrate specificities of the template-independent RNA polymerases. Mechanism for the alteration of the substrate specificities of template-independent RNA polymerases.,Toh Y, Takeshita D, Nagaike T, Numata T, Tomita K Structure. 2011 Feb 9;19(2):232-43. PMID:21300291 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Poly(A) Polymerase

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