1kjq

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spinqualitylabelsall models PDB ID 1kjq Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
, resolution 1.05Å
Ligands:	, , , , and
Gene:	PURT (Escherichia coli)
Coordinates:	save as pdb, mmCIF, xml

Crystal structure of glycinamide ribonucleotide transformylase in complex with Mg-ADP

Overview

PurT-encoded glycinamide ribonucleotide transformylase, or PurT transformylase, functions in purine biosynthesis by catalyzing the formylation of glycinamide ribonucleotide through a catalytic mechanism requiring Mg(2+)ATP and formate. From previous x-ray diffraction analyses, it has been demonstrated that PurT transformylase from Escherichia coli belongs to the ATP-grasp superfamily of enzymes, which are characterized by three structural motifs referred to as the A-, B-, and C-domains. In all of the ATP-grasp enzymes studied to date, the adenosine nucleotide ligands are invariably wedged between the B- and C-domains, and in some cases, such as biotin carboxylase and carbamoyl phosphate synthetase, the B-domains move significantly upon nucleotide binding. Here we present a systematic and high-resolution structural investigation of PurT transformylase complexed with various adenosine nucleotides or nucleotide analogs including Mg(2+)ATP, Mg(2+)-5'-adenylylimidodiphosphate, Mg(2+)-beta,gamma-methyleneadenosine 5'-triphosphate, Mg(2+)ATPgammaS, or Mg(2+)ADP. Taken together, these studies indicate that the conformation of the so-called "T-loop," delineated by Lys-155 to Gln-165, is highly sensitive to the chemical identity of the nucleotide situated in the binding pocket. This sensitivity to nucleotide identity is in sharp contrast to that observed for the "P-loop"-containing enzymes, in which the conformation of the binding motif is virtually unchanged in the presence or absence of nucleotides.

About this Structure

1KJQ is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

PurT-encoded glycinamide ribonucleotide transformylase. Accommodation of adenosine nucleotide analogs within the active site., Thoden JB, Firestine SM, Benkovic SJ, Holden HM, J Biol Chem. 2002 Jun 28;277(26):23898-908. Epub 2002 Apr 12. PMID:11953435

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