1vbg

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spinqualitylabelsall models 1vbg, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Pyruvate Phosphate Dikinase from Maize

Overview

Pyruvate phosphate dikinase (PPDK) reversibly catalyzes the conversion of, ATP, phosphate, and pyruvate into AMP, pyrophosphate, and, phosphoenolpyruvate (PEP), respectively. Since the nucleotide binding site, (in the N-terminal domain) and the pyruvate/PEP binding site (in the, C-terminal domain) are separated by approximately 45 A, it has been, proposed that an intermediary domain, called the central domain, swivels, between these remote domains to transfer the phosphate. However, no direct, structural evidence for the swiveling central domain has been found. In, this study, the crystal structures of maize PPDK with and without PEP have, been determined at 2.3 A resolution. These structures revealed that the, central domain is located near the pyruvate/PEP binding C-terminal domain, in contrast to the PPDK from Clostridium symbiosum, wherein the central, domain is located near the nucleotide-binding N-terminal domain., Structural comparisons between the maize and C. symbiosum PPDKs, demonstrated that the swiveling motion of the central domain consists of a, rotation of at least 92 degrees and a translation of 0.5 A. By comparing, the maize PPDK structures with and without PEP, we have elucidated the, mode of binding of PEP to the C-terminal domain and the induced, conformational changes in the central domain.

About this Structure

1VBG is a Single protein structure of sequence from Zea mays with MG and SO4 as ligands. Active as Pyruvate, phosphate dikinase, with EC number 2.7.9.1 Full crystallographic information is available from OCA.

Reference

Crystal structures of pyruvate phosphate dikinase from maize revealed an alternative conformation in the swiveling-domain motion., Nakanishi T, Nakatsu T, Matsuoka M, Sakata K, Kato H, Biochemistry. 2005 Feb 1;44(4):1136-44. PMID:15667207

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