Metabolic channeling in plants.
The organization of cooperating enzymes into macromolecular complexes is a central feature of cellular metabolism. A major advantage of such spatial organization is the transfer of biosynthetic intermediates between catalytic sites without diffusion into the bulk phase of the cell. This so-called "metabolic channeling" offers unique opportunities for enhancing and regulating cellular biochemistry. Studies in a number of plant primary and secondary metabolic systems continue to contribute to our understanding of the nature and importance of this phenomenon. This article reviews advances in four systems: the cysteine synthase complex, the Calvin cycle, cyanogenic glucoside biosynthesis, and the phenylpropanoid pathway. Each of these systems is providing new evidence for the importance of enzyme organization in cellular biochemistry as well as exclusive insights into the molecular basis of enzyme complex assembly. This review also explores current prospects for understanding metabolon structure, assembly, and biological function.
Winkel
Brenda S J
BS
Department of Biology and Fralin Biotechnology Center, Virginia Tech, Blacksburg, Virginia 24061-0346, USA. winkel@vt.edu
D003547:Cysteine Synthase / Q000737:chemistry / Q000378:metabolism; D046911:Macromolecular Substances / Q000378:metabolism; D008958:Models, Molecular; D009570:Nitriles / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D017434:Protein Structure, Tertiary
D046911:Macromolecular Substances; D009570:Nitriles; D010940:Plant Proteins; D003547:Cysteine Synthase; C011220:dhurrin