Evolutionary conservation and adaptation in the mechanism that regulates SREBP action: what a long, strange tRIP it's been.
Sterol regulatory element-binding proteins (SREBPs) are a subfamily of basic helix-loop-helix leucine zipper (bHLH-LZ) transcription factors that are conserved from fungi to humans and are defined by two key features: a signature tyrosine residue in the DNA-binding domain, and a membrane-tethering domain that is a target for regulated proteolysis. Recent studies including genome-wide and model organism approaches indicate SREBPs coordinate cellular lipid metabolism with other cellular physiologic processes. These functions are broadly related as cellular adaptation to environmental changes ranging from nutrient fluctuations to toxin exposure. This review integrates classic features of the SREBP pathway with newer information regarding the regulation and sensing mechanisms that serve to assimilate different cellular physiologic processes for optimal function and growth.
Osborne
Timothy F
TF
Department of Molecular Biology and Biochemistry, University of California at Irvine, Irvine, California 92697, USA. tfosborn@uci.edu
Espenshade
Peter J
PJ
D000222:Adaptation, Physiological; D000818:Animals; D004721:Endoplasmic Reticulum / Q000378:metabolism; D019143:Evolution, Molecular; D005786:Gene Expression Regulation; D006801:Humans; D007328:Insulin / Q000378:metabolism; D050356:Lipid Metabolism; D023421:Models, Animal; D010100:Oxygen / Q000378:metabolism; D010802:Phylogeny; D012568:Schizosaccharomyces / Q000378:metabolism; D051779:Sterol Regulatory Element Binding Proteins / Q000378:metabolism*
D007328:Insulin; D051779:Sterol Regulatory Element Binding Proteins; D010100:Oxygen