Cell culture models widely used in cancer research do not reflect metabolism in tumors; by altering culture systems to better model tumor metabolism we find that environmental cystine promotes tumor glutamine metabolism.
The crystal structure of Norrie Disease Protein in complex with the extracellular cysteine-rich domain of Frizzled4 receptor and sucrose octasulfate reveals binding sites for Frizzled4, low density lipoprotein receptor related protein 5/6, and proteoglycan.
The chloroplast 2-cysteine peroxiredoxin is central player and missing link in the chloroplast thiol-disulfide redox regulatory network, and participates in oxidative inactivation of reductively activated enzymes in photosynthesis.
The major cytosolic yeast peroxiredoxin Tsa1 controls aging and H2O2-resistance by inhibiting protein kinase A through a conserved cysteine in the catalytic subunit activation loop and not by scavenging H2O2.
ATF4, the master regulator of transcription during the Integrated Stress Response (ISR), causes global changes in cysteine sulfhydration of proteins and this event causes cellular metabolic reprogramming.