Possible Interaction: Cysteine and Calcium Supplement

“The addition of cysteine to parenteral nutrition (PN) allows for the reduction of the amount of methionine in PN, thereby limiting hepatotoxicity, and acidifies the solution, thereby increasing calcium and phosphate solubility, and potentially improving bone mineralization.”

“The addition of cysteine (as cysteine HCl) to a total parenteral nutrition (TPN) solution enhances calcium and phosphate solubility because cysteine lowers the pH of the solution.”

“The inhibition of corneal collagenase by cysteine was partially reversible by the addition of calcium , indicating that part of its inhibition is due to chelatng.”

“These results indicate that in addition to inhibiting by chelating calcium, cysteine irreversibly inhibits by reducing a disulfide bond in the enzyme molecule.”

“Protective action of Cys was complete only at the lowest concentration of Ni 2+ (125 µ M).”

“4 In the absence of extracellular calcium the AlPcS4‐sensitized smooth muscle did not respond to photon activation but re‐introduction of calcium after cessation of illumination produced a sustained contraction which was markedly inhibited by Cys 10 mm.”

“Micromolar concentrations of copper (Cu2+) and cysteine induce rapid efflux of calcium from sarcoplasmic reticulum (SR) vesicles.”

“ Cysteine , EDTA and Triton X-100 were inhibitory to Ca2+ -uptake.”

“Application of Ca also elevated the level of cysteine (Cys) by upregulating the activity of Cys-synthesizing enzymes serine acetyltransferase and O-acetylserine(thiol)lyase in Cd-stressed seedlings.”

“The chiral induction is strongly dependent upon the pH of the deposition solution; adsorption of penicillamine and cysteine under acidic conditions (pH = 3) induces the same level of optical activity, whereas at pH = 11, the optical activity induced by cysteine is reduced by ca.”

“ CA was the most potent and its effects were significantly reduced by simultaneous additon of l-cysteine , a sulph-hydryl compound.”