Two variants of the enzyme are produced: (a) a glycosylated form (regulated by glucose repression) that is secreted into the periplasmic space, and (b) a non-glycosylated variant that is constitutively produced and present within the cytosol.
Zhang et al. [59] investigated how different sizes, morphology, and surface modification of TiO2 NPs in rutile form regulated their toxic effects on the brain after CD-1 (ICR) female mice were exposed by intranasal instillation every other day for 30 days.
The existence of cortactin in a "closed" versus "open" form regulated by S405/418 phosphorylation has been proposed to explain the observed 80 to 85 kDa shift [15], [40].
These observations raised the question whether specific soluble α-Syn forms, potentially oligomeric forms, regulate catalase activity.
The cycling between active GTP-bound forms and inactive GDP-bound forms regulates the function of small GTPases, such as Arl1.
Interestingly, studies in cultured cells suggest that the two forms regulate hepcidin expression reciprocally by competing for a receptor binding site [ 14].
Classical FcRs regulate B cell responses by binding to the IgG and IgE immune complexes, whereas KIRs, or at least their inhibitory forms, regulate NK cell function by binding specifically to MHC class I molecules.
ROPs cycle between the GTP-binding form and the GDP-binding form, thus regulating a variety of cellular responses [ 24].
These GTPases cycle between an active GTP-bound form and inactive GDP-bound form, and regulate a variety of cytoskeletal molecules [8], [9].
The specific protein composition of cholesterol ester droplets is unknown, and besides ACAT1, specific factors for forming and regulating cholesterol esters LDs are unknown.
