Abstract：
:The photooxidizing xanthene dye rose bengal is shown to induce rapid Ca2+ release from skeletal muscle sarcoplasmic reticulum (SR) vesicles. In the presence of light, nanomolar concentrations of rose bengal increase the Ca2+ permeability of the SR and stimulate the production of singlet oxygen (1O2). In the absence of light, no 1O2 production is measured. Under these conditions, higher concentrations of rose bengal (micromolar) are required to stimulate Ca2+ release. Furthermore, removal of oxygen from the release medium results in marked inhibition of the light-dependent reaction rate. Rose bengal-induced Ca2+ release is relatively insensitive to Mg2+. At nanomolar concentrations, rose bengal inhibits [3H]ryanodine binding to its receptor. beta,gamma-Methyleneadenosine 5'-triphosphate, a nonhydrolyzable analog of ATP, inhibits rose bengal-induced Ca2+ release and prevents rose bengal inhibition of [3H]ryanodine binding. Ethoxyformic anhydride, a histidine modifying reagent, at millimolar concentrations induces Ca2+ release from SR vesicles in a manner similar to that of rose bengal. The molecular mechanism underlying rose bengal modification of the Ca2+ release system of the SR appears to involve a modification of a histidyl residue associated with the Ca2+ release protein from SR. The light-dependent reaction appears to be mediated by singlet oxygen.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Stuart J,Pessah IN,Favero TG,Abramson JJdoi
10.1016/0003-9861(92)90024-qsubject
Has Abstractpub_date
1992-02-01 00:00:00pages
512-21issue
2eissn
0003-9861issn
1096-0384pii
0003-9861(92)90024-Qjournal_volume
292pub_type
杂志文章abstract：:The remarkable success of therapeutic applications of immunoglobulin G (IgG) in form of monoclonal antibodies and pooled immunoglobulin G preparations has directed attention to this class of glycoproteins. It is commonly appreciated that oligosaccharides attached to the Fc-region play a critical role in the biological...
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