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Surface IgD and IgM doubly positive cells comprise the major population of B cells in the human immune system. The heavy chain of membrane-bound IgD (mδ) differs from that of IgD (δ) in that mδ contains a C-terminal membrane-anchor peptide. Our group previously proposed that the N-terminal extracellular segment of 27 aa residues of the membrane-anchor peptide of mδ, referred to as the mIg isotype-specific-δ...
Various plant developmental processes involve phytohormones such as cytokinins. Isopentenyltransferase (IPT) reaction is the key rate-limiting step in cytokinin biosynthesis that transfers the isopentenyl (iP) group from dimethylallyl diphosphate to the N6-amino group of adenine. Here, a series of diadenosine polyphosphates (Ap n A) were screened as possible substrates of IPT, among which...
Various inositide phosphatases participate in the regulation of inositol polyphosphate signaling molecules. Plant phytases are phosphatases that hydrolyze phytate to less-phosphorylated myo-inositol derivatives and phosphate. The phytase from Selenomonas ruminantium shares no sequence homology with other microbial phytases. Its crystal structure revealed a phytase fold of the dual-specificity phosphatase...
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