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Unanchored polyubiquitin chains are emerging as important regulators of cellular physiology with diverse roles paralleling those of substrate‐conjugated polyubiquitin. However tools able to discriminate unanchored polyubiquitin chains of different isopeptide linkages have not been reported. We describe the design of a linker‐optimized ubiquitin‐binding domain hybrid (t‐UBD) containing two UBDs, a...
Rat liver pyruvate dehydrogenase (PDH) kinase activator protein (KAP), a free PDH kinase readily separable from PDH complex and its intrinsic kinase, has been purified to apparent homogeneity from liver mitochondria of fed and 48-h starved rats. On SDS-PAGE an apparently single band of M, 45 kDa was obtained. N-Terminal amino acid sequence analyses (8-10 cycles) confirmed the presence of a single...
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