Lysates (adipocytes 10–20 μg protein, adipose tissue 100–200 μg protein) were incubated with SIK2 or SIK3 antibodies coupled to protein G-Sepharose (GE Healthcare, Little Chalfont, UK), and phosphotransferase activity towards the peptide substrates HDAC5tide or Sakamototide (200 μmol/l, GL Biochem, Shanghai, China) was measured as described previously [25 (link), 32 (link)]. One unit of activity (U) was defined as that which catalysed the transfer of 1 nmol 32P/min to the substrate.
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