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• W2044656929 abstract "We have expressed a truncated form of the alpha1 kinase domain of AMP-activated protein kinase (AMPK) in Escherichia coli as a glutathione-S-transferase fusion (GST-KD). A T172D mutant version did not require prior phosphorylation and was utilized for most subsequent studies. We have also created a recombinant substrate (GST-ACC) by expressing 34 residues around the major phosphorylation site (Ser79) on rat acetyl-CoA carboxylase-1/alpha (ACC1) as a GST fusion. This was an excellent substrate that was phosphorylated with similar kinetic parameters to ACC1 by both native AMPK and the bacterially expressed kinase domain. We also constructed a structural model for the binding of the ACC1 sequence to the kinase domain, based on crystal structures for related protein kinases. The model was tested by making a total of 25 mutants of GST-ACC and seven mutants of GST-KD, and measuring kinetic parameters with different combinations. The results reveal that AMPK and ACC1 interact over a much wider region than previously realized (>20 residues). The features of the interaction can be summarised as follows: (i) an amphipathic helix from P-16 to P-5 on the substrate binds in a hydrophobic groove on the large lobe of the kinase; (ii) basic residues at P-6 and P-4 bind to two acidic patches (D215/D216/D217 and E103/D100/E143, respectively), on the large lobe; (iii) a histidine at P+3 interacts with D56 on the small lobe; (iv) the side-chain of P+4 leucine could not be precisely positioned, but a new finding was that asparagine or glutamine could replace a hydrophobic residue at this position. These interactions position the serine residue to be phosphorylated in close proximity to the gamma-phosphate group of ATP. Although based on modelling rather than a determined structure, this represents one of the most detailed studies of the interaction between a kinase and its substrate achieved to date." @default.
• W2044656929 created "2016-06-24" @default.
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• W2044656929 date "2002-03-01" @default.
• W2044656929 modified "2023-09-27" @default.
• W2044656929 title "Protein kinase substrate recognition studied using the recombinant catalytic domain of AMP-activated protein kinase and a model substrate" @default.
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• W2044656929 doi "https://doi.org/10.1006/jmbi.2001.5316" @default.
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