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Activation loop phosphorylation tunes conformational dynamics underlying Pyk2 tyrosine kinase activation

ABSTRACT: Pyk2 is a multidomain non-receptor tyrosine kinase that undergoes a complex, multi-stage activation process. Ca2+-flux induces conformational rearrangements that relieve autoinhibitory FERM domain interactions. The kinase domain phosphorylates a key linker residue to recruit Src kinase. Pyk2 and Src mutually phosphorylate activation loop residues to confer full activation. While the mechanisms of autoinhibition are established, the conformational dynamics associated with autophosphorylation and Src recruitment remain unclear. Here, we employ hydrogen/deuterium exchange mass spectrometry (HDX-MS) to map the conformational changes associated with Src-mediated activation segment phosphorylation in a Pyk2 construct encompassing FERM and kinase domains (residues 20-692). Results reveal increased dynamics at regulatory interfaces spanning FERM and kinase domains. Phosphorylation of the activation segment stabilizes two antiparallel beta strands linking activation and catalytic loops. Increased dynamics of the C-terminal end of the activation loop propagate to the F-helix, explaining how phosphorylation prevents reversion to the autoinhibitory FERM interaction. HDX-guided site-directed mutagenesis and kinase activity profiling establish a mechanism for phosphorylation-induced active site sculpting to confer high activity.

INSTRUMENT(S): Synapt MS

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Eric Underbakke

LAB HEAD: Eric Steven Underbakke

PROVIDER: PXD034028 | Pride | 2023-03-08

REPOSITORIES: Pride

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Project description:To directly observe the conformational changes in Akt1 3P elicited by PIP 3 binding, we performed HDX-MS analysis of Akt1 3P in the presence of plasma membrane-mimicking liposomes (20% cholesterol, 30% phosphatidylcholine, 15% phosphatidylserine, 35% phosphatidylethanolamine) that contained either 0% or 5% PIP 3 . The sequence coverage of Akt1 was excellent, with 160 peptides spanning ~97% of all exchangeable amides (Supplementary Table 2). With 5% PIP 3 liposomes there was extensive protection of the PH domain, similar to what had been previously observed for non-phosphorylated Akt1. In addition to protection of the PH domain elicited by PIP 3 binding, Akt1 3P exhibited significant deprotection of the C-lobe of the kinase domain, including the activation loop, that corresponds to the interface between the PH and kinase domains observed in our structure of autoinhibited Akt1. We also carriedout HDX-MS experiments in the presence and absence of ATPS, for which we observed no significant differences. The likely binding pocket for the hydrophobic motif is the so-called PDK1- interacting fragment (PIF) pocket in Akt that binds the phosphorylated hydrophobic motif in the active conformation (21, 22) . Previous hydrogen- deuterium exchange mass spectrometry (HDX-MS) analysis of Akt1 DrLink indicated small, but significant exposure of the PIF pocket upon PI(3,4,5)P 3 binding (26) (Figure 5D, deuterium incorporation plots reproduced with permission). We confirmed this observation by comparing the deuterium incorporation rates for Akt1 DrLink and Akt1 ΔC in solution. Sequence coverage of the truncated Akt1 ΔC comprised 85 peptides spanning ~94% of all exchangeable amides (Supplementary Table 2). Two peptides in Akt1 ΔC , corresponding to β3-αB in the N-lobe and the catalytic loop in the C-lobe of the kinase domain exhibited a modest, but significant, 6% increase in deuterium incorporation (Figure 5E). These changes indicate exposure of the PIF pocket and consequent local disordering of the N-lobe in the absence of the hydrophobic motif. These observationsis areis consistent with the lack of electron density observed for theC helix and activation loop and overall higher temperature factors for the N- lobe of the kinase domain (Supplementary Figure S5CD). In order to test whether the unphosphorylated hydrophobic motif indeed binds to the PIF pocket in the inactive conformation, we measured the binding affinity of a tail peptide 19 containing the missing C-terminal tail residues in Akt1 ΔC (residues 457-480 of human Akt1) by fluorescence anisotropy. The binding constant was estimated to be approximately 0.5 mM from three independent titrations (Figure 5F), although it was not possible to reach saturation due to limiting Akt1 ΔC concentration. Whilst this is a relatively weak interaction, it is sufficient in the context of an intramolecular interaction to sequester the hydrophobic motif more than 99% of the time at equilibrium due to the almost infinite local concentration.

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Activation loop phosphorylation tunes conformational dynamics underlying Pyk2 tyrosine kinase activation

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