Experimental observations showed that grain growth can be related to ¯¯¯Dlim, a theoretical grain size limit that accounts for the time dependent pinning contribution from the full primary γ′ precipitate size distribution.
To test this idea and to restore the mutant PIN2 protein in the cell, we applied auxin (1-naphthaleneacetic acid, NAA) to inhibit clathrin-dependent PIN endocytosis from the PM [ 33], MG132 to inhibit ubiquitylation/proteasome-mediated PIN internalization and degradation [ 34, 35], and wortmannin to inhibit the vacuolar lytic pathway [ 36].
Through tissue-specific expression of GNOM in gnom mutant embryos, Wolters et al. [ 78] showed that both apical and basal embryo organization depend on GNOM provascular expression, and proposed that GNOM-dependent PIN relocalization (cell-autonomous) and sink-driven auxin transport (non cell-autonomous) trigger the initiation of auxin transport routes in embryonic pattern formation.
Thus, the essential phosphosites required for PID-dependent PIN activation and PIN polarity changes are retained in PIN1 S4A.
We furthermore demonstrated that D6PK-dependent PIN activation was dependent on specific phosphosites in PIN1 and PIN3.
Thus, it can be speculated that also D6PK-dependent PIN phosphorylation is antagonized by phosphatases, the identities of which remain to be determined.
Thus, the response of exocyst mutant roots to exogenous hormone manipulation and auxin transport inhibition were not consistent with the hypothesis that exocyst-dependent PIN trafficking was the primary driver for the reduced root growth rate in exocyst mutants.
Besides phosphorylations at S1, which are not affected in d6pk012 mutants, S2 and S3 would be other possible target sites since their mutation further impairs D6PK-dependent PIN phosphorylation in vitro and auxin transport in the oocyte system.
As auxin regulates PIN1 and PIN2 degradation, the non-linear part of the degradation rate f([ a]) was defined as: (8) where q3,PIN are the thresholds of auxin-dependent PIN degradation, and h PIN are the coefficients that define non-linearity of auxin-regulated PIN inhibition.
The evolution of the volume fractions and mean particle sizes of NbC and TiN leads to a time-dependent pinning pressure that is coupled with the proposed grain growth model to successfully describe the observed kinetics of austenite grain growth.
Interestingly, the anti-inflammatory effects of juglone were not dependent on Pin 1 blockade in the UUO model.
