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Mechanism for the regulation of mammalian cGMP phosphodiesterase6. 1: identification of its inhibitory subunit complexes and their roles. | LitMetric
Cyclic GMP phosphodiesterase (PDE) in bovine rod photoreceptor outer segments (OS) comprises a catalytic subunit complex (Palphabeta) and two inhibitory subunits (Pgamma) and is regulated by the alpha subunit of transducin (Talpha). Here, we show an overall mechanism for PDE regulation by identifying Pgamma complexes in OS homogenates prepared with an isotonic buffer. Before Talpha activation, three Pgamma complexes exist in the soluble fraction. Complex a, a minor complex, contains Palphabeta, Talpha, and a protein named Pdelta. Complex b, Palphabetagammagamma( b ), has a PDE activity similar to that of membranous Palphabetagammagamma, Palphabetagammagamma( M ), and its level, although its large portion is Pdelta-free, is estimated to be 20-30% of the total Palphabetagammagamma. Complex c, (Pgamma.GDP-Talpha) (2) ( c ) , appears to be a dimer of Pgamma.GDP-Talpha. Upon Talpha activation, (1) complex a stays unchanged, (2) Palphabetagammagamma( b ) binds to membranes, (3) the level of (Pgamma.GDP-Talpha) (2) ( c ) is reduced as its GTP-form is produced, (4) complex d, Pgamma.GTP-Talpha( d ), is formed on membranes and its substantial amount is released to the soluble fraction, and (5) membranous Palphabetagammagamma, Palphabetagammagamma( M ) and/or Palphabetagammagamma( b ), becomes Pgamma-depleted. These observations indicate that Pgamma as a complex with GTP-Talpha dissociates from Palphabetagammagamma on membranes and is released to the soluble fraction and that Pgamma-depleted PDE is the GTP-Talpha-activated PDE. After GTP hydrolysis, both (Pgamma.GDP-Talpha) (2) ( c ) and Pgamma.GDP-Talpha( d ), without liberating Pgamma, deactivate Pgamma-depleted PDE. The preferential order to be used for the deactivation is membranous Pgamma.GDP-Talpha( d ), solubilized Pgamma.GDP-Talpha( d ) and (Pgamma.GDP-Talpha) (2) ( c ) . Release of Pgamma.GTP-Talpha complexes to the soluble fraction is relevant to light adaptation.
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