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Q: Does G protein act as a second messenger?
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What is the link between a first messenger and a second messenger in a cell that responds to peptide hormones?

g protein


What process would you expect the colloid to exit the thyroid cell?

Though a second messenger or receptor and then a g-protein casing signal transduction


What is the second stage of making a protein?

fartin**g .....0001+2


What is the difference of g-protein receptor system and tyrosine kinase receptor?

Receptor tyrosine kinases do not require the use of second messengers while G protein-coupled receptors need.


Why g protein are coupled receptors?

The receptor it self is a trans-membrane protein and doesn't act as an ion channel further more the G-protein involves several functions by its different subunits (G-alph: activation of PLC and adenylcyclase. and G-beta,gamma: activation of potassium channel) and the receptor is coupled with more than one G-protein which lead to amplification of the signal. So G-protein could be possibly evolved to do several functions and amplify them by one receptor


Who got noble prize for discovering G protein?

G proteins were discovered when Alfred G. Gilman and Martin Rodbell investigated stimulation of cells by adrenaline. They found that, when adrenaline binds to a receptor, the receptor does not stimulate enzymes directly. Instead, the receptor stimulates a G protein, which stimulates an enzyme. An example is adenylate cyclase, which produces the second messenger cyclic AMP. For this discovery, they won the 1994 Nobel Prize in Physiology or Medicine.


Is protein in sweetcorn?

3.2 g of protein in 100 g of sweetcorn.


What are two important second messengers used in the G protein-linked receptor mechanism?

i think its calcium ions


What activates a G protein?

GTP activates a G-protein when it displaces the GDP.


Why are G-protein-gated ion channels called the shortcut pathway?

All action of neurotransmitter is eventually (mostly) manifest in the regulation of ion in nerve cell, to decide when to fire or not an action potential. Regulation of ion utilize the ion channel, and there are three (known) mechanism which affect the opening and closing of an ion channel : 1) direct influence - ion channel which is directly activated by neurotransmitter attached to them, this one is called ¨Transmitter Gated Channel¨ 2) shortcut pathways - ion channel which is activated by G-protein, this is called the ¨G-protein-gated ion channels¨ 3) second messenger cascades - G-protein trigger a chain reaction of chemical through enzyme or other class of protein and finally affect the opening and closing of ion channels


The second-messenger mechanism of hormone action operates by?

Binding to specific receptors and employing the services of G proteins and cAMP.


Why G protein linked receptor is called as G protein linked receptor?

sciece