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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: zool3 on June 05, 2011, 09:53:03 pm

Title: G protein, second messenger, relay molecules?
Post by: zool3 on June 05, 2011, 09:53:03 pm

hey im a bit confused between these molecules..G protein, second messenger, relay molecules. can someone please explain the differences.

Thanks in advance!

Title: Re: G protein, second messenger, relay molecules?
Post by: seth_129 on June 06, 2011, 03:35:04 pm

A G protein is an example of a secondary messenger molecule that is involved in signal transduction for protein derived of hormones, which interact with surface receptors and require secondary messenger molecules to take their message to the nucleus to enact a response.

Title: Re: G protein, second messenger, relay molecules?
Post by: zool3 on June 06, 2011, 05:02:19 pm

ohh okay thanks for that! :)

Title: Re: G protein, second messenger, relay molecules?
Post by: HERculina on June 06, 2011, 07:23:08 pm

i thought that G proteins werent secondary messengers... O.O
second messengers are usually non-protein.

Title: Re: G protein, second messenger, relay molecules?
Post by: Keo on June 06, 2011, 11:17:14 pm

G-protein's aren't secondary messages, they are more of an activation molecule. They initiate signal transduction causing a cascade of events which activates a whole lot of things such as enzyme production and the production of cAMP.

Title: Re: G protein, second messenger, relay molecules?
Post by: zool3 on June 07, 2011, 05:49:12 pm

then what are cAMP and second messengers :S

Title: Re: G protein, second messenger, relay molecules?
Post by: Truck on June 07, 2011, 07:02:11 pm

Cyclic AMP is a secondary messenger. The function of secondary messengers = signal amplification. Essentially, the hormone will bind to the receptor on the cell's membrane, which triggers the G-Protein which in turn will activate the associated secondary messenger thus initiating signal transduction.

Title: Re: G protein, second messenger, relay molecules?
Post by: zool3 on June 07, 2011, 09:00:10 pm

ohhhh i get it now! thanks heaps guys :D