G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs) are two basic receptor types by which cells transduce signals. Classify each statement as describing GPCRs, RTKs, both types of receptors, or neither. GPCRs structure contains seven transmembrane helices activate heterotrimeric G proteins directly ligand binding induces conformational change in receptor an example is the epinephrine receptor RTKs receptor activation causes phosphorylation of its cytosolic subunits an example is the insulin receptor autophosphorylation of receptor can initiate signal Both phosphorylation of receptor can terminate signal or desensitize receptor Neither transports some ligands through the membrane

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs) are two basic receptor types by which cells
transduce signals. Classify each statement as describing GPCRs, RTKs, both types of receptors, or neither.
Incorrect
GPCRs
structure contains seven
transmembrane helices
activate heterotrimeric G
proteins directly
ligand binding induces
conformational change
in receptor
an example is the
epinephrine receptor
RTKs
receptor activation causes
phosphorylation of its
cytosolic subunits
an example is the
insulin receptor
autophosphorylation of receptor
can initiate signal
Both
phosphorylation of receptor can
terminate signal or
desensitize receptor
Answer Bank
Neither
transports some ligands through
the membrane
Transcribed Image Text:G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs) are two basic receptor types by which cells transduce signals. Classify each statement as describing GPCRs, RTKs, both types of receptors, or neither. Incorrect GPCRs structure contains seven transmembrane helices activate heterotrimeric G proteins directly ligand binding induces conformational change in receptor an example is the epinephrine receptor RTKs receptor activation causes phosphorylation of its cytosolic subunits an example is the insulin receptor autophosphorylation of receptor can initiate signal Both phosphorylation of receptor can terminate signal or desensitize receptor Answer Bank Neither transports some ligands through the membrane
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