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Reg of Enzyme Activi

WVSOM Class of 2012 Regulation of Enzyme Activity

QuestionAnswer
3 methods for enzyme regulation? allosteric, covalent modification, and transcriptional regulation
what groups disrupt conformational change and are important in covalent modification? kinases and phosphatases
when pk is phosphorylated, is it active or not? inactive
what happens to the insulin receptor and glycogen phosphorylase when they are phosphorylated? they become active
what is reponsible for the fight or flight reflex? glycogen phosphorylase
protein kinase A is what kind or regulator? covalent modification
glycosylation does what to protein groups? adds a carbohydrate
to add a protein to a membrane, what should be added? a fatty acid
acetylation is important to what regulation? histone
amino acid modification examples include: glycosylation, fatty acid prenylation
what do matrix metalloproteases do? enzymes that degrade extracellular matrix proteins
what is a t.i.m.p.? tissue inhibitor of metalloproteases
what is a zymogen? inactive protein
what can activate a zymogen? proteolysis
this process is used in nuclear proteins and is simliar to ubiquitinization? sumoylation
in transcriptional control, what reactions can be controlled? transcription, translation, or degradation
in eukaryotic cells, what can regulate enzymes? feedback and feedforward; isoenzymes
is the rate regulating step reversible? no
feedforward has an increased supply of what? name an example: substrate; glycogen/insulin system
isoenzymes have similar actions; are their structures the same or different? different
what are examples of isoenzymes? glucokinase, hexokinase
what do multienzymes do? give an example: transfer substrate to adjacent enzyme; microsomal ethanol oxidizing system (MEOS)
what are some examples of regulation via proteolysis? coagulation factors and chymotrypsin
feedback regulation is most often an example of what kind of regulation? allosteric
give an example of compartmentalization: TCA
Created by: mhassan
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