Membrane proteins
plasma membrane
structural
leaves
controlswhatenters
support
compartmentalization increased regulation
e
increased
complexity
increased
identification
mmmm
efficiencySIDtags forcell
membrane is mostly constructed of lipids
phospholipids cholesterol a polarhydroxyl
group interacts w head
polar hydrophilichead nonpolar carbon ringsinteract
w tails
fattyacidtails nonpolar
membranefuidity DYNAMIC
c
E kink doublebonds 9fluidity
I fluid
hottertemp
innit.tt tiitaiiIfitgiaity iiii morecholesterol
aridityi
i KMT highertemp
i faster molecule
membrane contains proteins
either receptors transporters enzymes or anchors
two types
peripheralmembrane proteins integral membrane proteins
tempararlyaccociated w
o
2
membrane regions amphipathic
y
d d
interact w phospholipid permanenty accociated in
heads membrane
not embedded
simplediffusion Passive 7conc
ability for molecules to easily go through
membrane w o protein aid
onlyfor small gasses non polar small
molecules equilibria
e 9 lipids like steroids or co
dynamic
net movement of molecules from high low
NOconcentrationgradient dynamic equilibrium t conc
ransport proteins alwaystransmembraneproteins Assteroatmnignconc lowconc
It1 channel proteins
open gated
hydrophilic channelfor specific
É n'formational change
f gatedchannels requirestimulus
too 1 ligand gated chemical
signal2 voltagegated electricle charge difference
2 carrier proteins
depend on if high cows of low high
specific molecule binds to specificprotein
oi moleculethrough
FACILITATEDdiffusion
egglucosltransporterscarrygiooseintomanmetallswhenyd
glucose molecule binds to its protein PASSIVE
enzymeproteins
7 productreleased
either integral or freefloating proteins
requires specific facilitate chemical reactions catalize
carry out metabolic processes
enzyme substrate complex will facilitate hydrolysis or synthesis
when releasing product
enzymes allow change in proteins cellularcommunication
pancreassecreted
and bind toreceptor
by cells for response to happen
Mjg b
to specific liver to take inglucose
proteintosignal
receptor protein site ontargetcell
Target cel released
receptorproteinchangesconformation
message