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TRANSPORT

TRANSMEMBRAN

DWI NOVITASARI

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 Transfer of material and informationacross membranes

1. Cross-membrane movement of small molecules  Diffusion (passive and facilitated)   Active transport2. Cross-membrane movement of large molecules  Endocytosis  Exocytosis3. Signal transmission across membranes  ell surface receptors

!" Si#nal transduction (e#$ #luca#on % cA&')" Si#nal internaliation (coupled *it+ endocytosis$ e#$t+e

,D, receptor)  &ove-ent to intracellular receptors (steroid +or-ones. a

for- of diffusion)4. Intercellular contact and communication

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Difusi sederhana

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Difusi terfasilitasi

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 T+ree types of carrier/-ediated transport

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KLASIFIKASI SISTEM TRANSPORT

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 Trasnortasi asif 

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One !a" in !hich a #lucose carrier canbe dri$en b" a Na% #radient&

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KLASIFIKASI TRANSPORTER

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Difusi b" channels  proteins

Channels  proteins  memun"ai ' sifat(

  Ion)selecti$e ermiabel

  Gated channels can be *uctuate

bet!een oen and closed

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 Transort ion natrium dan +alium melalui saluran rotein

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 The #atin# of ion channels

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Transport aktif :

(a) coupled carrier:

gerakan elektron

(b) ATP-driven:

hidrolisis ATP

(c) light-driven:

energi cahaya

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 Transortasi a+tif 

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Endositosis

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E+sositosis

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Endositosis danE+sositosis

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Si#nal internali,ation