Membran sel dan transport - Universitas...
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MEMBRAN SEL DAN TRANSPORT
Agustina Setiawati, M.Sc., Apt
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MODEL MEMBRAN
Fluid Mosaic Model 1972 Singer & Nicolson : lipid diatur dlm struktur 2 lapis dg protein yg berbeda2 tertanam / menempel pada lipid (mosaik), dimana protein & fosfolipid dpt bergerak bebas pada membran (fluid).
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Fluid Mosaic Membrane
Text pg 80
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Komponen Membran Sel
Fosfolipid
Kolesterol
Karbohidrat: Glikolipid & Glikoprotein
Protein membran
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1. FOSFOLIPID
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FOSFOLIPID PADA MAMALIA
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Gerakan Fosfolipid
Difusi lateral
Flip-Flop
Rotasi
Fleksi
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2. KOLESTEROL
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3. Karbohidrat Membran
Berupa asam sialat (NANA)
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Fungsi Karbohidrat Membran
Beperan penting dalam identifikasi sel
Membedakan sel satu dengan yg lain (antigen)
Berperan penting dlm perkembangan jaringan dan organ
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4. Protein membran
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PROTEIN MEMBRAN
Mempunyai fungsi yang spesifik
PROTEIN PERIFER
Terikat pada permukaan membran sel
Penanda spesifik untuk sel (ANTIGEN)
PROTEIN INTEGRAL/TRANSMEMBRAN
Menembus membran sel Sebagai protein transport
Kanal, pompa ion
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2007-2008
ASAM AMINO APA SAJA YANG MENYUSUN PROTEIN MAMBRAN?
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KELAS ASAM AMINO
nonpolar & hidrofobik
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polar &hidrofilik
I like the polar ones the best!
KELAS ASAM AMINO
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ASAM AMINO dalam PROTEIN MEMBRAN
Dalam membran asam amino nonpolar hidrofobik
Tertanam dalam membran
Permukaan Membran
asam amino polar
hidrofilik
Berada di luar (menghadap ke lingkungan luar atau sitoplasma)
Polar areas of protein
Nonpolar areas of protein
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FUNGSI PROTEIN MEMBRAN SEL
Outside
Plasma membrane
Inside
Transporter Reseptor Sebagai ENZIM
Penanda spesifik Pelekatan Sitoskeleton
Adhesi SEL
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Dibedakan menjadi 2:
1. GLIKOLIPID
2. GLIKOPROTEIN
KARBOHIDRAT MEMBRAN
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Glikolipid dan Glikoprotein?
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Bagaimana molekul melintasi membran?
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Permiabilitas Membran Sel
Membran plasma mempunyai permiabilitas yang berbeda thp molekul yg berbeda
Makromolekul (protein, karbohidrat, lipid) tidak bisa melintasi membran, why?
Molekul kecil bermuatan tidak bisa melintasi membran, why??
Molekul kecil tidak bermuatan dapat melintasi membran berdasar gradien konsentrasi
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Tipe Transport Seluler
Transport pasif
Sel tidak butuh energi
1. Difusi
2. Difusi Terfasilitasi
3. Osmosis
Transport aktif
Sel butuh energi
1. Pompa protein
2. Endositosis
3. Eksositosis
high
low
This is gonna
be hard work!!
high
low
Weeee!!!
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TRANSPOR PASIF
Sel tidak butuh energi
Molekul bergerak secara acak
Molekul bergerak dari konsentrasi tinggi ke rendah
(TinggiRendah)
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1. Difusi
2. Difusi terfasilitasi– difusi yang diperantarai protein membran
3. Osmosis – difusi air
TRANSPOR PASIF
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1. DIFUSI
http://bio.winona.edu/berg/Free.htm
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AS Biology, Cell membranes and Transport
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FAKTOR yang mempengaruhi Kecepatan Difusi
1. Gradien konsentrasi
Makin besar gradien konsentrasi semakin cepat difusi
2. Suhu
makin tinggi suhu, makin tinggi energi kinetik molekul sehingga probabilitas difusi lebih besar
3. Luas permukaan difusi
makin luas permukaan difusi semakin banyak molekul yg berdifusi
4. Tipe molekul/ion yang berdifusi
Molekul yang lebih besar lebih sulit berdifusi
Molekul non polar/hidrofobik lebih mudah berdifusi karena larut dalam ekor non polar fosfolipid.
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AS Biology, Cell membranes and Transport
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MOLEKUL yang ditransport secara DIFUSI
1. Oxygen – Non-polar so diffuses very quickly.
1. Carbon dioxide – Polar but very small so diffuses quickly.
2. Water – Polar but also very small so diffuses quickly.
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Gas exchange in lungs by diffusion
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2. DIFUSI TERFASILITASI: difusi melalui protein membran, yg disebut protein transport
a. Protein transport bersifat SPESIFIK– hanya molekul tertentu yg dpt melewati membran
b. Mentransport molekul besar atau bermuatan
2. DIFUSI TERFASILITASI
Carrier Protein
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Konsentrasi TINGGI
GLUKOSA
Protein channel
Go to Section:
ProteinTransport
High
Low Konsentrasi RENDAH
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Transpoter glukosa (GluT)
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TIPE PROTEIN TRANSPORT
3 Tipe Protein Transport:
1. uniport
2. symport
3. antiport
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ProteinTransport Uniport
extracellular
fluid
intracellular fluid
Membawa 1 jenis molekul melewati membran
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Memindahkan 2 molekul berbeda secara bersamaan
ke arah yang sama
intracellular
fluid
extracellular
fluid
ProteinTransport Symport
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Menukarkan 2 molekul berbeda dengan
arah yang berlawanan
intracellular
fluid
extracellular
fluid
ProteinTransport Antiport
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Osmosis animation Osmosis
Difusi air melewati membran sel yang disebabkan gradien konsentrasi disebut osmosis.
Difusi selalu terjadi dari konsentrasi tinggi ke rendah.
Air masuk ke dalam sel karena tekanan osmosis dalam sel.
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Osmosis
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Larutan HIPOTONIS
Hipotonis: Larutan yang konsentrasi solut lebih rendah atau konsentrasi airnya lebih tinggi dibandingkan konsentrasi air dalam sel . (Low solute; High water)
Hasil : Air ber-osmosis dari larutan ke dalam sel—Sel menggelembung dan PECAH (cytolysis)!
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Larutan Hipertonis
Hipertonis: Larutan yang mempunyai konsentrasi
zat terlarut lebih tinggi atau konsentrasi air lebih rendah dibandingkan dalam sel. (tinggi solut; rendah air)
Hasil : Air keluar dari sel ke larutan: Sel mengkerut (Plasmolysis)!
shrinks
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Isotonic Solution
Isotonic: Larutan yang mempunyai konsentrasi solut dan air yang sama dengan sel
Result: Air bergerak dengan jumlah sama dan seimbang ke dalam/keluar sel! (Dynamic Equilibrium)
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Tipe larutan apakah yang menyebabkan seperti ini?
A C B
Hypertonic Isotonic Hypotonic
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Sel tumbuhan
Apabila sel tumbuhan berada dalam
lingkungan hipotonis disebutTURGID.
Prosesnya disebut TEKANAN TURGOR.
Water
Central
Vacuole
Water
Water Water
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Apabila sel tumbuhan berada dalam lingkungan
hipertonis, membran plasma terlepas dari dinding
sel (vakuola kosong)
Proses kehilangan air ini disebut PLASMOLYSIS
Water
Water
Cell
Wall Water
plasma membrane
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TRANSPORT AKTIF
•Sel butuh ENERGI dalam bentuk ATP
• Molekul bergerak dari konsentrasi RENDAH ke TINGGI
•(RENDAH TINGGI)
• Ada 3 tipe:
1. Pompa protein
2. Endositosis
3. Eksositosis
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Transport Aktif—Pompa Protein
Membutuhkan protein membran utk mentransport molekul
Contoh:
Pompa Natrium Kalium
Pompa Na/K ATP-ase
Protein membutuhkan energi untuk mengubah bentuk saat transport : proses ini butuh energy!
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Proses transport aktif melalui pompa protein
Figure 5.18
Transport
protein
1
FLUID
OUTSIDE
CELL
First
solute
First solute,
inside cell,
binds to protein
Phosphorylated
transport protein
2 ATP transfers
phosphate to
protein
3 Protein releases
solute outside
cell
4 Second solute
binds to protein
Second
solute
5 Phosphate
detaches from
protein
6 Protein releases
second solute
into cell
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Contoh pompa protein transport aktif
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Mengambil material yg besar dari luar ke dalam sel
Butuh energi
Membentuk vakuola makanan atau endosom
Transport Aktif—Endositosis
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3 types Endositosis:
A. Fagositosis
B. Pinositosis
C. Receptor-mediated endocytosis
What are differences among them?
2. Transport Aktif—Endositosis
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56
FAGOSITOSIS
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57
PINOSITOSIS
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Receptor Mediated Endocytosis
Harmful levels of cholesterol can accumulate in the blood if membranes lack cholesterol receptors
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3. Proses pengeluaran material dari dalam sel • Material diselimuti
membran menyatu dengan membran plasma sel
• Sel berubah bentuk memerlukan energi
• EX: Pelepasan Hormon atau sampah dari dalam sel
2. Transport Aktif—Eksoositosis
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AS Biology, Cell membranes and Transport
60
Transport Membran Sel
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