STRUKTUR & SISTEM TRANSPORT MEMBRAN -...
Transcript of STRUKTUR & SISTEM TRANSPORT MEMBRAN -...
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STRUKTUR & SISTEM TRANSPORT MEMBRAN
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PENDAHULUAN
Membran Plasma
Retikulum Endoplasma
Badan Golgi
Lisosom
Mitokondria
Sitoplasma
Membran
Nukleus
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STRUKTUR MEMBRAN
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TRANSPORT MATERI
PADA MEMBRAN
1. Mekanisme pasif
2. Mekanisme aktif
3. Endositosis dan Eksositosis
Difusi sederhana
Difusi difasilitasi
Transport aktif/ pump
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TRANSPORT MATERI
PADA MEMBRAN
1. Mekanisme passive
a. Diffusi sederhana
- Mengikuti gradient elektrokimia
- Diffusi sederhana dipengaruhi oleh :
agitasi thermal molekul spesifik,
gradient konsentrasi, dan kelarutan
materi tersebut.
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TRANSPORT MATERI
PADA MEMBRAN
b. Diffusi difasilitasi, memerlukan :
- Prot. Carrier (dapat jenuh v-max)
- Tempat ikatan spesifik pada solut
- Terutama terhadap beberapa ion, gula serta asam amino
- Konstanta pengikatan solut pada sistem
- Molekul serupa menjadi inhibitor kompetitif
Diffusi difasilitasi berlangsung dengan mekanisme pingpong
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Glucose transporter (GLUT)
GLUT 1: Brain, Kidney, Colon, Placenta and
Erythrocyte
GLUT 2: Liver, Pancreatic B cell, Small intestine,
Kidney
GLUT 3: Brain, Kidney, Placenta
GLUT 4: Heart, Skeletal muscle, adipose tissue (insulin-
sensitive)
GLUT 5: Small intestine
SGLT 1: Small intestine, Kidney ( Na-dependent )
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TRANSPORT MATERI
PADA MEMBRAN
2. Mekanisme aktif
- Transport aktif/ pump
- Menjauhi keseimbangan termodinamika,
melawan gradien elektrokimia
- Butuh energi (ATP) dan protein carrier
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Transport aktif primer : Na-K ATP-ase , dll
Transport aktif sekunder : symport Na-
glukosa , dll.
Sistem transport mengatur fungsional
jumlah dan arah pergerakan molekul :
- uniport
- Symport
- Antiport
TRANSPORT MATERI
PADA MEMBRAN
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TRANSPORT MATERI
PADA MEMBRAN
3. Endositosis dan Eksositosis
- Transport makromolekol (polisakarida,
protein, polinukleotida, dll)
- Menggunakan pembentukan vesikel dari
atau dengan membran plasma
- Endositosis untuk internalisasi
- Eksositosis untuk eksternalisasi
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ENDOSITOSIS
PINOSITOSIS : pada semua sel
1. Fase cairan : non selektif, proporsional dengan
konsentrasi.
2. Fase absorptif : selektif, terbatas pada reseptor tertentu, vesikel terbungkus klatrin
Proses : invaginasi vesikel fusi
kemembran organella transfer isi.
Butuh energi, ca++, dan sistem mikrofilament
Ada dua type : fagositosis dan pinositosis
FAGOSITOSIS : untuk sel-sel makrofag
dan neutrofil.
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Phagocytosis
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EKSOSITOSIS
Molekul yang dilepas digolongkan dalam:
1. Molekul yang terikat pada permukaan sel
2. Molekul yang menjadi bagian dari matriks
ekstra sel.
3. Molekul yang diekstra sel menjadi sinyal
bagi sel lain.
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Exocytosis Transport
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