Secretion Flashcards
Examples of protein secretion
microbes - fungal sex pheromones
plants - gibberellins
mammals - growth hormone
Why secrete proteins
- construction of cell wall
- enzyme mediated extracellular degradation
- cell communication
How do growth hormones work
GH acts on tissues to promote growth
- they stimulates cells to take up amino acids
Gigantism
over production of GH
Pituitary dwarfism
underproduction of GH
- GH produced by genetically engineered bacteria
What does the plant embryo secrete
gibberellins - plant hormone
What do gibberellins trigger
changes in the aleurone layer inside the seed coat
= causes it to synthesise and secrete enzymes
What are plant gibberellins
secreted by plant embryos
- not proteins but are secreted
what is gibberellin A1 control
controls plant stem elongation
What are fungal sex pheromones
promote mating
examples of fungal sex pheromone
yeast alpha factor
what are intracellular compartments (targeting)
nucleus, mitochondrion, lysosome, chloroplast
What are the extracellular compartment (secretion)
Periplasm, cell wall, bloodstream
The secretory pathway
ER - Golgi apparatus - vesicles - secretion or lysosomes
