Secretory pathways I Flashcards Preview

M2M Unit III > Secretory pathways I > Flashcards

Flashcards in Secretory pathways I Deck (16)
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1
Q

Proteins move through _______ across a membrane from the cytosol into an organelle

A

translocators

2
Q

Peptide synthesis is initiated on

A

ribosomes in the cytoplasm

3
Q

A signal sequence is reached during synthesis that signals for the

A

translocation of the growing peptide into the ER

4
Q

_______ binds the translated signal sequence and free ribosome

A

A signal recognition particle

5
Q

SRP has a _______ rich binding binding pocket that allows it to be flexible in terms of what it binds

A

methionine

6
Q

SRP then binds _______ and halts _______

A
  • GTP

- elongation of the peptide

7
Q

The ribosome and peptide are brought to

A

SRP receptors on the cytosolic face of the ER

8
Q

The growing peptide is transferred to a

A

translocon complex

9
Q

SRP dissociates from the complex as _______ is hydrolyzed

A

GTP

10
Q

SRP dissociates from the complex as GTP is _______

A

hydrolyzed

11
Q

Elongation of the peptide continues, feeding the growing peptide into the

A

lumen of the ER

12
Q

After synthesis is complete, the signal sequence is cleaved by _______ and the _______ dissaciates and is recycled

A
  • signal peptidase

- ribosome

13
Q

Cargo proteins are released into

A

the lumen of the ER

14
Q

Transmembrane proteins differ in that they contain a transmembrane domain called the

A

stop transfer sequence

15
Q

Type 1 transmembrane proteins have their amino terminus

A

inside the lumen

16
Q

Type 2 transmembrane proteins have their amino terminus

A

outside the lumen