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Howard Temin
1964
Rous Sarcoma Virus (RSV)
RSV effect on cells in vitro: transformed (formed foci-tumor)
Rous Sarcoma Virus
RSV
in vitro
cells in a lab environment (outside of body)
transformation
acquisition of cancer properties
properties of transformed cells
altered morphology
less need for growth factor
increased glucose use
loss of contact inhibition
anchorage independence
immortalization
altered morphology
properties of transformed cells: ___
looked different than normal cells
less need for growth factor
properties of transformed cells: ___
cells would still divide anyway
increased glucose use
properties of transformed cells: ___
cells abnormally active (dividing a lot), use more ___
causes fast weight loss, tell of cancer
loss of contact inhibition
properties of transformed cells: ___
divides even if there is no room for new cells
anchorage independence
properties of transformed cells: ___
can divide without being firmly attached to a solid substrate
immortalization
properties of transformed cells: ___
cancer cells undergo indefinite proliferation in cell culture
healthy cells
become confluent in vitro
grow to touch but not on top of each other
monolayer
contact inhibition: tells cell that if it divides and its all close together, no room for new cell
cell inhibition
tells cell that if it divides and its all close together, no room for new cell
cells infected with RSV
loss of contact inhibition (surrounded on all sides)
large clumps form on top of one another
how does RSV do this?
integration
viral DNA is inserted into the cells’ DNA
when the host cell replicates, the viral DNA is also replicated as part of its genome
how would viral genome insertion turn to cancer?
change start codon of some gene → non-functional gene
viral gene inserted for a RTK or telomerase → keeps cell from dying
makes changes to TFs
oncogene
a gene that has the potential to cause cancer when not properly regulated
oncogene amplification (viral)
add additional copies of genes
increases transcription
myc example (cell cycle regulator)
inserted by RSV
number of copies of myc determines survival
under 10 copies → 95% chance at living to 7 years
over 10 copies → close to 0% chance at living to 7 years
myc example (cell cycle regulator)
inserted by RSV
number of copies of myc determines survival
under 10 copies → 95% chance at living to 7 years
over 10 copies → close to 0% chance at living to 7 years
number of copies of myc
myc example (cell cycle regulator)
inserted by RSV
___ determines survival
under 10 copies → 95% chance at living to 7 years
over 10 copies → close to 0% chance at living to 7 years
HER 2
found in many breast cancers
average more than 5 copies
HER 2 not amplified: 50% survival for 7 years
HER 2 amplified: very low survival for 7 years
10
myc example (cell cycle regulator)
inserted by RSV
number of copies of myc determines survival
under ___ copies → 95% chance at living to 7 years
over ___ copies → close to 0% chance at living to 7 years
5
HER 2
found in many breast cancers
average more than ___ copies
HER 2 not amplified: 50% survival for 7 years
HER 2 amplified: very low survival for 7 years
endomembrane system
initial increase in surface area to increase nutrient absorption
same
cell has many of the same organelles
1700 mitochondria
400 peroxisomes
300 lysosomes
200 endosomes
zip coding
destination info
receptor: cell surface
TF: cytosol until needed in nucleus
experiment
testing if there are specific amino acids that deal with destination
removed ER signal sequence from ER protein and attached to cytosolic protein → found out about signal sequencing
signal sequences
amino acid sequences that act as zipcoding
protein sorting
mitochondria, nucleus, chloroplasts
directly from cytosol
golgi, lysosomes, plasma membrane
indirect from ER
directly from cytosol
protein sorting
mitochondria, nucleus, chloroplasts
___
golgi, lysosomes, plasma membrane
indirect from ER
indirect from ER
protein sorting
mitochondria, nucleus, chloroplasts
directly from cytosol
golgi, lysosomes, plasma membrane
___
protein sorting
transport through nuclear pores
transport across membranes
transport by vesicles
all depend on signal sequence
ER and golgi
why do some proteins go through the ___ and ___?
modification of the protein
checking the integrity/functionality of the protein
put into vesicles to properly insert into membranes
nuclear transport
nuclear pores (holes in swiss cheese)
selective gates for macromolecules - active transport
choosing what goes in and out
using energy
free diffusion for small molecules
nuclear pore complex (NPC)
about 2000 ___ act as tunnel into and out of nucleus
require NES or NLS to go through
nuclear export signal
NES
nuclear localization signal
NLS
entering/exiting the nucleus
NLS
sequence of amino acids allowing for entrance to nucleus
TF/histones/polymerase do this
NES
sequence of amino acids allowing for exit from nucleus
mRNA doesn’t directly contain either!!
NLS
sequence of amino acids allowing for entrance to nucleus
TF/histones/polymerase do this
NES
sequence of amino acids allowing for exit from nucleus
nuclear pore complex (NPC)
each pore is composed of nucleoporins
about 450 individual nucleoporins (proteins) make entire ___
nucleoporins
nuclear pore complex
each pore is composed of ___
about 450 individual ___ (proteins) make entire NPC
energy
___ from one process (NES or NLS) can drive movement of the other
conformational change
exportin can also be an importin
different binding sites
___
exportin
recognize NES and help bring it through the NPC
importin
recognizes NLS
NPC
karyopherins
nuclear transporters
carry cargo proteins that contain a NLS or NES through ___
karyopherins
___
nuclear transporters
carry cargo proteins that contain a NLS or NES through NPC
karyopherins
importins
proteins involved in transporting into the nucleus
recognize the NLS
exportins
proteins involved in transporting out of the nucleus
these recognize the NES
sometimes a single ___ can act as both
Ras-related nuclear protein
Ran
Ran
export is dependent on ___-GTP and ___-GDP
not a karyopherin
exportin
when associated with Ran-GTP
bound tightly to cargo
when it reaches the cytosol
Ran-GTP converted to Ran-GDP
remove phosphate group
export
___is dependent on Ran-GTP and Ran-GDP
not a karyopherin
NES
amino acid sequence: how get out
mRNA must recruit proteins that contain ___
TREX complex
mRNA to be exported will usually be associated with the following protein complex
contains many individual factors
complex forms on mRNA
requires 5’ cap and pol A tail
contains NES
mRNA
TREX complex
___ to be exported will usually be associated with the following protein complex
contains many individual factors
complex forms on ___
requires 5’ cap and pol A tail
contains NES
requires 5’ cap and pol A tail
TREX complex
mRNA to be exported will usually be associated with the following protein complex
contains many individual factors
complex forms on mRNA
___
contains NES
5’ cap and poly A tail
___ and ___ important for protection and movement out of nucleus
GTP-GDP
causes conformational change that leads to decrease in affinity for one another
methylated guanine
5’ cap is ___
exportins
TREX complex contains the NES and recruits TAP (exportins)
TAP
recruited by TREX when fully assembled
TAP cannot bind to mRNA without TREX
TREX
exportins
___ complex contains the NES and recruits TAP (exportins)
TAP
recruited by ___when fully assembled
TAP cannot bind to mRNA without ___
TAP
exportins
TREX complex contains the NES and recruits ___ (exportins)
___
recruited by TREX when fully assembled
___ cannot bind to mRNA without TREX
TAP
recruited by TREX when fully assembled
cannot bind to mRNA without TREX
exportins
Ran-GAP
remove 1 phosphate group from Ran-GTP
Ran-GTP
Ran-GAP: remove 1 phosphate group from ___
Ran-GEF
converts Ran-GDP → Ran-GTP
Ran
hydrolyzes its bound GTP
dissociates from exportin
Ran-GTP
to get out of nucleus
Ran-GDP
to get into nucleus
mitochondria
has inner and outer membrane
double membrane from when it absorbed that thing long ago
transport
___ into mitochondria and chloroplasts
specific signal sequences
must unravel to enter (completely denatures)
signal removed upon entry-cleaved off protein
requires translocator on inner and outer membrane
mitochondria and chloroplasts
transport into ___ and ___
specific signal sequences
must unravel to enter (completely denatures)
signal removed upon entry-cleaved off protein
requires translocator on inner and outer membrane
ER
water soluble proteins
amino acid signal recognition particle and SRP receptor
into ___ lumens (with translocator)
enzyme: signal peptidase
cut off the ___ signal sequence
inside ___: fold it with chaperone proteins
transmembrane proteins: single pass
hydrophobic stop-transfer sequence
hydrophobic start-transfer sequence
translocator starts process but stops the transfer at stop sequence
post translational modifications in the ER
disulfide bond formation
cysteine-cysteine covalent bond
stabilize protein structure
glycosylation
covalent attachment of carbohydrate
protein protection
organelle trafficking signal
immune cell recognition
disulfide bond formation
cysteine-cysteine covalent bond
stabilize protein structure
glycosylation
covalent attachment of carbohydrate
protein protection
organelle trafficking signal
immune cell recognition
ER
not all proteins make it out of the ___
unfolded (misfolded) protein response
receptors
ER contains ___ for misfolded proteins
IRE 1
ATF 6
PERK
when activated, they begin the UPR (unfolded protein response)
activated by misfolded proteins
IRE 1
ATF 6
PERK
ER contains receptors for misfolded proteins
what are the three?
when activated, they begin the UPR (unfolded protein response)
activated by misfolded proteins
UPR (unfolded protein response)
ER contains receptors for misfolded proteins
IRE 1
ATF 6
PERK
when activated, they begin the ___
activated by misfolded proteins
unfolded protein response
UPR
proteins entering the ER
water soluble proteins
enter directly into the lumen of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
transmembrane proteins
get embedded into the ER membrane
destined for plasma membrane, or organelle membrane
water soluble proteins
proteins entering the ER
___
enter directly into the lumen of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
transmembrane proteins
get embedded into the ER membrane
destined for plasma membrane, or organelle membrane
lumen
proteins entering the ER
water soluble proteins
enter directly into the ___of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
transmembrane proteins
get embedded into the ER membrane
destined for plasma membrane, or organelle membrane
ER
ER/golgi/peroxisome
proteins entering the ER
water soluble proteins
enter directly into the lumen of ___
destined to be released from the cell or to be in the lumen of ___
transmembrane proteins
get embedded into the ER membrane
destined for plasma membrane, or organelle membrane
transmembrane proteins
proteins entering the ER
water soluble proteins
enter directly into the lumen of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
___
get embedded into the ER membrane
destined for plasma membrane, or organelle membrane
embedded
proteins entering the ER
water soluble proteins
enter directly into the lumen of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
transmembrane proteins
get ___into the ER membrane
destined for plasma membrane, or organelle membrane
ER membrane
proteins entering the ER
water soluble proteins
enter directly into the lumen of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
transmembrane proteins
get embedded into the ___
destined for plasma membrane, or organelle membrane
plasma membrane, or organelle membrane
proteins entering the ER
water soluble proteins
enter directly into the lumen of ER
destined to be released from the cell or to be in the lumen of ER/golgi/peroxisome
transmembrane proteins
get embedded into the ER membrane
destined for ___
UPR functions
halt new protein production
more chaperone proteins recruited to help with misfolded protein
destroy the un/misfolded proteins in ER
if 1-3 don’t work, cell does apoptosis
different location
the ER is often stop #1 to a ___
transport and vesicles carry proteins between compartments
vesicular transport
vesicle budding is driven by the assembly of a protein coat
vesicle budding
vesicular transport
___ is driven by the assembly of a protein coat
protein coat
vesicular transport
vesicular budding is driven by the assembly of a ___
one type of vesicle
type of coated vesicle: clathrin-coated
coat proteins: clathrin and adaptin 2
origin: plasma membrane
destination: endosomes
vesicle recycling/retrieval
clathrin-coated
one type of vesicle
type of coated vesicle: ___
coat proteins: clathrin and adaptin 2
origin: plasma membrane
destination: endosomes
vesicle recycling/retrieval
clathrin and adaptin 2
one type of vesicle
type of coated vesicle: clathrin-coated
coat proteins: ___
origin: plasma membrane
destination: endosomes
vesicle recycling/retrieval
plasma membrane
one type of vesicle
type of coated vesicle: clathrin-coated
coat proteins: clathrin and adaptin 2
origin: ___
destination: endosomes
vesicle recycling/retrieval
endosomes
one type of vesicle
type of coated vesicle: clathrin-coated
coat proteins: clathrin and adaptin 2
origin: plasma membrane
destination: ___
vesicle recycling/retrieval