Biochem Flashcards
type I collagen
most common (90%) Bone Skin Tendon dentin fascia cornea late wound repair
defective in osteogenesis imperfecta
type I = bONE
type II collagen
Cartilage (including hyaline)
vitreous body
nuclear pulposus
type II = carTWOlage
type III collagen
Reticulin - skin, blood vessels, uterus, fetal tissue, granulation tissue
type III = defective in Ehlers-Danlos (threE D)
type IV collagen
basement membrane
basal lamina
type IV = under the FLOOR (BM)
defective in Alport synd
ApoA-I
LCAT activation (cholesterol esterification) only in HDL
ApoB-48
chylomicron assembly and secretion by intestine to lymphatics
found in chylomicrons + remnants of chylomicrons
ApoB-100
LDL particle uptake by extrahepatic cells (BINDS LDL receptor)
found on VLDL, IDL, LDL
ApoC-II
LPL activation (cofactor for) found on chylomicrons, VLDL, HDL
ApoE3 & E4
VLDL and chylomicron remnant uptake by liver cells
found on all, EXCEPT LDL!
vimentin
CT;
sarcomas
desmin
muscle;
rhabdomyosarcoma, leiomyosarcoma
cytokeratin
epithelial cells;
carcinomas
GFAP
neuroglia (astrocytes, schwann cells, etc.);
astrocytomas, glioblastomas
neurofilaments
axons w/in neurons;
neuroblastomas, primitive neuroectodermal tumors
peripherin
neurons
nuclear lamins (A,B,C)
nuclear envelope structural framework and DNA within
elastin contains which AA?
proline + glycine
enzymes that use B1 (thiamine) as cofactor
pyruvate dehydrogenase
alpha-ketoglutarate dehydrogenase
transketolase
rate limiting step in purine synth
glutamine PRPP amidotransferase
rate-limiting step in pyrimidine synth
CPS-II
needed to make pyrimidines
carbomyl phosphate (from ATP, CO2, glutamine) aspartate
needed to make purines
glycine aspartate glutamine THF CO2
causes the positive charge of histones
lysine
arginine
causes the negative charge of DNA
phosphate groups