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Lipoproteins
Medical School Biochemistry
31
Biochemistry
Graduate
10/24/2011

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Cards

Term
What is an alpha lipoprotein?
Definition
HDL
Term
What is a beta lipoprotein?
Definition
LDL
Term
What is a pre-beta lipoprotein?
Definition
VLDL
Term
What is a Dis beta band?
Definition
IDL/remnants, typically indicative of disease
Term
What is the relationship of HDL, LDL, and Coronary heart disease?
Definition
Increasing LDL and Decreasing HDL in combination are significant predictors of Cardiovasular risk
Term
What is type I Hyperlipoproteinemia?
Definition
Elevated Chylomicrons
Term
What is type IIa Hyperlipoproteinemia?
Definition
Elevated LDL
Term
What is type IIb Hyperlipoproteinemia?
Definition
elevated LDL and VLDL
Term
What is type III Hyperlipoproteinemia?
Definition
Elevated Beta-VLDL (IDL/remnants)
Term
What is type IV Hyperlipoproteinemia?
Definition
Elevated VLDL
Term
What is type V Hyperlipoproteinemia?
Definition
Elevated VLDL and Chylomicrons
Term
Where do ingested triglycerides go?
Definition
to adipose tissue and liver (then adipose again)
Term
How are Fatty Acids transported?
Definition
Albumin
Term
How are Triglycerides, phospholipids, and cholesterol transported?
Definition
on lipoproteins
Term
What are Apoproteins?
Definition
proteins associated with plasma liposomes
Term
What force keeps apoproteins attached to the lipoprotein membrane?
Definition
Hydrophobic forces, apoproteins have hydrophillic/hydrophobic ends
Term
What are the three major functions of Apoproteins?
Definition
1) Structural/exocytosis
2) Regulatory
3) Targeting
Term
Which apoproteins are reversibly associated with the lipoprotein particles?
Definition
Group 1 (A1, A2, A4, C1, C2, C3, and E)
Term
What are the apoproteins that do not move from their respective lipoprotein?
Definition
Group 2:

B-100: VLDL/LDL

B-48: Chylomicrons
Term
What is the function of LCAT/ACAT?
Definition
Cholesterol synthesis
Term
What is the function of MTP?
Definition
Resynthesis of lipolytic products into triglycerides in the intenstine.
Term
What happens when MTP is malfunctioning?
Definition
Disease state known as abetalipoproteinemia. Characterized by no LDL
Term
When the chylomicron enters the lymph, which Apoproteins will be attached?
Definition
B48, A1, A2, A4
Term
What is the function of B48?
Definition
allows secretion of chylomicron from intestine
Term
What does A1 do?
Definition
Activates LCAT
Term
What does A2 do?
Definition
Activate Hepatic lipase
Term
What does C1 do?
Definition
Activates LCAT
Term
What does C2 do?
Definition
Activate Lipoprotein Lipase
Term
What does C3 do?
Definition
prevents removal of triglyceride rich particles
Term
What does E do?
Definition
High affinity ligand for LDL receptor
Term
What is the function of heparin sulfate?
Definition
Cell receptor that attracts LPL (lipoprotein lipase).

C2 will bind to LPL and allow for triglyceride degradation
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