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CHOLESTRUCTURE

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REGULATION OF CHOLESTEROL HOMEOSTASIS BY THE ARH MEDIATED ENDOCYTOSIS OF THE LDL...

REGULATION OF CHOLESTEROL HOMEOSTASIS BY THE ARH MEDIATED ENDOCYTOSIS OF THE LDL RECEPTOR "Hypercholesterolemia, high levels of plasma LDL-cholesterol, is a major risk factor for atherosclerosis and premature coronary heart disease (CHD), a leading cause of death in worldwide. The clearance of LDL from the circulation... ver más

31/05/2015

TECHNION ISRAEL I...

227K€

Presupuesto del proyecto: 227K€

Líder del proyecto

TECHNION ISRAEL INSTITUTE OF TECHNOLOGY No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2015-05-31 No tenemos la información de la convocatoria

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TECHNION ISRAEL INSTITUTE O...

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Líder del proyecto

TECHNION ISRAEL INSTITUTE OF TECHNOLOGY No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 227K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto "Hypercholesterolemia, high levels of plasma LDL-cholesterol, is a major risk factor for atherosclerosis and premature coronary heart disease (CHD), a leading cause of death in worldwide. The clearance of LDL from the circulation occurs via endocytosis with the LDL-receptor (LDLR) mainly by liver cells. This hepatic recruitment of the LDL-LDLR complex to the clathrin-coated pits is dependent on the endocytic adaptor protein, autosomal recessive hypercholesterolemia (ARH), which recognizes the NPxY internalization signal on the LDLR cytoplasmic tail. Consequently, naturally occurring mutations in either LDLR or in ARH lead to sever hypercholesterolemia and premature onset of CHD. Therefore, studying the molecular interactions ARH forms at the cell surface to facilitate endocytosis of the LDLR is central to our understanding of cholesterol homeostasis. I recently solved a novel crystal structure of the LDLR-ARH interface at atomic resolution. Surprisingly, the structure reveals that the phosphotyrosine-binding (PTB) domain of ARH recognizes a longer portion of the LDLR tail than previously believed, and that ARH has discrete structural determinants for somewhat promiscuous binding of NPxY containing signals of various flanking specificities. To gain a detailed mechanistic understanding for the unique endoctytic function of ARH, this proposal will investigate (1) The molecular basis for receptor recognition by solving crystal structures of ARH with all the receptor tails it is known to bind; (2) The interaction of ARH with phosphoinositides and with cell membrane via tools from cell biology and biochemistry; (3) The interaction of ARH with clathrin and its major endocytic adaptor AP-2 structurally and biochemically. This multidisciplinary approach will significantly extend the molecular knowledge on sorting of LDLR to clathrin-coated pits which is highly significant for cellular physiology and for homeostasis of plasma cholesterol and cardiovascular health."

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