Mutational analysis of the hormone-sensitive lipase translocation reaction in adipocytes

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Mutational analysis of the hormone-sensitive lipase translocation reaction in adipocytes. / Su, CL; Sztalryd, C; Contreras, Juan Antonio; Holm, Cecilia; Kimmel, AR; Londos, C.

In: Journal of Biological Chemistry, Vol. 278, No. 44, 2003, p. 43615-43619.

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Su, CL ; Sztalryd, C ; Contreras, Juan Antonio ; Holm, Cecilia ; Kimmel, AR ; Londos, C. / Mutational analysis of the hormone-sensitive lipase translocation reaction in adipocytes. In: Journal of Biological Chemistry. 2003 ; Vol. 278, No. 44. pp. 43615-43619.

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TY - JOUR

T1 - Mutational analysis of the hormone-sensitive lipase translocation reaction in adipocytes

AU - Su, CL

AU - Sztalryd, C

AU - Contreras, Juan Antonio

AU - Holm, Cecilia

AU - Kimmel, AR

AU - Londos, C

PY - 2003

Y1 - 2003

N2 - Lipolysis in adipocytes governs the release of fatty acids for the supply of energy to various tissues of the body. This reaction is mediated by hormone-sensitive lipase (HSL), a cytosolic enzyme, and perilipin, which coats the lipid droplet surface in adipocytes. Both HSL and perilipin are substrates for polyphosphorylation by protein kinase A (PKA), and phosphorylation of perilipin is required to induce HSL to translocate from the cytosol to the surface of the lipid droplet, a critical step in the lipolytic reaction (Sztalryd C., Xu, G., Dorward, H., Tansey, J.T., Contreras, J.A, Kimmel, A. R., and Londos, C. (2003) J. Cell Biol. 161, 1093-1103). In the present paper we demonstrate that phosphorylation at one of the two more recently discovered PKA sites within HSL, serines 659 and 660, is also required to effect the translocation reaction. Translocation does not occur when these serines residues are mutated simultaneously to alanines. Also, mutation of the catalytic Ser-423 eliminates HSL translocation, showing that the inactive enzyme does not migrate to the lipid droplet upon PKA activation. Thus, HSL translocation requires the phosphorylation of both HSL and perilipin.

AB - Lipolysis in adipocytes governs the release of fatty acids for the supply of energy to various tissues of the body. This reaction is mediated by hormone-sensitive lipase (HSL), a cytosolic enzyme, and perilipin, which coats the lipid droplet surface in adipocytes. Both HSL and perilipin are substrates for polyphosphorylation by protein kinase A (PKA), and phosphorylation of perilipin is required to induce HSL to translocate from the cytosol to the surface of the lipid droplet, a critical step in the lipolytic reaction (Sztalryd C., Xu, G., Dorward, H., Tansey, J.T., Contreras, J.A, Kimmel, A. R., and Londos, C. (2003) J. Cell Biol. 161, 1093-1103). In the present paper we demonstrate that phosphorylation at one of the two more recently discovered PKA sites within HSL, serines 659 and 660, is also required to effect the translocation reaction. Translocation does not occur when these serines residues are mutated simultaneously to alanines. Also, mutation of the catalytic Ser-423 eliminates HSL translocation, showing that the inactive enzyme does not migrate to the lipid droplet upon PKA activation. Thus, HSL translocation requires the phosphorylation of both HSL and perilipin.

U2 - 10.1074/jbc.M301809200

DO - 10.1074/jbc.M301809200

M3 - Article

VL - 278

SP - 43615

EP - 43619

JO - Journal of Biological Chemistry

JF - Journal of Biological Chemistry

SN - 1083-351X

IS - 44

ER -