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- W2018364944 abstract "Egg yolk is used in extender to protect sperm from cold shock and freezing during preservation. It is the low-density lipoprotein (LDL) fraction of egg yolk that protects sperm. Even though essential for sperm capacitation, the major proteins from bull seminal plasma, the Binder of SPerm (BSP) proteins, are detrimental for sperm preservation because they induce a continual phospholipids and cholesterol efflux from sperm membranes. The BSP proteins were proposed to bind to egg yolk LDL, preventing the sperm membrane damage. We characterized the binding between the BSP proteins and the LDL by isothermal titration calorimetry, providing the thermodynamics and quantitative description of this putative association. The association between BSP1 (major BSP proteins) and LDL is characterized by an affinity constant (Ka) of 3.4 ± 0.4 μM−1. A protein/LDL ratio of 104 ± 5 was determined indicating that 104 molecules of BSP1 would bind to one LDL particle. This stoichiometry leads to proposing that the association involves 1.6 ± 0.1 phosphatidylcholines (PC) per BSP protein. This finding is satisfactorily consistent with the fact that each BSP1 protein has 2 binding sites for choline group. In conclusion, the formation of a high affinity complex between BSP1 and LDL is proposed to be important for the protection of sperm by egg yolk extender." @default.
- W2018364944 created "2016-06-24" @default.
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- W2018364944 date "2011-03-01" @default.
- W2018364944 modified "2023-10-17" @default.
- W2018364944 title "Thermodynamics of the interaction between bovine binder of sperm BSP1 and low-density lipoprotein from hen's egg yolk" @default.
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- W2018364944 doi "https://doi.org/10.1016/j.tca.2011.01.003" @default.
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