Abstract
The surface membrane protein of boar sperm and the proteins in the fluid surrounding the gametes were analyzed during epididymal transit. The present study demonstrated that sequential dramatic changes occur in protein composition of the sperm membrane and epididymal fluid during epididymal transit. The maturation process of the boar sperm surface was characterized by a complex sequential evolution of the composition and orientation of macromolecules in the sperm membrane. Epididymal maturation resulted in the progressive disappearance of most of the surface testicular compounds, which were either renewed or masked by new permanent or transient low molecular weight polypeptides on the boar sperm surface membrane. In the fluid surrounding the spermatozoa, composition of the luminal proteins was altered throughout the epididymal transit and several new compounds were characterized. Very few proteins were correlated either with blood plasma or sperm surface compounds.
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