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Biology of Reproduction, Vol 22, 319-332, Copyright © 1980 by Society for the Study of Reproduction
1 Department of Anatomy,
Vanderbilt University,
Nashville, Tennessee 37232 Rat sperm outer dense fibers (ODF) have been studied by several electron microscopic techniques to determine fine structural features of the ODF cortex and medulla. Cross sections of
Triton X-100 demembranated flagella, fixed in the presence of ruthenium red, reveal a well defined
ODF cortex which appears to be composed of a single lamina of 6-7 nm diameter globular particles, whereas the medulla appears electron dense with no obvious substructure. Surface replicas and
positively or negatively stained whole mount preparations reveal a crossbanding pattern with a 40
nm major period repeat that extends obliquely over the outer dense fiber surface. These periodicities appear to be confined to the outer dense fiber cortex. Sequential solubilization of spermatozoan organelles in sodium dodecyl sulfate or sodium
lauroyl sacrosine results in the isolation of a flagellar subfraction containing only the ODF and
attached connecting piece. Further solubilization of the complex in the ionic detergents results in
an ODF subfraction which contains 4 polypeptide components. The 3 low molecular weight
polypeptide bands have a high cysteine content (10-12%) while the high molecular weight component (87,000 daltons) contains
2 Department of Medicine,
Division of Human Genetics,
The New York Hospital-Cornell Medical Center,
New York, New York 10021
3% cysteine. Brief trypsin or chymotrypsin digestion of demembranated flagella gives an ODF subfraction which by SDS polyacrylamide gel electrophoresis
is shown to possess only the 3 low molecular weight polypeptide bands. These ODFs appear to
possess an intact medulla but are lacking a cortex, thereby suggesting that the low molecular
weight components are located in the medulla.
Accepted on October 31, 1979
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