title: DNA-interacting proteins in the spermiogenesis of the mollusc Murex brandaris.
abstract: Sperm chromatin of Murex brandaris (a neogastropod mollusc) undergoes a series of structural transitions during spermiogenesis. The DNA-interacting proteins responsible for these changes as well as the mature protamines present in the ripe sperm nucleus have been characterized. The results reveal that spermiogenic nuclear proteins are protamine precursors that are subjected to a substantial number of small N-terminal deletions that gradually modify their overall charge. The composition of mature protamines is remarkably simple in turn, promoting an efficient and extremely tight packaging of DNA. The pattern of spermiogenic chromatin condensation in M. brandaris clearly departs from that corresponding to vertebrate chromatin.
authors.affiliation: Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Cáceres
authors.forename: P
authors.initials: P
authors.lastname: Giménez-Bonafé
authors.forename: E
authors.initials: E
authors.lastname: Ribes
authors.forename: D
authors.initials: D
authors.lastname: Wouters-Tyrou
authors.forename: A
authors.initials: A
authors.lastname: Martinage
authors.forename: M
authors.initials: M
authors.lastname: Kouach
authors.forename: P
authors.initials: P
authors.lastname: Sautière
authors.forename: S
authors.initials: S
authors.lastname: Muller
authors.forename: J
authors.initials: J
authors.lastname: Palau
authors.forename: J A
authors.initials: JA
authors.lastname: Subirana
authors.forename: L
authors.initials: L
authors.lastname: Cornudella
authors.forename: M
authors.initials: M
authors.lastname: Chiva
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004268:DNA-Binding Proteins / Q000502:physiology*; D008297:Male; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D008974:Mollusca / Q000502:physiology*; D010766:Phosphorylation; D011479:Protamines / Q000737:chemistry / Q000378:metabolism*; D011498:Protein Precursors / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013091:Spermatogenesis / Q000502:physiology*; D014961:X-Ray Diffraction
chemical_list: D004268:DNA-Binding Proteins; D011479:Protamines; D011498:Protein Precursors; C046533:protamine P1