TAILIEUCHUNG - Báo cáo khoa học: A unique vertebrate histone H1-related protamine-like protein results in an unusual sperm chromatin organization

Protamine-like proteins constitute a group of sperm nuclear basic proteins that have been shown to be related to somatic linker histones (histone H1 family). Like protamines, they usually replace the chromatin somatic his-tone complement during spermiogenesis; hence their name. Several of these proteins have been characterized to date in invertebrate organisms, but information about their occurrence and characterization in vertebrates is still lacking. | ễFEBS Journal A unique vertebrate histone Hi-related protamine-like protein results in an unusual sperm chromatin organization Nuria Saperas1 Manel Chiva2 M. Teresa Casas1 J. Lourdes Campos1 Jose M. Eirin-Lopez3 4 Lindsay J. Frehlick4 Celia Prieto1 Juan A. Subirana1 and Juan Ausio4 1 Departament d Enginyeria Química ETSEIB Universitat Politecnica de Catalunya Barcelona Spain 2 Departament de Ciencies Fisiologiques II Facultat de Medicina Universitat de Barcelona L Hospitalet de Llobregat Spain 3 Departamento de Biologia Celular y Molecular Universidade da Coruna Spain 4 Department of Biochemistry and Microbiology University of Victoria British Columbia Canada Keywords chromatin electron microscopy histone H1 protamine-like protein X-ray diffraction Correspondence J. Ausio Department of Biochemistry and Microbiology University of Victoria Petch Building Room 220 Victoria BC Canada V8W 3P6 Fax 1 250 721 8855 Tel 1 250 721 8863 E-mail jausio@ Received 13 July 2006 revised 10 August 2006 accepted 11 August 2006 doi Protamine-like proteins constitute a group of sperm nuclear basic proteins that have been shown to be related to somatic linker histones histone H1 family . Like protamines they usually replace the chromatin somatic histone complement during spermiogenesis hence their name. Several of these proteins have been characterized to date in invertebrate organisms but information about their occurrence and characterization in vertebrates is still lacking. In this sense the genus Mullus is unique as it is the only known vertebrate that has its sperm chromatin organized by virtually only protamine-like proteins. We show that the sperm chromatin of this organism is organized by two type I protamine-like proteins PL-I and we characterize the major protamine-like component of the fish Mullus surmuletus striped red mullet . The native chromatin structure resulting from the association of these proteins with DNA was studied by .

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