title: Determination of genome size of Haemophilus influenzae Sb: analysis of DNA restriction fragments.
abstract: Genomic DNA size was measured in clinical isolates of Haemophilus influenzae by Pulsed-Field Gel Electrophoresis of DNA restriction fragments. Because of the high (64%) A+T content of H. influenzae DNA, restriction enzymes that recognize sequences with at least four GC base pairs were expected to be rare cutters. Five enzymes that produced fragments greater than 200 kb in size were used to digest intact chromosomes and fragments resolved by TAFE and/or FIGE: ApaI (GGGCCC), EagI (CGGCCG), NotI (GCGGCCGC), RsrI (CGGA/TCCG), and SmaI (CCCGGG). All five had recognition sequences with at least six GC base pairs. The genomic DNA size of H. influenzae serotype b, estimated with ApaI, EagI, NotI, RsrII, and SmaI, is 1,950 kb.
authors.affiliation: Institute of Microbiology, University of Warsaw, Poland.
authors.forename: L
authors.initials: L
authors.lastname: Kauc
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D002648:Child; D002675:Child, Preschool; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000032:analysis*; D015252:Deoxyribonucleases, Type II Site-Specific; D016521:Electrophoresis, Gel, Pulsed-Field; D016680:Genome, Bacterial; D006193:Haemophilus influenzae / Q000145:classification / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D015252:Deoxyribonucleases, Type II Site-Specific