Human spleen histone H2B. Isolation and amino acid sequence.

Abstract:

:The amino acid sequences of human histones have been investigated for studies of histone evolution. The whole histone was prepared from human spleen and was separated into 3 fractions, H4+H3+H2A, H2B, and H1, by our technique of CM-cellulose chromatography. The H2B fraction was further purified by Bio-Gel P-60 chromatography. For sequence determination, the H2B molecule was first split into 4 major fragments I to IV, by limited chymotryptic digestion at pH 5.0 and 15 degrees C, followed by Sephadex G-50 chromatography. Fragments I and III were then digested with trypsin, yielding 18 and 16 peptides, respectively, on column and paper chromatographies. Sequence analyses of these tryptic peptides, as well as chymotryptic fragments II and IV, showed no differences from the corresponding parts of calf thymus H2B sequence, making it possible to locate fragments I to IV at residues 1--40, 41--42, 43--121 and 122--125 of the total sequence. The only new findings were microheterogeneities at residues 39 (75% valine and 25% isoleucine) and 124 (70% serine and 30% alanine). The sequence of the most basic cluster at residues 27--24, -Lys-Lys-Arg-Lys-Arg-Ser-Arg-Lys-, was confirmed with a peptide obtained from fragment I by staphylococcal protease digestion. Thus, it is concluded that the H2B sequence of lower mammals was conserved during the evolutionary process leading to man.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Ohe Y,Hayashi H,Iwai K

doi

10.1093/oxfordjournals.jbchem.a132371

subject

Has Abstract

pub_date

1979-02-01 00:00:00

pages

615-24

issue

2

eissn

0021-924X

issn

1756-2651

journal_volume

85

pub_type

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