SUBUNITS OF THE EXTRACELLULAR HEMOGLOBIN OF TUBIFEX-TUBIFEX

被引:21
作者
VINOGRADOV, SN
HERSEY, SL
FROHMAN, C
KAPP, OH
机构
[1] Biochemistry Department, Wayne State University School of Medicine, Detroit
关键词
(Annelid); Equilibrium sedimentations; Hemoglobin; Molecular weight;
D O I
10.1016/0005-2795(79)90129-6
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The molecular weight of the extracellular hemoglobin of Tubifex tubifex determined by equilibrium sedimentation is 3.0 ± 0.2 · 106. Polyacrylamide gel electrophoresis in sodium dodecyl sulfate showed that the hemoglobin dissociated into four subunits: 13 000 (subunit 1), 21 000 (subunit 2), 23 000 (subunit 3) and 47 000 (subunit 4); in the presence of mercaptoethanol two subunits were observed, 13 000 ± 1000 (subunit I) accounting for 70-80% of the whole molecule, and 26 000 (subunit II). Electrophoresis of the subunits obtained in the absence of mercaptoethanol showed that subunit I originated from subunits 1 and 4, while subunit II originated from subunits 2 and 3. These relationships were supported by N-terminal group determinations. Gel filtration in 6 M guanidine hydrochloride showed that the molecular weight of subunit I is 17 500 and that of subunit II, 36 000. Tubifex hemoglobin appears to consist of at least seven polypeptide chains. © 1979.
引用
收藏
页码:216 / 222
页数:7
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