NDLI: Formation of the four isomers of hen egg white lysozyme containing three negative disulfide bonds and one open disulfide bond.

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Formation of the four isomers of hen egg white lysozyme containing three negative disulfide bonds and one open disulfide bond.

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Formation of the four isomers of hen egg white lysozyme containing three negative disulfide bonds and one open disulfide bond.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Taniuchi, H. Acharya, A. S.
Abstract	Reduced partially carboxymethylated hen egg white lysozyme (mucopeptide N-acetylmuramoylhydrolase; EC 3.2.1.17) (approximately 0.8 mol of [1-(14)C]carboxymethyl groups) was air oxidized at pH 8.0 and 37 degrees in the presence of 1.5 mM 2-mercaptoethanol for 36 hr. Gel filtration of this product gave the lower (native) and higher hydrodynamic volume forms, both containing radioactivity (approximately 35 and 65%, respectively). Ion exchange chromatography of the lower hydrodynamic volume forms yielded renatured lysozyme, two major radioactive samples (LH(C) and LH(D)) eluting at the positions of monocarboxymethylated lysozyme, and two minor radioactive samples eluting at the positions of dicarboxymethylated lysozyme. Sample LH(C) (approximately 23% of the radioactivity) was essentially homogeneous with respect to electrophoretic mobility, exhibited approximately 39% of the enzymic activity of lysozyme, and contained 0.95 mol of [(14)C]carboxymethyl groups. Sample LH(D) (approximately 8% of the radioactivity) was also enzymically active and contained approximately 0.5 mol of [(14)C]carboxymethyl groups; this low value is apparently due to contamination of noncarboxymethylated species. The radioactive tryptic peptides from samples LH(C) and LH(D) were characterized. The results indicated that all eight isomers, containing three presumably native disulfide bonds and one free and one carboxymethylated sulfhydryl group, are formed on air oxidation of reduced partially carboxymethylated lysozyme. Since in each of these isomers the formation of one of the four native disulfide bonds is permanently blocked, it would follow that no one of the four disulfide bonds of native lysozyme is obligatory in the formation of the other three native disulfide bonds.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	6
Volume Number	74
Language	English
Publisher	National Academy of Sciences
Publisher Date	1977-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Isoenzymes Muramidase Amino Acid Sequence Animals Binding Sites Cysteine Disulfides Egg White Protein Binding Protein Conformation Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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