doi: 10.1111/j.1432-1033.1977.tb11563.x.
Subunit structure of the methionine-repressible aspartokinase II--homoserine dehydrogenase II from Escherichia coli K12
- PMID: 328280
- DOI: 10.1111/j.1432-1033.1977.tb11563.x
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Subunit structure of the methionine-repressible aspartokinase II--homoserine dehydrogenase II from Escherichia coli K12
Eur J Biochem.
.
Free article
Abstract
The quaternary structure of Escherichia coli K12 aspartokinase II--homoserine dehydrogenase II has been examined. This multifunctional protein has a molecular weight Mr = 176000. It is composed of two subunits having the same molecular weight and the same charge. The results obtained from the examination of tryptic maps, the number and amino acid composition of cysteine-containing peptides and the uniqueness of the N-terminal sequence, strongly suggest that the 2 subunits are identical. The properties of aspartokinase II--homoserine dehydrogenase II can be compared to those of the much better known protein aspartokinase I--homoserine dehydrogenase I.
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