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Biosynthesis of Isoleucine and Valine in Rhodopseudomonas spheroides: Regulation of Threonine Deaminase Activity

^a Biochemistry Department, John Curtin School of Medical Research, The Institute of Advanced Studies, Australian National University, Canberra, A.C.T., Australia

ABSTRACT

The activities of threonine deaminase, acetohydroxy acid synthetase, acetohydroxy acid reductoisomerase, dihydroxy acid dehydrase, and transaminase B were detected in cell-free extracts of Rhodopseudomonas spheroides. No significant repression or derepression of threonine deaminase activity was observed.

¹ Present address: Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106.