Biochemical-Pathway Diversity in Archaebacteria
Abstract
Extreme halophiles such as Halobacterium vallismortis possess a prehenate dehydratase enzyme which is subject to allosteric activation by hydrophobic amino acids. This example of cross-pathway regulation (termed metabolic interlock) is characteristic of much or all of the Gram-positive lineage of eubacteria. We have extended the enzymological base of information to include organisms within the one of the three methanogen orders that is phylogenetically nearest to the Halobacteriales. Within the methanogen order, Methanomicrobiales, Methanohalophilus mahii (a member of the family Methanosarcinaceae) has been selected for in-depth study. The character states of aromatic amino acid biosynthesis have proven to be generally similar: in comparison of the extreme halophiles and the methanogen order studied here, differences were relatively minor, i.e., being of a quantitative nature rather than of a qualitative nature. (JS)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 30, 1990
- Accession Number
- ADA226200
Entities
People
- Roy A. Jensen
Organizations
- University of Florida