NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Apparent cooperativity of amino acid transport in Halobacterium halobium - Effect of electrical potentialActive serine accumulation in cell envelope vesicles from Halobacterium halobium proceeds by co-transport with Na(+) and can be induced by either transmembrane electrical potential or transmembrane Na(+) concentration difference. It was shown earlier that in the former case the initial transport rate is a fourth-power function of the magnitude of the electrochemical potential difference of sodium ions, and in the latter, a second-power function. A possible interpretation of this finding is cooperativity of sodium-transporting sites in the transport carrier. When both kinds of driving force are imposed simultaneously on the vesicles, fourth-power dependence on the total potential difference of sodium ions is obtained, suggesting that the transport carrier is regulated by the electrical potential. Heat treatment of the vesicles at 48 C partially inactivates transport and abolishes this effect of the electrical potential.
Document ID
19790047968
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lanyi, J. K.
(NASA Ames Research Center Extraterrestrial Biology Div., Moffett Field, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
December 1, 1978
Publication Information
Publication: Archives of Biochemistry and Biophysics
Volume: 191
Subject Category
Chemistry And Materials (General)
Accession Number
79A31981
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available