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Light-activated amino acid transport in Halobacterium halobium envelope vesiclesVesicles prepared from Halobacterium halobium cell envelopes accumulate amino acids in response to light-induced electrical and chemical gradients. Nineteen of 20 commonly occurring amino acids have been shown to be actively accumulated by these vesicles in response to illumination or in response to an artificially created Na+ gradient. On the basis of shared common carriers the transport systems can be divided into eight classes, each responsible for the transport of one or several amino acids: arginine, lysine, histidine; asparagine, glutamine; alanine, glycine, threonine, serine; leucine, valine, isoleucine, methionine; phenylalanine, tyrosine, tryptophan; aspartate; glutamate; proline. Available evidence suggests that these carriers are symmetrical in that amino acids can be transported equally well in both directions across the vesicle membranes. A tentative working model to account for these observations is presented.
Document ID
19770056059
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Macdonald, R. E.
(Cornell University Ithaca, N.Y., United States)
Lanyi, J. K.
(NASA Ames Research Center Biological Adaptation Branch, Moffett Field, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
May 1, 1977
Subject Category
Life Sciences (General)
Accession Number
77A38911
Funding Number(s)
CONTRACT_GRANT: NSG-7235
Distribution Limits
Public
Copyright
Other

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