UPTAKE OF AMINO ACIDS BY PAREURYTHOE CALIFORNICA: SUBSTRATE INTERACTION MODIFIES NET INFLUX FROM THE ENVIRONMENT

The Biological Bulletin
Steven J O'Dell, Grover C Stephens

Abstract

Pareurythoe californica is capable of simultaneous net uptake of 18 amino acids, each present at an initial concentration of 200 nM. Rates of uptake are comparable for all amino acids tested. Kinetics of uptake are well described by the Michaelis-Menten equation. Neither bacteria nor other epifauna play a significant role in the observed uptake. The net entry of the amino acids tested was inhibited in the presence of equimolar concentrations of representatives of all major classes of amino acids (i.e., polar and nonpolar neutral, dicarboxylic, polybasic) at concentrations comparable to those found in the environment. Thus, a mixture mimicking the composition and concentration of substrates normally present in the environment was used to obtain a more realistic estimate of entry rates under natural conditions. When this was done, the contribution of exogenous amino acids to the nitrogen needs (based on ammonia excretion) and the requirement for reduced carbon (based on oxygen consumption) of Pareurythoe ranged from 10% to 50%, depending on levels of substrate available in the environment.

Citations

Feb 24, 1988·Biochimica Et Biophysica Acta·G C Stephens

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.