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Chemotaxis to the quorum-sensing signal AI-2 requires the Tsr chemoreceptor and the periplasmic LsrB AI-2-binding protein.
AI-2 is an autoinducer made by many bacteria. LsrB binds AI-2 in the periplasm, and Tsr is the l-serine chemoreceptor. We show that AI-2 strongly attracts Escherichia coli. Both LsrB and Tsr areExpand
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Chemotaxis of Escherichia coli to norepinephrine (NE) requires conversion of NE to 3,4-dihydroxymandelic acid.
Norepinephrine (NE), the primary neurotransmitter of the sympathetic nervous system, has been reported to be a chemoattractant for enterohemorrhagic Escherichia coli (EHEC). Here we show thatExpand
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Cyclic mRNA expression of thyrotropin subunits and deiodinases in red drum, Sciaenops ocellatus.
The role of thyrotropin (thyroid-stimulating hormone, TSH) in driving peripheral thyroid function in non-mammalian species is still poorly understood. Thyroxine (T₄), the principal hormone releasedExpand
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Molecular cloning and regulation of mRNA expression of the thyrotropin β and glycoprotein hormone α subunits in red drum, Sciaenops ocellatus
Full-length cDNAs for thyrotropin β (TSHβ) and glycoprotein hormone α (GSUα) subunits were cloned and sequenced from the red drum (Sciaenops ocellatus). The cDNAs for TSHβ (877 bp) and GSUα (661 bp)Expand
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Regulation of enzyme synthesis in the tryptophan pathway of Acinetobacter calcoaceticus.
In Acinetobacter calcoaceticus the seven genes coding for the enzymes responsible for tryptophan synthesis map at three chromosomal locations. Two three-gene clusters, one (trpGDC) specifying theExpand
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N-(5-Phosphoribosyl)anthranilate isomerase-indoleglycerol-phosphate synthase. 2. Fast-reaction studies show that a fluorescent substrate analogue binds independently to two different sites.
The mechanism of binding of reduced 1-(2-carboxyphenylamino)-1-deoxyribulose 5-phosphate (rCdRP) to two different binding sites on the bifunctional enzyme is determined by kinetic studies, usingExpand
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Regulation of ornithine decarboxylase mRNA by phorbol esters and insulin in normal and C‐kinase‐deficient rat hepatoma cells
Tumor‐promoting phorbol esters and insulin produce similar effects in Reuber H35 rat hepatoma cell proliferation, including increased ornithine decarboxylase (ODC) enzyme activity, DNA synthesis, andExpand
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Negative feedback regulation of thyrotropin subunits and pituitary deiodinases in red drum, Sciaenops ocellatus.
Thyroxine (T4) undergoes dynamic daily cycles in the perciform fish the red drum, Sciaenops ocellatus, that are inversely timed to cycles of thyrotropin (TSH) subunit mRNA expression in the pituitaryExpand
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Regulation ofEnzymeSynthesis intheTryptophan Pathway ofAcinetobacter calcoaceticus
InAcinetobacter calcoaceticus theseven genescoding fortheenzymes responsible fortryptophan synthesis map atthree chromosomal locations. Twothreegene clusters, one (trpGDC) specifying thesmallsubunitExpand
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