Tamar Geiger
Mar 1, 2012; 11:M111.014050-M111.014050
Special Issue: Prospects in Space and Time

Timothy J. Griffin
Apr 1, 2002; 1:323-333
Research

Guoan Chen
Apr 1, 2002; 1:304-313
Research

Qiang Tian
Oct 1, 2004; 3:960-969
Research

Linn Fagerberg
Feb 1, 2014; 13:397-406
Research

Shao-En Ong
May 1, 2002; 1:376-386
Research

Aldehyde oxidases (AOXs) are a small group of enzymes belonging to the larger family of molybdo-flavoenzymes, along with the well-characterized xanthine oxidoreductase. The two major types of reactions that are catalyzed by AOXs are the hydroxylation of heterocycles and the oxidation of aldehydes to their corresponding carboxylic acids. Different animal species have different complements of AOX genes. The two extremes are represented in humans and rodents; whereas the human genome contains a single active gene (AOX1), those of rodents, such as mice, are endowed with four genes (Aox1-4), clustering on the same chromosome, each encoding a functionally distinct AOX enzyme. It still remains enigmatic why some species have numerous AOX enzymes, whereas others harbor only one functional enzyme. At present, little is known about the physiological relevance of AOX enzymes in humans and their additional forms in other mammals. These enzymes are expressed in the liver and play an important role in the metabolisms of drugs and other xenobiotics. In this review, we discuss the expression, tissue-specific roles, and substrate specificities of the different mammalian AOX enzymes and highlight insights into their physiological roles.

Under 35s Forum

Event participants

Research Event

Event participants

Sherif Elsayed-Ali, Head of Technology and Human Rights, Amnesty International
Professor David Kaye, UN Special Rapporteur on the Promotion and Protection of the Right to Freedom of Opinion and Expression
Chair: Sonya Sceats, Associate Fellow, International Law Programme, Chatham House

You’re a fantasy writer. You’ve created an amazing and original world, full of wondrous magic, mind-blowing monsters, and fascinating new cultures. You’ve got powerful heroes, menacing villains, and mysterious mentors. There’s just the right amount of romance.

In short, you’ve got all that good stuff you’d expect to find in a fantasy novel.

Only, somehow it’s still not coming out quite as awe-inspiring as you’d envisioned it.

Today, I’ve got three tips for you on how to make your awesome stuff seem more awesome.

Establish the Norm

“When everything is awesome, awesome becomes average.”

Every now and then, I come across a book that begins with the writer very obviously trying to impress me with how cool their main character is, and what an amazing world they have created, and how scary the villain is. All at once. In the first chapter.

It rarely works.

Let’s say there’s a ballroom full of ultra-rich and mega-powerful vampires, and then someone flies in on a golden unicorn and starts shooting fireballs the shape of grinning skulls.

That would probably look rather spectacular as an introduction to a movie, but does it work in a book?

Continue reading Make It Awesome — Three Tips for Impressing Your Readers at Mythic Scribes.

James E. Balmer
Nov 1, 2002; 43:1773-1808
Reviews

DL Brasaemle
Nov 1, 1997; 38:2249-2263
Articles

K Schoonjans
May 1, 1996; 37:907-925
Reviews

Invitation Only Research Event

Event participants

pncRNA-D is an irradiation-induced 602-nt long noncoding RNA transcribed from the promoter region of the cyclin D1 (CCND1) gene. CCND1 expression is predicted to be inhibited through an interplay between pncRNA-D and RNA-binding protein TLS/FUS. Because the pncRNA-D–TLS interaction is essential for pncRNA-D–stimulated CCND1 inhibition, here we studied the possible role of RNA modification in this interaction in HeLa cells. We found that osmotic stress induces pncRNA-D by recruiting RNA polymerase II to its promoter. pncRNA-D was highly m6A-methylated in control cells, but osmotic stress reduced the methylation and also arginine methylation of TLS in the nucleus. Knockdown of the m6A modification enzyme methyltransferase-like 3 (METTL3) prolonged the half-life of pncRNA-D, and among the known m6A recognition proteins, YTH domain-containing 1 (YTHDC1) was responsible for binding m6A of pncRNA-D. Knockdown of METTL3 or YTHDC1 also enhanced the interaction of pncRNA-D with TLS, and results from RNA pulldown assays implicated YTHDC1 in the inhibitory effect on the TLS–pncRNA-D interaction. CRISPR/Cas9-mediated deletion of candidate m6A site decreased the m6A level in pncRNA-D and altered its interaction with the RNA-binding proteins. Of note, a reduction in the m6A modification arrested the cell cycle at the G0/G1 phase, and pncRNA-D knockdown partially reversed this arrest. Moreover, pncRNA-D induction in HeLa cells significantly suppressed cell growth. Collectively, these findings suggest that m6A modification of the long noncoding RNA pncRNA-D plays a role in the regulation of CCND1 gene expression and cell cycle progression.

The arrangement of functionally-related genes in operons is a fundamental element of how genetic information is organized in prokaryotes. This organization ensures coordinated gene expression by co-transcription. Often, however, alternative genetic responses to specific stress conditions demand the discoordination of operon expression. During cold temperature stress, accumulation of the gene encoding the sole Asp–Glu–Ala–Asp (DEAD)-box RNA helicase in Synechocystis sp. PCC 6803, crhR (slr0083), increases 15-fold. Here, we show that crhR is expressed from a dicistronic operon with the methylthiotransferase rimO/miaB (slr0082) gene, followed by rapid processing of the operon transcript into two monocistronic mRNAs. This cleavage event is required for and results in destabilization of the rimO transcript. Results from secondary structure modeling and analysis of RNase E cleavage of the rimO–crhR transcript in vitro suggested that CrhR plays a role in enhancing the rate of the processing in an auto-regulatory manner. Moreover, two putative small RNAs are generated from additional processing, degradation, or both of the rimO transcript. These results suggest a role for the bacterial RNA helicase CrhR in RNase E-dependent mRNA processing in Synechocystis and expand the known range of organisms possessing small RNAs derived from processing of mRNA transcripts.