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Annual Review of Biochemistry

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https://www.readbyqxmd.com/read/28226215/multiple-functions-and-regulation-of-mammalian-peroxiredoxins
#1
Sue Goo Rhee, In Sup Kil
Peroxiredoxins (Prxs) constitute a major family of peroxidases, with mammalian cells expressing six Prx isoforms (PrxI to PrxVI). Cells produce hydrogen peroxide (H2O2) at various intracellular locations where it can serve as a signaling molecule. Given that Prxs are abundant and possess a structure that renders the cysteine (Cys) residue at the active site highly sensitive to oxidation by H2O2, the signaling function of this oxidant requires extensive and highly localized regulation. Recent findings on the reversible regulation of PrxI through phosphorylation at the centrosome and on the hyperoxidation of the Cys at the active site of PrxIII in mitochondria are described in this review as examples of such local regulation of H2O2 signaling...
February 2, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28141967/telomerase-mechanism-of-telomere-synthesis
#2
R Alex Wu, Heather E Upton, Jacob M Vogan, Kathleen Collins
Telomerase is the essential reverse transcriptase required for linear chromosome maintenance in most eukaryotes. Telomerase supplements the tandem array of simple-sequence repeats at chromosome ends to compensate for the DNA erosion inherent in genome replication. The template for telomerase reverse transcriptase is within the RNA subunit of the ribonucleoprotein complex, which in cells contains additional telomerase holoenzyme proteins that assemble the active ribonucleoprotein and promote its function at telomeres...
January 30, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28125290/molecular-characteristics-and-biological-functions-of-surface-active-and-surfactant-proteins
#3
Margaret Sunde, Chi L L Pham, Ann H Kwan
Many critical biological processes take place at hydrophobic:hydrophilic interfaces, and a wide range of organisms produce surface-active proteins and peptides that reduce surface and interfacial tension and mediate growth and development at these boundaries. Microorganisms produce both small lipid-associated peptides and amphipathic proteins that allow growth across water:air boundaries, attachment to surfaces, predation, and improved bioavailability of hydrophobic substrates. Higher-order organisms produce surface-active proteins with a wide variety of functions, including the provision of protective foam environments for vulnerable reproductive stages, evaporative cooling, and gas exchange across airway membranes...
January 11, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28125288/at-the-intersection-of-chemistry-biology-and-medicine
#4
Christopher T Walsh
After an undergraduate degree in biology at Harvard, I started graduate school at The Rockefeller Institute for Medical Research in New York City in July 1965. I was attracted to the chemical side of biochemistry and joined Fritz Lipmann's large, hierarchical laboratory to study enzyme mechanisms. That work led to postdoctoral research with Robert Abeles at Brandeis, then a center of what, 30 years later, would be called chemical biology. I spent 15 years on the Massachusetts Institute of Technology faculty, in both the Chemistry and Biology Departments, and then 26 years on the Harvard Medical School Faculty...
January 11, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28125289/structural-studies-of-amyloid-proteins-at-the-molecular-level
#5
David S Eisenberg, Michael R Sawaya
Dozens of proteins are known to convert to the aggregated amyloid state. These include fibrils associated with systemic and neurodegenerative diseases and cancer, functional amyloid fibrils in microorganisms and animals, and many denatured proteins. Amyloid fibrils can be much more stable than other protein assemblies. In contrast to globular proteins, a single protein sequence can aggregate into several distinctly different amyloid structures, termed polymorphs, and a given polymorph can reproduce itself by seeding...
January 3, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27294441/the-biochemistry-of-o-glcnac-transferase-which-functions-make-it-essential-in-mammalian-cells
#6
Zebulon G Levine, Suzanne Walker
O-linked N-acetylglucosamine transferase (OGT) is found in all metazoans and plays an important role in development but at the single-cell level is only essential in dividing mammalian cells. Postmitotic mammalian cells and cells of invertebrates such as Caenorhabditis elegans and Drosophila can survive without copies of OGT. Why OGT is required in dividing mammalian cells but not in other cells remains unknown. OGT has multiple biochemical activities. Beyond its well-known role in adding β-O-GlcNAc to serine and threonine residues of nuclear and cytoplasmic proteins, OGT also acts as a protease in the maturation of the cell cycle regulator host cell factor 1 (HCF-1) and serves as an integral member of several protein complexes, many of them linked to gene expression...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27294440/nucleic-acid-based-nanodevices-in-biological-imaging
#7
Kasturi Chakraborty, Aneesh T Veetil, Samie R Jaffrey, Yamuna Krishnan
The nanoscale engineering of nucleic acids has led to exciting molecular technologies for high-end biological imaging. The predictable base pairing, high programmability, and superior new chemical and biological methods used to access nucleic acids with diverse lengths and in high purity, coupled with computational tools for their design, have allowed the creation of a stunning diversity of nucleic acid-based nanodevices. Given their biological origin, such synthetic devices have a tremendous capacity to interface with the biological world, and this capacity lies at the heart of several nucleic acid-based technologies that are finding applications in biological systems...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27294439/nucleotide-excision-repair-and-transcriptional-regulation-tfiih-and-beyond
#8
Emmanuel Compe, Jean-Marc Egly
Transcription factor IIH (TFIIH) is a multiprotein complex involved in both transcription and DNA repair, revealing a striking functional link between these two processes. Some of its subunits also belong to complexes involved in other cellular processes, such as chromosome segregation and cell cycle regulation, emphasizing the multitasking capabilities of this factor. This review aims to depict the structure of TFIIH and to dissect the roles of its subunits in different cellular mechanisms. Our understanding of the biochemistry of TFIIH has greatly benefited from studies focused on diseases related to TFIIH mutations...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27294438/signaling-networks-determining-life-span
#9
Celine E Riera, Carsten Merkwirth, C Daniel De Magalhaes Filho, Andrew Dillin
The health of an organism is orchestrated by a multitude of molecular and biochemical networks responsible for ensuring homeostasis within cells and tissues. However, upon aging, a progressive failure in the maintenance of this homeostatic balance occurs in response to a variety of endogenous and environmental stresses, allowing the accumulation of damage, the physiological decline of individual tissues, and susceptibility to diseases. What are the molecular and cellular signaling events that control the aging process and how can this knowledge help design therapeutic strategies to combat age-associated diseases? Here we provide a comprehensive overview of the evolutionarily conserved biological processes that alter the rate of aging and discuss their link to disease prevention and the extension of healthy life span...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145846/mechanisms-of-mitotic-spindle-assembly
#10
Sabine Petry
Life depends on cell proliferation and the accurate segregation of chromosomes, which are mediated by the microtubule (MT)-based mitotic spindle and ∼200 essential MT-associated proteins. Yet, a mechanistic understanding of how the mitotic spindle is assembled and achieves chromosome segregation is still missing. This is mostly due to the density of MTs in the spindle, which presumably precludes their direct observation. Recent insight has been gained into the molecular building plan of the metaphase spindle using bulk and single-molecule measurements combined with computational modeling...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145845/understanding-the-chemistry-and-biology-of-glycosylation-with-glycan-synthesis
#11
Larissa Krasnova, Chi-Huey Wong
Glycoscience research has been significantly impeded by the complex compositions of the glycans present in biological molecules and the lack of convenient tools suitable for studying the glycosylation process and its function. Polysaccharides and glycoconjugates are not encoded directly by genes; instead, their biosynthesis relies on the differential expression of carbohydrate enzymes, resulting in heterogeneous mixtures of glycoforms, each with a distinct physiological activity. Access to well-defined structures is required for functional study, and this has been provided by chemical and enzymatic synthesis and by the engineering of glycosylation pathways...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145844/ice-binding-proteins-and-their-function
#12
Maya Bar Dolev, Ido Braslavsky, Peter L Davies
Ice-binding proteins (IBPs) are a diverse class of proteins that assist organism survival in the presence of ice in cold climates. They have different origins in many organisms, including bacteria, fungi, algae, diatoms, plants, insects, and fish. This review covers the gamut of IBP structures and functions and the common features they use to bind ice. We discuss mechanisms by which IBPs adsorb to ice and interfere with its growth, evidence for their irreversible association with ice, and methods for enhancing the activity of IBPs...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145843/crispr-cas9-in-genome-editing-and-beyond
#13
Haifeng Wang, Marie La Russa, Lei S Qi
The Cas9 protein (CRISPR-associated protein 9), derived from type II CRISPR (clustered regularly interspaced short palindromic repeats) bacterial immune systems, is emerging as a powerful tool for engineering the genome in diverse organisms. As an RNA-guided DNA endonuclease, Cas9 can be easily programmed to target new sites by altering its guide RNA sequence, and its development as a tool has made sequence-specific gene editing several magnitudes easier. The nuclease-deactivated form of Cas9 further provides a versatile RNA-guided DNA-targeting platform for regulating and imaging the genome, as well as for rewriting the epigenetic status, all in a sequence-specific manner...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145842/dietary-protein-metabolism-and-aging
#14
George A Soultoukis, Linda Partridge
Dietary restriction (DR), a moderate reduction in food intake, improves health during aging and extends life span across multiple species. Specific nutrients, rather than overall calories, mediate the effects of DR, with protein and specific amino acids (AAs) playing a key role. Modulations of single dietary AAs affect traits including growth, reproduction, physiology, health, and longevity in animals. Epidemiological data in humans also link the quality and quantity of dietary proteins to long-term health...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145841/enjoy-the-trip-calcium-in-mitochondria-back-and-forth
#15
Diego De Stefani, Rosario Rizzuto, Tullio Pozzan
In the last 5 years, most of the molecules that control mitochondrial Ca(2+) homeostasis have been finally identified. Mitochondrial Ca(2+) uptake is mediated by the Mitochondrial Calcium Uniporter (MCU) complex, a macromolecular structure that guarantees Ca(2+) accumulation inside mitochondrial matrix upon increases in cytosolic Ca(2+). Conversely, Ca(2+) release is under the control of the Na(+)/Ca(2+) exchanger, encoded by the NCLX gene, and of a H(+)/Ca(2+) antiporter, whose identity is still debated. The low affinity of the MCU complex, coupled to the activity of the efflux systems, protects cells from continuous futile cycles of Ca(2+) across the inner mitochondrial membrane and consequent massive energy dissipation...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145840/the-p53-pathway-origins-inactivation-in-cancer-and-emerging-therapeutic-approaches
#16
Andreas C Joerger, Alan R Fersht
Inactivation of the transcription factor p53, through either direct mutation or aberrations in one of its many regulatory pathways, is a hallmark of virtually every tumor. In recent years, screening for p53 activators and a better understanding of the molecular mechanisms of oncogenic perturbations of p53 function have opened up a host of novel avenues for therapeutic intervention in cancer: from the structure-guided design of chemical chaperones to restore the function of conformationally unstable p53 cancer mutants, to the development of potent antagonists of the negative regulators MDM2 and MDMX and other modulators of the p53 pathway for the treatment of cancers with wild-type p53...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27145839/radical-s-adenosylmethionine-enzymes-in-human-health-and-disease
#17
Bradley J Landgraf, Erin L McCarthy, Squire J Booker
Radical S-adenosylmethionine (SAM) enzymes catalyze an astonishing array of complex and chemically challenging reactions across all domains of life. Of approximately 114,000 of these enzymes, 8 are known to be present in humans: MOCS1, molybdenum cofactor biosynthesis; LIAS, lipoic acid biosynthesis; CDK5RAP1, 2-methylthio-N(6)-isopentenyladenosine biosynthesis; CDKAL1, methylthio-N(6)-threonylcarbamoyladenosine biosynthesis; TYW1, wybutosine biosynthesis; ELP3, 5-methoxycarbonylmethyl uridine; and RSAD1 and viperin, both of unknown function...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27088880/mechanics-and-single-molecule-interrogation-of-dna-recombination
#18
Jason C Bell, Stephen C Kowalczykowski
The repair of DNA by homologous recombination is an essential, efficient, and high-fidelity process that mends DNA lesions formed during cellular metabolism; these lesions include double-stranded DNA breaks, daughter-strand gaps, and DNA cross-links. Genetic defects in the homologous recombination pathway undermine genomic integrity and cause the accumulation of gross chromosomal abnormalities-including rearrangements, deletions, and aneuploidy-that contribute to cancer formation. Recombination proceeds through the formation of joint DNA molecules-homologously paired but metastable DNA intermediates that are processed by several alternative subpathways-making recombination a versatile and robust mechanism to repair damaged chromosomes...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27088879/the-substrate-specificity-of-sirtuins
#19
Poonam Bheda, Hui Jing, Cynthia Wolberger, Hening Lin
Sirtuins are NAD(+)-dependent enzymes universally present in all organisms, where they play central roles in regulating numerous biological processes. Although early studies showed that sirtuins deacetylated lysines in a reaction that consumes NAD(+), more recent studies have revealed that these enzymes can remove a variety of acyl-lysine modifications. The specificities for varied acyl modifications may thus underlie the distinct roles of the different sirtuins within a given organism. This review summarizes the structure, chemistry, and substrate specificity of sirtuins with a focus on how different sirtuins recognize distinct substrates and thus carry out specific functions...
June 2, 2016: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/27058308/mitochondrial-gene-expression-a-playground-of-evolutionary-tinkering
#20
Walter Neupert
This article introduces the Mitochondria theme of the Annual Review of Biochemistry, Volume 85.
June 2, 2016: Annual Review of Biochemistry
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