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Ribonuclease A: Disulfide Bonds, Conformational Stability, and Cytotoxicity
Ribonuclease A: Disulfide Bonds, Conformational Stability, and Cytotoxicity by Tony A. Klink A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Biochemistry) at the UNIVERSITY OF WISCONSIN-MADISON 2()()() r OJ A dissertation entitled Ribonuclease A: Disulfide Bonds, Conformational Stability and Cytotoxicity submitted to the Graduate School of the University of Wisconsin-Madison in partial fulfillment of the requirements for the degree of Doctor of Philosophy by Tony Anthony Klink Date of Final Oral Examination: August 4, 2000 Month & Year Degree to be awarded: December May August 2000 • * * * * * * • * * • * • • • • • * • • • * • • • • • • • • • • • • • * * • * • * * * • * • * • • • • • • * App oval Signature. f Dissertation Readers: Signature, Dean of Graduate School ---..., v.C~vJ,1A. 5. lJ,~k;at 1 Abstract Disulfide bonds between the side chains of cysteine residues are the only common cross links in proteins. Bovine pancreatic ribonuclease A (RNase A) is a 124-residue enzyme that contains four interweaving disulfide bonds (Cys26-Cys84, Cys40-Cys95, Cys58-CysllO, and Cys65-Cys72) and catalyzes the cleavage of RNA. The contribution of each disulfide bond to the confonnational stability and catalytic activity of RNase A was detennined using variants in which each cystine was replaced independently with a pair of alanine residues. Of the four disulfide bonds, the Cys40-Cys95 and Cys65-Cys72 cross-links are the least important to confonnational stability. Removing these disulfide bonds leads to RNase A variants that have Tm values below that of the wild-type enzyme but above physiological temperature. Unlike wild-type RNase A. G88R RNase A is toxic to cancer cells. To investigate the relationship between conformational stability and cytotoxicity, the C40AlC95A and C65A1C72A variants were made in the G88R background. -
Determination of Pk, Values of the Histidine Side
Protein Science (1997), 6:1937-1944. Cambridge University Press. Printed in the USA Copyright 0 1997 The Protein Society Determination of pK, values of the histidine side chains of phosphatidylinositol-specific phospholipase C from Bacillus cereus by NMR spectroscopy and site-directed mutagenesis TUN LIU, MARGRET RYAN, FREDERICK W. DAHLQUIST, AND 0. HAYES GRIFFITH Institute of Molecular Biology and Department of Chemistry, University of Oregon, Eugene, Oregon 97403 (RECEIVEDDecember 4, 1996: ACCEPTEDMay 19, 1997) Abstract Two active site histidine residues have been implicated in the catalysis of phosphatidylinositol-specific phospholipase C (PI-PLC). In this report, we present the first study of the pK,, values of histidines of a PI-PLC. All six histidines of Bacillus cereus PI-PLC were studied by 2D NMR spectroscopy and site-directed mutagenesis. The protein was selec- tively labeled with '3C"-histidine. A series of 'H-I3C HSQC NMR spectra were acquired over a pH range of 4.0-9.0. Five of the six histidines have been individually substituted with alanine to aid the resonance assignments in the NMR spectra. Overall, the remaining histidines in the mutants show little chemical shift changes in the 'H-"C HSQC spectra, indicating that the alanine substitution has no effect on the tertiary structure of the protein. H32A and H82A mutants are inactive enzymes, while H92A and H61A are fully active, and H81A retains about 15% of the wild-type activity. The active site histidines, His32 and His82, display pK,, values of 7.6 and 6.9, respectively. His92 and His227 exhibit pK, values of 5.4 and 6.9. -
The Role and Mechanisms of Action of Micrornas in Cancer Drug Resistance Wengong Si1,2,3, Jiaying Shen4, Huilin Zheng1,5 and Weimin Fan1,6*
Si et al. Clinical Epigenetics (2019) 11:25 https://doi.org/10.1186/s13148-018-0587-8 REVIEW Open Access The role and mechanisms of action of microRNAs in cancer drug resistance Wengong Si1,2,3, Jiaying Shen4, Huilin Zheng1,5 and Weimin Fan1,6* Abstract MicroRNAs (miRNAs) are small non-coding RNAs with a length of about 19–25 nt, which can regulate various target genes and are thus involved in the regulation of a variety of biological and pathological processes, including the formation and development of cancer. Drug resistance in cancer chemotherapy is one of the main obstacles to curing this malignant disease. Statistical data indicate that over 90% of the mortality of patients with cancer is related to drug resistance. Drug resistance of cancer chemotherapy can be caused by many mechanisms, such as decreased antitumor drug uptake, modified drug targets, altered cell cycle checkpoints, or increased DNA damage repair, among others. In recent years, many studies have shown that miRNAs are involved in the drug resistance of tumor cells by targeting drug-resistance-related genes or influencing genes related to cell proliferation, cell cycle, and apoptosis. A single miRNA often targets a number of genes, and its regulatory effect is tissue-specific. In this review, we emphasize the miRNAs that are involved in the regulation of drug resistance among different cancers and probe the mechanisms of the deregulated expression of miRNAs. The molecular targets of miRNAs and their underlying signaling pathways are also explored comprehensively. A holistic understanding of the functions of miRNAs in drug resistance will help us develop better strategies to regulate them efficiently and will finally pave the way toward better translation of miRNAs into clinics, developing them into a promising approach in cancer therapy. -
Families and the Structural Relatedness Among Globular Proteins
Protein Science (1993), 2, 884-899. Cambridge University Press. Printed in the USA. Copyright 0 1993 The Protein Society -~~ ~~~~ ~ Families and the structural relatedness among globular proteins DAVID P. YEE AND KEN A. DILL Department of Pharmaceutical Chemistry, University of California, San Francisco, California94143-1204 (RECEIVEDJanuary 6, 1993; REVISEDMANUSCRIPT RECEIVED February 18, 1993) Abstract Protein structures come in families. Are families “closely knit” or “loosely knit” entities? We describe a mea- sure of relatedness among polymer conformations. Based on weighted distance maps, this measure differs from existing measures mainly in two respects: (1) it is computationally fast, and (2) it can compare any two proteins, regardless of their relative chain lengths or degree of similarity. It does not require finding relative alignments. The measure is used here to determine the dissimilarities between all 12,403 possible pairs of 158 diverse protein structures from the Brookhaven Protein Data Bank (PDB). Combined with minimal spanning trees and hier- archical clustering methods,this measure is used to define structural families. It is also useful for rapidly searching a dataset of protein structures for specific substructural motifs.By using an analogy to distributions of Euclid- ean distances, we find that protein families are not tightly knit entities. Keywords: protein family; relatedness; structural comparison; substructure searches Pioneering work over the past 20 years has shown that positions after superposition. RMS is a useful distance proteins fall into families of related structures (Levitt & metric for comparingstructures that arenearly identical: Chothia, 1976; Richardson, 1981; Richardson & Richard- for example, when refining or comparing structures ob- son, 1989; Chothia & Finkelstein, 1990). -
140503 IPF Signatures Supplement Withfigs Thorax
Supplementary material for Heterogeneous gene expression signatures correspond to distinct lung pathologies and biomarkers of disease severity in idiopathic pulmonary fibrosis Daryle J. DePianto1*, Sanjay Chandriani1⌘*, Alexander R. Abbas1, Guiquan Jia1, Elsa N. N’Diaye1, Patrick Caplazi1, Steven E. Kauder1, Sabyasachi Biswas1, Satyajit K. Karnik1#, Connie Ha1, Zora Modrusan1, Michael A. Matthay2, Jasleen Kukreja3, Harold R. Collard2, Jackson G. Egen1, Paul J. Wolters2§, and Joseph R. Arron1§ 1Genentech Research and Early Development, South San Francisco, CA 2Department of Medicine, University of California, San Francisco, CA 3Department of Surgery, University of California, San Francisco, CA ⌘Current address: Novartis Institutes for Biomedical Research, Emeryville, CA. #Current address: Gilead Sciences, Foster City, CA. *DJD and SC contributed equally to this manuscript §PJW and JRA co-directed this project Address correspondence to Paul J. Wolters, MD University of California, San Francisco Department of Medicine Box 0111 San Francisco, CA 94143-0111 [email protected] or Joseph R. Arron, MD, PhD Genentech, Inc. MS 231C 1 DNA Way South San Francisco, CA 94080 [email protected] 1 METHODS Human lung tissue samples Tissues were obtained at UCSF from clinical samples from IPF patients at the time of biopsy or lung transplantation. All patients were seen at UCSF and the diagnosis of IPF was established through multidisciplinary review of clinical, radiological, and pathological data according to criteria established by the consensus classification of the American Thoracic Society (ATS) and European Respiratory Society (ERS), Japanese Respiratory Society (JRS), and the Latin American Thoracic Association (ALAT) (ref. 5 in main text). Non-diseased normal lung tissues were procured from lungs not used by the Northern California Transplant Donor Network. -
Structures, Functions, and Mechanisms of Filament Forming Enzymes: a Renaissance of Enzyme Filamentation
Structures, Functions, and Mechanisms of Filament Forming Enzymes: A Renaissance of Enzyme Filamentation A Review By Chad K. Park & Nancy C. Horton Department of Molecular and Cellular Biology University of Arizona Tucson, AZ 85721 N. C. Horton ([email protected], ORCID: 0000-0003-2710-8284) C. K. Park ([email protected], ORCID: 0000-0003-1089-9091) Keywords: Enzyme, Regulation, DNA binding, Nuclease, Run-On Oligomerization, self-association 1 Abstract Filament formation by non-cytoskeletal enzymes has been known for decades, yet only relatively recently has its wide-spread role in enzyme regulation and biology come to be appreciated. This comprehensive review summarizes what is known for each enzyme confirmed to form filamentous structures in vitro, and for the many that are known only to form large self-assemblies within cells. For some enzymes, studies describing both the in vitro filamentous structures and cellular self-assembly formation are also known and described. Special attention is paid to the detailed structures of each type of enzyme filament, as well as the roles the structures play in enzyme regulation and in biology. Where it is known or hypothesized, the advantages conferred by enzyme filamentation are reviewed. Finally, the similarities, differences, and comparison to the SgrAI system are also highlighted. 2 Contents INTRODUCTION…………………………………………………………..4 STRUCTURALLY CHARACTERIZED ENZYME FILAMENTS…….5 Acetyl CoA Carboxylase (ACC)……………………………………………………………………5 Phosphofructokinase (PFK)……………………………………………………………………….6 -
Purification and Characterization of Cutinase from Venturia Inaequalis
Physiology and Biochemistry Purification and Characterization of Cutinase from Venturia inaequalis Wolfram K611er and Diana M. Parker Assistant professor and research assistant, Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva 14456. We thank Professor A. L. Jones for the isolates of Venturia inaequalis, Mr. Robert W. Ennis, Jr. for his help in cutin preparation, and Comstock Foods, Alton, NY, for the apple peels. Accepted for publication 16 August 1988. ABSTRACT K61ler, W., and Parker, D. M. 1989. Purification and characterization of cutinase from Venturia inaequalis. Phytopathology 79:278-283. Venturia inaequalis was grown in a culture medium containing purified cutinase from V. inaequalisis optimal at a pH of 6 and thus different from apple cutin as the sole carbon source. After 8 wk of growth an esterase was the alkaline pH-optimum reported for other purified cutinases. The isolated from the culture fluid and purified to apparent homogeneity. The hydrolysis of the model esterp-nitrophenyl butyrate was less affected by the enzyme hydrolyzed tritiated cutin and thus was identified as cutinase. The pH. The esterase activity was strongly inhibited by diisopropyl purified cutinase is a glycoprotein with a molecular mass of 21-23 kg/ mol, fluorophosphate, and the phosphorylation of one serine was sufficient for as determined by various procedures. Remarkable structural features are a complete inhibition. Thus, cutinase from V. inaequalis belongs to the class high content of glycine, a high content of nonpolar amino acids, two of serine hydrolases, a characterisitic shared with other fungal cutinases. disulfide bridges, and a high degree of hydrophobicity. -
Supplemental Information For
Supplemental Information for: Gene Expression Profiling of Pediatric Acute Myelogenous Leukemia Mary E. Ross, Rami Mahfouz, Mihaela Onciu, Hsi-Che Liu, Xiaodong Zhou, Guangchun Song, Sheila A. Shurtleff, Stanley Pounds, Cheng Cheng, Jing Ma, Raul C. Ribeiro, Jeffrey E. Rubnitz, Kevin Girtman, W. Kent Williams, Susana C. Raimondi, Der-Cherng Liang, Lee-Yung Shih, Ching-Hon Pui & James R. Downing Table of Contents Section I. Patient Datasets Table S1. Diagnostic AML characteristics Table S2. Cytogenetics Summary Table S3. Adult diagnostic AML characteristics Table S4. Additional T-ALL characteristics Section II. Methods Table S5. Summary of filtered probe sets Table S6. MLL-PTD primers Additional Statistical Methods Section III. Genetic Subtype Discriminating Genes Figure S1. Unsupervised Heirarchical clustering Figure S2. Heirarchical clustering with class discriminating genes Table S7. Top 100 probe sets selected by SAM for t(8;21)[AML1-ETO] Table S8. Top 100 probe sets selected by SAM for t(15;17) [PML-RARα] Table S9. Top 63 probe sets selected by SAM for inv(16) [CBFβ-MYH11] Table S10. Top 100 probe sets selected by SAM for MLL chimeric fusion genes Table S11. Top 100 probe sets selected by SAM for FAB-M7 Table S12. Top 100 probe sets selected by SAM for CBF leukemias (whole dataset) Section IV. MLL in combined ALL and AML dataset Table S13. Top 100 probe sets selected by SAM for MLL chimeric fusions irrespective of blast lineage (whole dataset) Table S14. Class discriminating genes for cases with an MLL chimeric fusion gene that show uniform high expression, irrespective of blast lineage Section V. -
Ribonuclease A: Exploring the Function of the Active-Site Lysine
Ribonuclease A: Exploring the Function of the Active-Site Lysine Residue in Catalysis and Inhibition By June M. Messmore A dissertation submitted in partial fulfillment of the degree of Doctor of Philosophy (Biochemistry) UNIVERSITY OF WISCONSIN-MADISON 1999 A dissertation entitled Ribonuclease A: Exploring the Function of the Active-Site Lysine Residue in Catalysis and Inhibition submitted to the Graduate School of the University of Wisconsin-Madison Jp'part.i~l f~lfillment of ~~ereq~ire~~nt$ for the degree of Doctor·of Philosophy by June M. Messmore Degree to be awarded: December 19_ May 19_ August 19~ th May 28 , 1999 Date of Examination . ~ r:i~ b lli{\~~ Dean. Graduate School 1 Ribonuclease A: Exploring the Function of an Active-Site Lysine in Catalysis and Inhibition June M. Messmore Under the supervision of Professor Ronald T. Raines at the University of Wisconsin-Madison ABSTRACT Structural analyses had suggested that the active-site lysine residue of RNase A (Lys41) may interact preferentially with the transition state for covalent bond cleavage, thus facilitating catalysis. Site-directed mutagenesis and chemical modification were combined (1) to probe the role of Lys41 in catalysis, (2) to provide a chemical on/off switch for RNase A activity in in vitro applications, and (3) to probe the analogy ofuridine 2',3'-cyclic vanadate to the catalytic transition state. In addition to studying inhibition by the uridine vanadate, inhibition by a polyvanadate species was also characterized. Results indicate the importance of positive charge and the donation of a single hydrogen bond in catalysis. Chemical modification can reversibly modulate the activity of ribonuclease by a factor of 30,000. -
Hypoxic Regulation of the 6-Phosphofructo-2-Kinase/Fructose
FEBS Letters 554 (2003) 264^270 FEBS 27797 CORE Metadata, citation and similar papers at core.ac.uk Provided by Elsevier -Hypoxic Publisher Connector regulation of the 6-phosphofructo-2-kinase/fructose-2,6- bisphosphatase gene family (PFKFB-1^4) expression in vivo Oleksandr Minchenkoa;b, Iryna Opentanovaa, Jaime Carob;Ã aDepartment of Molecular Biology, Institute of Biochemistry, National Academy of Science of Ukraine, Kyiv 01601, Ukraine bCardeza Foundation for Hematologic Research, Department of Medicine, Je¡erson Medical College of Thomas Je¡erson University, Curtis Bldg. 810, 1015 Walnut Street, Philadelphia, PA 19107, USA Received 12 May 2003; revised 10 September 2003; accepted 6 October 2003 First published online 21October 2003 Edited by Vladimir Skulachev 1. Introduction Abstract When oxygen becomes limiting, cells shift primarily to a glycolytic mode for generation of energy. A key regulator of glycolytic £ux is fructose-2,6-bisphosphate (F-2,6-BP), a po- The ability to respond to hypoxia is an essential evolution- tent allosteric regulator of 6-phosphofructo-1-kinase (PFK-1). ary adaptation in higher vertebrates. Hypoxia could be caused The levels of F-2,6-BP are maintained by a family of bifunc- by a generalized reduction in oxygen delivery, such as in alti- tional enzymes, 6-phosphofructo-2-kinase/fructose-2,6-bisphos- tude and pulmonary diseases, or by disruption in the local phatase (PFKFBor PFK-2), which have both kinase and phos- blood supply, such as in ischemic disorders. Important in phatase activities. Each member of the enzyme family is the adaptations to hypoxia is the activation of genes that characterized by their phosphatase:kinase activity ratio (K:B) ameliorate or compensate for the oxygen de¢cit. -
A New Rnase Sheds Light on the Rnase/Angiogenin Subfamily from Zebrafish
A new RNase sheds light on the RNase/angiogenin subfamily from zebrafish Pizzo Elio, Antonello Merlino, Mimmo Turano, Irene Russo Krauss, Francesca Coscia, Anna Zanfardino, Mario Varcamonti, Adriana Furia, Concetta Giancola, Lelio Mazzarella, et al. To cite this version: Pizzo Elio, Antonello Merlino, Mimmo Turano, Irene Russo Krauss, Francesca Coscia, et al.. A new RNase sheds light on the RNase/angiogenin subfamily from zebrafish. Biochemical Journal, Portland Press, 2010, 433 (2), pp.345-355. 10.1042/BJ20100892. hal-00549894 HAL Id: hal-00549894 https://hal.archives-ouvertes.fr/hal-00549894 Submitted on 23 Dec 2010 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Biochemical Journal Immediate Publication. Published on 04 Nov 2010 as manuscript BJ20100892 TITLE: A new RNase sheds light on the RNase/angiogenin subfamily from zebrafish Authors: Elio PIZZO*, Antonello Merlino†,‡, Mimmo Turano*, Irene Russo Krauss†, Francesca Coscia†, Anna Zanfardino*, Mario Varcamonti*, Adriana Furia*, Concetta Giancola†, Lelio Mazzarella†, ‡, Filomena Sica†, ‡, Giuseppe -
Development and Validation of a Protein-Based Risk Score for Cardiovascular Outcomes Among Patients with Stable Coronary Heart Disease
Supplementary Online Content Ganz P, Heidecker B, Hveem K, et al. Development and validation of a protein-based risk score for cardiovascular outcomes among patients with stable coronary heart disease. JAMA. doi: 10.1001/jama.2016.5951 eTable 1. List of 1130 Proteins Measured by Somalogic’s Modified Aptamer-Based Proteomic Assay eTable 2. Coefficients for Weibull Recalibration Model Applied to 9-Protein Model eFigure 1. Median Protein Levels in Derivation and Validation Cohort eTable 3. Coefficients for the Recalibration Model Applied to Refit Framingham eFigure 2. Calibration Plots for the Refit Framingham Model eTable 4. List of 200 Proteins Associated With the Risk of MI, Stroke, Heart Failure, and Death eFigure 3. Hazard Ratios of Lasso Selected Proteins for Primary End Point of MI, Stroke, Heart Failure, and Death eFigure 4. 9-Protein Prognostic Model Hazard Ratios Adjusted for Framingham Variables eFigure 5. 9-Protein Risk Scores by Event Type This supplementary material has been provided by the authors to give readers additional information about their work. Downloaded From: https://jamanetwork.com/ on 10/02/2021 Supplemental Material Table of Contents 1 Study Design and Data Processing ......................................................................................................... 3 2 Table of 1130 Proteins Measured .......................................................................................................... 4 3 Variable Selection and Statistical Modeling ........................................................................................