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https://www.readbyqxmd.com/read/28731303/lead-ii-binding-in-natural-and-artificial-proteins
#1
Virginia Cangelosi, Leela Ruckthong, Vincent L Pecoraro
This article describes recent attempts to understand the biological chemistry of lead using a synthetic biology approach. Lead binds to a variety of different biomolecules ranging from enzymes to regulatory and signaling proteins to bone matrix. We have focused on the interactions of this element in thiolate-rich sites that are found in metalloregulatory proteins such as Pbr, Znt, and CadC and in enzymes such as δ-aminolevulinic acid dehydratase (ALAD). In these proteins, Pb(II) is often found as a homoleptic and hemidirectic Pb(II)(SR)3- complex...
April 10, 2017: Metal Ions in Life Sciences
https://www.readbyqxmd.com/read/28646149/crucial-role-of-4-deoxy-l-erythro-5-hexoseulose-uronate-reductase-for-alginate-utilization-revealed-by-adaptive-evolution-in-engineered-saccharomyces-cerevisiae
#2
Fumiya Matsuoka, Makoto Hirayama, Takayuki Kashihara, Hideki Tanaka, Wataru Hashimoto, Kousaku Murata, Shigeyuki Kawai
In brown macroalgae, alginate and D-mannitol are promising carbohydrates for biorefinery. Saccharomyces cerevisiae is widely used as a microbial cell factory, but this budding yeast is unable to utilize either alginate or D-mannitol. Alginate can be depolymerized by both endo-type and exo-type alginate lyases, yielding a monouronate, 4-deoxy-L-erythro-5-hexoseulose uronate (DEH), a key intermediate in the metabolism of alginate. Here, we constructed engineered two S. cerevisiae strains that are able to utilize both DEH and D-mannitol on two different strain backgrounds, and we also improved their aerobic growth in a DEH liquid medium through adaptive evolution...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28623232/the-ring-finger-and-pdz-domain-containing-protein-pdzrn3-controls-localization-of-the-mg-2-regulator-claudin-16-in-renal-tube-epithelial-cells
#3
Kana Marunaka, Chisa Furukawa, Naoko Fujii, Toru Kimura, Takumi Furuta, Toshiyuki Matsunaga, Satoshi Endo, Hajime Hasegawa, Naohiko Anzai, Yasuhiro Yamazaki, Masahiko Yamaguchi, Akira Ikari
Ion exchange in the renal tubules is fundamental to the maintenance of physiological ion levels. Claudin-16 (CLDN16) regulates the paracellular reabsorption of Mg(2+) in the thick ascending limb of Henle's loop in the kidney, with dephosphorylation of CLDN16 increasing its intracellular distribution and decreasing paracellular Mg(2+) permeability. CLDN16 is located in the tight junctions, but the mechanism regulating its localization is unclear. Using yeast two-hybrid systems, we found that CLDN16 binds to PDZRN3, a protein containing both RING-finger and PDZ-domains...
June 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28588473/a-human-robot-interaction-perspective-on-assistive-and-rehabilitation-robotics
#4
Philipp Beckerle, Gionata Salvietti, Ramazan Unal, Domenico Prattichizzo, Simone Rossi, Claudio Castellini, Sandra Hirche, Satoshi Endo, Heni Ben Amor, Matei Ciocarlie, Fulvio Mastrogiovanni, Brenna D Argall, Matteo Bianchi
Assistive and rehabilitation devices are a promising and challenging field of recent robotics research. Motivated by societal needs such as aging populations, such devices can support motor functionality and subject training. The design, control, sensing, and assessment of the devices become more sophisticated due to a human in the loop. This paper gives a human-robot interaction perspective on current issues and opportunities in the field. On the topic of control and machine learning, approaches that support but do not distract subjects are reviewed...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28455329/rational-engineering-of-a-cold-adapted-%C3%AE-amylase-from-the-antarctic-ciliate-euplotes-focardii-for-simultaneous-improvement-of-thermostability-and-catalytic-activity
#5
Guang Yang, Hua Yao, Matteo Mozzicafreddo, Patrizia Ballarini, Sandra Pucciarelli, Cristina Miceli
The α-amylases are endo-acting enzymes that hydrolyze starch by randomly cleaving the 1,4-α-d-glucosidic linkages between the adjacent glucose units in a linear amylose chain. They have significant advantages in a wide range of applications, particularly in the food industry. The eukaryotic α-amylase isolated from the Antarctic ciliated protozoon Euplotes focardii (EfAmy) is an alkaline enzyme, different from most of the α-amylases characterized so far. Furthermore, EfAmy has the characteristics of a psychrophilic α-amylase, such as the highest hydrolytic activity at a low temperature and high thermolability, which is the major drawback of cold-active enzymes in industrial applications...
July 1, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28435130/intramyometrial-injection-of-vasopressin-a-novel-method-for-hemostasis-at-laparoscopic-management-of-cornual-ectopic
#6
Ramesh Bettaiah, Shwetha Sudhakar Kamath
STUDY OBJECTIVE: Injection of vasopressin into the uterus , significantly reduces the vascularity of the cornual ectopic, thereby resulting in bloodless surgery. DESIGN: A step by step demonstration of the surgical procedure. Canadian task force classification III SETTING: while all ectopics are associated with risk of hemorrhage, cornual pregnancies are feared for catastrophic hemorrhage and uncontrollable bleeding. The maternal mortality rate can be as high as 2...
April 18, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28374258/a-novel-grasp-and-loop-closure-method-for-defect-closure-after-endoscopic-full-thickness-resection-with-video
#7
Jian-Wei Hu, Lei Ge, Ping-Hong Zhou, Quan-Lin Li, Yi-Qun Zhang, Wei-Feng Chen, Tao Chen, Li-Qing Yao, Mei-Dong Xu, Yuan Chu
BACKGROUND: Endoscopic full-thickness resection (EFTR) is a minimally invasive method for en bloc resection of gastrointestinal (GI) lesions originating from the muscularis propria layer. Successful closure of the wall defect is a critical step. OBJECTIVE: The aim of this study was to evaluate the feasibility and efficacy of a novel and simplified endoscopic grasp-and-loop (GAL) closure method using an endo-loop assisted with grasping forceps for defect closure...
April 3, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28236179/post-operative-outcomes-and-complications-of-suspensory-loop-fixation-device-versus-hook-plate-in-acute-unstable-acromioclavicular-joint-dislocation-a-systematic-review-and-meta-analysis
#8
REVIEW
Alisara Arirachakaran, Manusak Boonard, Peerapong Piyapittayanun, Wichan Kanchanatawan, Kornkit Chaijenkij, Akom Prommahachai, Jatupon Kongtharvonskul
BACKGROUND: Treatment of acute (≤3 weeks) acromioclavicular joint dislocation type III-VI is still controversial. Currently, the two modern techniques that are widely used are hook plate (HP) fixation and coracoclavicular ligament fixation using a suspensory loop device that consists of either a tightrope (single or double), endo-button (single or double), or synthetic ligament and absorbable polydioxansulfate sling. MATERIALS AND METHODS: This systematic review was conducted according to the PRISMA guidelines...
February 25, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28163025/structural-basis-for-the-transglycosylase-activity-of-a-gh57-type-glycogen-branching-enzyme-from-pyrococcus-horikoshii
#9
Soohui Na, Minjeong Park, Inseong Jo, Jaeho Cha, Nam-Chul Ha
Glycogen branching enzyme (GBE) catalyzes the formation of α-1,6-branching points during glycogenesis by cleaving α-1,4 bonds and making new α-1,6 bonds. Most GBEs belong to the glycoside hydrolase 13 family (GH13), but new GBEs in the GH57 family have been isolated from Archaea. Here, we determined the crystal structure of a GH57 GBE from the hyperthermophilic archaeon Pyrococcus horikoshii (PhGBE) at a resolution of 2.3 Å. PhGBE exhibits both α-1,6-branching activity and endo-α-1,4 hydrolytic activity...
March 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28072899/endoluminal-vacuum-therapy-as-treatment-for-anastomotic-colorectal-leakage
#10
Giovanni Milito, Giorgio Lisi, Dario Venditti, Michela Campanelli, Elena Aronadio, Simona Grande, Francesca Cabry, Michele Grande
BACKGROUND: The clinical leakage rate after anterior resection varies from 2.8-20%, with a 6-22% mortality rate and a 10-80% risk of permanent stoma. Endo-SPONGE® (B. Braun Melsungen AG, Melsungen, Germany) may treat extraperitoneal anastomotic leakage in the lesser pelvis. It consists of an open-pored sponge inserted into the cavity. A drainage tube fixed to a low vacuum drainage system is then connected to the sponge through the anus. MATERIAL AND METHODS: Between January 2007 and December 2014, 14 patients with anastomotic leakage following low anterior resection were treated with Endo-SPONGE® and were prospectively evaluated...
January 10, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/28013455/laparoscopic-appendectomy-hem-o-lok-versus-endoloop-in-stump-closure
#11
Andrea Lucchi, Pierluigi Berti, Michele Grassia, Luca Maria Siani, Carlo Gabbianelli, Gianluca Garulli
There are several techniques described to close the appendicular stump during laparoscopic appendectomy. The aim of this study was to investigate the safety and usefulness of the Hem-o-lok clip for the closure of appendicular stump, comparing these data with those concerning the endo-loop. We conducted a retrospective study that compared two groups of patients who underwent laparoscopic appendectomy from 2010 to 2015 at our institution. We used the Endoloop to close the stump in the first group (group I) and the Hem-o-lok in the second group (group II)...
December 24, 2016: Updates in Surgery
https://www.readbyqxmd.com/read/27929074/probing-the-role-of-cation-%C3%AF-interaction-in-the-thermotolerance-and-catalytic-performance-of-endo-polygalacturonases
#12
Tao Tu, Yeqing Li, Xiaoyun Su, Kun Meng, Rui Ma, Yuan Wang, Bin Yao, Zhemin Lin, Huiying Luo
Understanding the dynamics of the key pectinase, polygalacturonase, and improving its thermotolerance and catalytic efficiency are of importance for the cost-competitive bioconversion of pectic materials. By combining structure analysis and molecular dynamics (MD) simulations, eight mutagenesis sites having the potential to form cation-π interactions were identified in the widely used fungal endo-polygalacturonase PG63. In comparison to the wild-type, three single mutants H58Y, T71Y and T304Y showed improved thermostability (the apparent Tms increased by 0...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27907169/crystal-structure-of-chitinase-chiw-from-paenibacillus-sp-str-fpu-7-reveals-a-novel-type-of-bacterial-cell-surface-expressed-multi-modular-enzyme-machinery
#13
Takafumi Itoh, Takao Hibi, Fumiko Suzuki, Ikumi Sugimoto, Akihiro Fujiwara, Koji Inaka, Hiroaki Tanaka, Kazunori Ohta, Yutaka Fujii, Akira Taketo, Hisashi Kimoto
The Gram-positive bacterium Paenibacillus sp. str. FPU-7 effectively hydrolyzes chitin by using a number of chitinases. A unique chitinase with two catalytic domains, ChiW, is expressed on the cell surface of this bacterium and has high activity towards various chitins, even crystalline chitin. Here, the crystal structure of ChiW at 2.1 Å resolution is presented and describes how the enzyme degrades chitin on the bacterial cell surface. The crystal structure revealed a unique multi-modular architecture composed of six domains to function efficiently on the cell surface: a right-handed β-helix domain (carbohydrate-binding module family 54, CBM-54), a Gly-Ser-rich loop, 1st immunoglobulin-like (Ig-like) fold domain, 1st β/α-barrel catalytic domain (glycoside hydrolase family 18, GH-18), 2nd Ig-like fold domain and 2nd β/α-barrel catalytic domain (GH-18)...
2016: PloS One
https://www.readbyqxmd.com/read/27888075/the-domain-ii-loops-of-bacillus-thuringiensis-cry1aa-form-an-overlapping-interaction-site-for-two-bombyx-mori-larvae-functional-receptors-abc-transporter-c2-and-cadherin-like-receptor
#14
Satomi Adegawa, Yui Nakama, Haruka Endo, Naoki Shinkawa, Shingo Kikuta, Ryoichi Sato
Information about the receptor-interaction region of Cry toxins, insecticidal proteins produced by Bacillus thuringiensis, is needed to elucidate the mode of action of Cry toxins and improve their toxicity through protein engineering. We analyzed the interaction sites on Cry1Aa with ABC transporter C2 (ABCC2), one of the most important Cry1A toxin receptors. A competitive binding assay revealed that the Bombyx mori ABCC2 (BmABCC2) Cry1A binding site was the same as the BtR175 binding site, suggesting that the loop region of Cry1Aa domain II is a binding site...
February 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27872187/galactomannan-catabolism-conferred-by-a-polysaccharide-utilization-locus-of-bacteroides-ovatus-enzyme-synergy-and-crystal-structure-of-a-%C3%AE-mannanase
#15
Viktoria Bågenholm, Sumitha K Reddy, Hanene Bouraoui, Johan Morrill, Evelina Kulcinskaja, Constance M Bahr, Oskar Aurelius, Theresa Rogers, Yao Xiao, Derek T Logan, Eric C Martens, Nicole M Koropatkin, Henrik Stålbrand
A recently identified polysaccharide utilization locus (PUL) from Bacteroides ovatus ATCC 8483 is transcriptionally up-regulated during growth on galacto- and glucomannans. It encodes two glycoside hydrolase family 26 (GH26) β-mannanases, BoMan26A and BoMan26B, and a GH36 α-galactosidase, BoGal36A. The PUL also includes two glycan-binding proteins, confirmed by β-mannan affinity electrophoresis. When this PUL was deleted, B. ovatus was no longer able to grow on locust bean galactomannan. BoMan26A primarily formed mannobiose from mannan polysaccharides...
January 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27671679/zic5-drives-melanoma-aggressiveness-by-pdgfd-mediated-activation-of-fak-and-stat3
#16
Reiko Satow, Tomomi Nakamura, Chiaki Kato, Miku Endo, Mana Tamura, Ryosuke Batori, Shiori Tomura, Yumi Murayama, Kiyoko Fukami
Insights into mechanisms of drug resistance could extend the efficacy of cancer therapy. To probe mechanisms in melanoma, we performed siRNA screening of genes that mediate the development of neural crest cells, from which melanocytes are derived. Here, we report the identification of ZIC5 as a mediator of melanoma drug resistance. ZIC5 is a transcriptional suppressor of E-cadherin expressed highly in human melanoma. ZIC5 enhanced melanoma cell proliferation, survival, drug resistance, in vivo growth and metastasis...
January 15, 2017: Cancer Research
https://www.readbyqxmd.com/read/27626482/a-vicious-cycle-between-acid-sensing-and-survival-signaling-in-myeloma-cells-acid-induced-epigenetic-alteration
#17
Ryota Amachi, Masahiro Hiasa, Jumpei Teramachi, Takeshi Harada, Asuka Oda, Shingen Nakamura, Derek Hanson, Keiichiro Watanabe, Shiro Fujii, Hirokazu Miki, Kumiko Kagawa, Masami Iwasa, Itsuro Endo, Takeshi Kondo, Sumiko Yoshida, Ken-Ichi Aihara, Kiyoe Kurahashi, Yoshiaki Kuroda, Hideaki Horikawa, Eiji Tanaka, Toshio Matsumoto, Masahiro Abe
Myeloma (MM) cells and osteoclasts are mutually interacted to enhance MM growth while creating acidic bone lesions. Here, we explored acid sensing of MM cells and its role in MM cell response to acidic conditions. Acidic conditions activated the PI3K-Akt signaling in MM cells while upregulating the pH sensor transient receptor potential cation channel subfamily V member 1 (TRPV1) in a manner inhibitable by PI3K inhibition. The acid-activated PI3K-Akt signaling facilitated the nuclear localization of the transcription factor Sp1 to trigger the expression of its target genes, including TRPV1 and HDAC1...
October 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/27616748/siah-1-is-associated-with-expression-of-hypoxia-inducible-factor-1%C3%AE-in-oral-squamous-cell-carcinoma
#18
Mitsuharu Aga, Satoru Kondo, Naohiro Wakisaka, Makiko Moriyama-Kita, Kazuhira Endo, Yosuke Nakanishi, Shigeyuki Murono, Hisashi Sugimoto, Takayoshi Ueno, Tomokazu Yoshizaki
OBJECTIVE: Hypoxia-inducible factor-1 (HIF-1) is a heterodimeric basic helix-loop-helix transcription factor composed of the HIF-1α and HIF-1β subunits. HIF-1 is a central regulator of responses to hypoxia; it enhances metastasis-related factors such as matrix metalloproteinases and vascular endothelial growth factor (VEGF). We have reported critical roles for HIF-1α in tumor microenvironments, and oncogenic properties of HIF-1α have been suggested in malignancies. Seven in absentia homologue (Siah) appeared to upregulate HIF-1 production, which prompted us to investigate the Siah association with HIF-1α expression in oral squamous cell carcinoma (OSCC)...
April 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/27349986/from-dioxin-toxicity-to-putative-physiologic-functions-of-the-human-ah-receptor-in-homeostasis-of-stem-progenitor-cells
#19
REVIEW
Karl Walter Bock
Despite decades of intensive research physiologic Ah receptor (AHR) functions are not yet elucidated. Challenges include marked species differences and dependence of AHR function on the cell type and cellular context. Hints to physiologic functions may be derived (i) from feedback loops between endogenous ligands and substrates of major target enzymes such as CYP1A1 and UGT1A1, and (ii) from dioxin toxicity in human individuals. For example, dioxin-mediated chloracne is probably due to dysregulated homeostasis of sebocyte stem/progenitor cells...
January 1, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/27320797/hepatic-cytochromes-p450-structural-degrons-and-barcodes-posttranslational-modifications-and-cellular-adapters-in-the-erad-endgame
#20
Sung-Mi Kim, YongQiang Wang, Noushin Nabavi, Yi Liu, Maria Almira Correia
The endoplasmic reticulum (ER)-anchored hepatic cytochromes P450 (P450s) are enzymes that metabolize endo- and xenobiotics i.e. drugs, carcinogens, toxins, natural and chemical products. These agents modulate liver P450 content through increased synthesis or reduction via inactivation and/or proteolytic degradation, resulting in clinically significant drug-drug interactions. P450 proteolytic degradation occurs via ER-associated degradation (ERAD) involving either of two distinct routes: Ubiquitin (Ub)-dependent 26S proteasomal degradation (ERAD/UPD) or autophagic lysosomal degradation (ERAD/ALD)...
August 2016: Drug Metabolism Reviews
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