Abstract:
:Transpeptidation reactions result in the formation of new peptide bonds and this can occur between two separate peptides or within the one peptide. These reactions are catalyzed by enzymes and when the N- and C-terminus of the one peptide are joined it results in the formation of cyclic proteins. Cyclization via head-to-tail linkage of the termini of a peptide chain occurs in only a small percentage of proteins but gives the resultant cyclic proteins exceptional stability. The mechanisms are not well understood and this review documents what is known of the events that lead to cyclization. Gene encoded cyclic proteins are found in both prokaryotic and eukaryotic species. The prokaryotic circular proteins include the bacteriocins and pilins. The eukaryotic circular proteins in mammals include the θ-defensins and retrocyclins. Small cyclic proteins are also found in fungi and a large range of cyclic proteins are expressed in cyanobacteria. Three types of cyclic proteins have been found in plants, the small cyclic proteins of 5-12 amino acids, the cyclic proteins from sunflower which are made up of 12-14 amino acids, and the larger group known as cyclotides which contain 28-37 amino acids. Three classes of enzymes are able to catalyse transpeptidation reactions, these include the cysteine, serine and threonine proteases. However only cysteine and serine proteases have been documented to cyclize proteins. The cyclotides from Oldenlandia affinis, the plant in which cyclotides were first discovered, are processed by an asparaginyl endopeptidase which is a cysteine protease. These proteases cleave an amide bond and form an acyl enzyme intermediate before nucleophilic attack of the amine group of the N-terminal residue to form a peptide bond, resulting in a cyclic peptide.
journal_name
Curr Pharm Desjournal_title
Current pharmaceutical designauthors
Conlan BF,Anderson MAdoi
10.2174/138161211798999410subject
Has Abstractpub_date
2011-12-01 00:00:00pages
4318-28issue
38eissn
1381-6128issn
1873-4286pii
BSP/CPD/E-PUB/ 000790journal_volume
17pub_type
杂志文章,评审abstract:BACKGROUND AND OBJECTIVES:The 3' repair exonuclease 1 (TREX1) gene is the major DNA-specific 3'-5 'exonuclease of mammalian cells which reduces single- and double-stranded DNA (ssDNA and dsDNA) to prevent undue immune activation mediated by the nucleic acid. TREX1 is also a crucial suppressor of selfrecognition that pr...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612825666190902113218
更新日期:2019-01-01 00:00:00
abstract::The concept that the gut microbiota plays a major role in the development of pouchitis in ulcerative colitis patients after restorative proctocolectomy with ileal pouch-anal anastomosis, is widely accepted and supported by a widespread use of some antibiotics (metronidazole and/or ciprofloxacin, rifaximin) to treat th...
journal_title:Current pharmaceutical design
pub_type: 杂志文章
doi:10.2174/13816128113196660724
更新日期:2014-01-01 00:00:00
abstract::Chronic pain is a widespread healthcare problem affecting not only the patient but in many ways all the society. Chronic pain is a disease itself that endures for a long period of time and it is resistant to the majority of medical treatments that provide modest improvements in pain and minimum improvements in physica...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612820666140314150634
更新日期:2014-01-01 00:00:00
abstract:Background:Capsinoids (CSN), the novel non-pungent capsaicin analogs have been reported to promote metabolic health and exercise tolerance. However, the effect of CSN on fat oxidation and changes in skeletal muscle glycogen levels during post-exercise recovery has not been investigated in humans. Purpose:We examined t...
journal_title:Current pharmaceutical design
pub_type: 杂志文章
doi:10.2174/1381612826666200824104856
更新日期:2020-08-23 00:00:00
abstract::G protein receptor kinase 2 (GRK2) has been for years mainly considered the negative regulator of the cardiac β adrenergic signaling. However GRK2 is a ubiquitous molecule and its kinase activity and scaffold properties brought to several investigations which have evidenced its involvement in pathophysiology of extra-...
journal_title:Current pharmaceutical design
pub_type: 杂志文章
doi:10.2174/138161212799040493
更新日期:2012-01-01 00:00:00
abstract::A large body of evidence has accumulated indicating involvement of oxidative stress (OS) in the mode of action of various bioactive substances, including those of the immune system. The data for anticancer drugs (main and miscellaneous) are summarized herein. Although diverse origins pertain, reactive oxygen species (...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612003401046
更新日期:2000-02-01 00:00:00
abstract::Angiogenic eye disease is among the most common causes of blindness worldwide. Current treatment approaches are insufficiently effective and partially associated with significant adverse effects. From an investigational view, the eye provides an ideal setting to observe real-time and serial observations of angiogenesi...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612054367292
更新日期:2005-01-01 00:00:00
abstract::The large conduit arteries of the thorax and abdomen are elastic while those in the arms and legs are muscular. Alterations in wall properties of elastic arteries occur over time and are usually permanent in nature; acute changes can, however, occur is response to a change in transmural pressure. Chronic alterations i...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161209787354258
更新日期:2009-01-01 00:00:00
abstract::Osteoblasts pass through a sequence of events controlled by hormones and transcriptional factors ensuring proper development of phenotype and functional properties until the osteoblast enter the osteocyte phenotype and/or undergo apoptosis. During its life cycle, the osteoblasts proliferate, deposit matrix proteins an...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612013398167
更新日期:2001-03-01 00:00:00
abstract::Heme oxygenase-1 (HO-1) catalyzes the degradation of heme to generate carbon monoxide, biliverdin and free iron. Increased HO-1 levels constitute an anatomopathological feature of many neurological diseases, such as neurodegenerative disorders and brain infections, which correlate with exacerbated oxidative stress and...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161208783597407
更新日期:2008-01-01 00:00:00
abstract::This review is based on carriers of natural origin such as polysaccharides, proteins, and cell derived entities which have been used for delivery of siRNA. To realize the therapeutic potential of a delivery system, the role of the carrier is of utmost importance. Historical aspects of viral vectors, the first carriers...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161282131151013185528
更新日期:2015-01-01 00:00:00
abstract::Unhealthy diet and alcohol are serious health problems, especially in adolescents and young adults. "Binge" is defined as the excessive and uncontrolled consumption of food (binge eating) and alcohol (binge drinking). Both behaviors are frequent among young people and have a highly negative impact on health and qualit...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612826666200316153317
更新日期:2020-01-01 00:00:00
abstract::Patients with diabetes mellitus (DM) type 2 have a high prevalence of coronary artery disease (CAD), as diabetes is implicated in the formation of atherosclerotic plaque. Hyperglycemia, elevated free fatty acid, increased amount of circulating end-glucosylated serum products and insulin resistance are the main mechani...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161209788453185
更新日期:2009-01-01 00:00:00
abstract::Synaptic plasticity is now known to occur at glutamate synapses throughout the brain, including the neocortex, and to play a role in neurodevelopment as well as in a broad spectrum of adult neural functions. Here the hypothesis that synaptic plasticity, specifically long term depression, is the neural substrate that m...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612819666140110122307
更新日期:2014-01-01 00:00:00
abstract::This study was designed to evaluate the distribution of Tregs/Th17/Th1 cells in type 2 diabetic patients with foot disease before and after human umbilical cord blood mesenchymal stem cell (hUCB-MSCs) transplantation. Fifteen diabetic patients with foot disease under insulin therapy received hUCB-MSC transplantation. ...
journal_title:Current pharmaceutical design
pub_type: 杂志文章
doi:10.2174/13816128113199990326
更新日期:2013-01-01 00:00:00
abstract::The need to identify and characterize vulnerable atherosclerotic lesions in humans has lead to the development of various animal models of plaque vulnerability. In this review, current concepts of the vulnerable plaque as it leads to an acute coronary event are described, such as plaque rupture, erosion, intraplaque h...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161207780487575
更新日期:2007-01-01 00:00:00
abstract::Non-enzymatic modification of proteins by reducing sugars, a process that is also known as Maillard reaction, leads to the formation of advanced glycation end products (AGEs) in vivo. There is a growing body of evidence that formation and accumulation of AGEs progress during normal aging, and at an extremely accelerat...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161208784139747
更新日期:2008-01-01 00:00:00
abstract::In recent years, Aβ aggregation prevention, one of the most concerned strategies in drug development has been carefully assessed to treat Alzheimer's disease. Aβ peptides can transform structurally from random coil monomer into β-stranded protofibril via multiple oligomeric states. Among the various Aβ species, the id...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612824666180813093420
更新日期:2018-01-01 00:00:00
abstract::A better knowledge of the mechanisms underlying hepatocellular carcinoma (HCC) growth and spread is essential to improve the available treatment options. So far, the only therapies available for HCC are mainly based on tumor-destructive approaches, whereas no therapies are available to consolidate these invasive thera...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161207782360645
更新日期:2007-01-01 00:00:00
abstract::Hyperglycemia is a common feature of the critically ill in general and of patients with sepsis in particular. Even a moderate degree of hyperglycemia appears detrimental for the outcome of critically ill patients, since maintenance of normoglycemia (blood glucose levels journal_title:Current pharmaceutical design pub_type: 杂志文章,评审 doi:10.2174/138161208784980563 更新日期:2008-01-01 00:00:00
abstract::Antimicrobial photodynamic therapy (aPDT) is an emerging alternative to antibiotics motivated by growing problems with multi-drug resistant pathogens. aPDT uses non-toxic dyes or photosensitizers (PS) in combination with harmless visible of the correct wavelength to be absorbed by the PS. The excited state PS can form...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161211795703735
更新日期:2011-01-01 00:00:00
abstract::Elevated levels of Low Density Lipoprotein cholesterol (LDL-C) are directly associated with increased risk for atherosclerotic cardiovascular and cerebrovascular events. Statins have been used to control serum LDLC and this has translated into reduction in cardiovascular and cerebrovascular events. However, despite hi...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612824666180111105201
更新日期:2018-01-01 00:00:00
abstract:BACKGROUND:In spite of considerable efforts of researchers the cancer deseases remain to be incurable and a percentage of cancer deseases in the structure of mortality increases every year. At that, high systemic toxicity of antitumor drugs hampers their effective use. Because of this fact, the development of nanosyste...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612825666190117095132
更新日期:2018-01-01 00:00:00
abstract::Atrial fibrillation (AF) is the most common sustained rhythm disturbance, increasing prevalence with age, in particular in patients with cardiovascular disease. On the other hand, a subset of patients with AF being <60 years old and no evidence of underlying cardiovascular disease, and laboratory tests including thyro...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612820666140825142206
更新日期:2015-01-01 00:00:00
abstract::Glioblastoma (GBM) is a deadly tumor, which in spite of surgery and radio/chemotherapy frequently undergoes relapses related to the infiltration of the normal parenchyma and to resistance to cytotoxic and radiation therapy. Immunotherapy may represent a promising approach, which may complement existing therapies with ...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161211797249206
更新日期:2011-01-01 00:00:00
abstract::Drug-drug interactions may occur when to combine two or more drugs and may cause some adverse events such as Cardiotoxicity, Central neurotoxicity, Hepatotoxicity, etc. Although a large number of researchers who are proficient in pharmacokinetics and pharmacodynamics have been engaged in drug assays and trying to find...
journal_title:Current pharmaceutical design
pub_type: 杂志文章
doi:10.2174/1381612827666210127122312
更新日期:2021-01-27 00:00:00
abstract::Cell therapy has been proposed to treat patients with end-stage heart failure. However, it has been suggested that the significant mechanical forces in an often ischaemic, inflamed, biochemically hostile environment may cause poor cell survival and retention. It is hypothesised that tissue engineering techniques could...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/13816128113199990442
更新日期:2014-01-01 00:00:00
abstract::More and more evidences are still accumulating rapidly on the G-protein-coupled-receptors (GPCRs) dimerization/oligomerization. Such common feature of GPCRs has called extensive attention to both pharmacologists and medicinal chemists for illustration of the pharmacological functions and therapeutic utilities of such ...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/138161209787315639
更新日期:2009-01-01 00:00:00
abstract::Over the last several years, it has become increasingly clear that dendritic cells (DC) are not only critical for the initiation of T cell immunity, but these cells also determine the course of the subsequent immune response (i.e. tolerance vs. immunity, Th1 vs. Th2). However, the mechanisms by which DC can influence ...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612013397627
更新日期:2001-07-01 00:00:00
abstract:BACKGROUND:The use of essential oils is receiving increasing attention worldwide, as these oils are good sources of several bioactive compounds. Nowadays essential oils are preferred over synthetic preservatives thanks to their antioxidant and antimicrobial properties. Several studies highlight the beneficial effect of...
journal_title:Current pharmaceutical design
pub_type: 杂志文章,评审
doi:10.2174/1381612826666200121092018
更新日期:2020-01-01 00:00:00