Abstract：
:Antigen 43 (Ag43) is a prominent hetero-oligomeric protein complex in the outer membrane of Escherichia coli. It is composed of two subunits. alpha 43 (M(r) 60, 000) and beta 43 (M(r) 53, 000) in 1:1 stoichiometry. alpha 43 is surface expressed, extends beyond the O-side chains of smooth lipopolysaccharide and is bound to the cell surface through an interaction with beta 43, itself an integral outer membrane protein, alpha 43 shows limited sequence homology with some enterobacterial adhesins. Expression of Ag43 is subject to reversible phase variation, the rates of variation from the Ag43+ve to Ag43-ve states in liquid minimal medium being approximately 2.2 x 10(-3), the corresponding rates from Ag43-ve to Ag43+ve states being approximately 1 x 10(-3). Phase switching of genes encoding Ag43 are transcriptionally regulated by DNA methylation (deoxyadenosine methylase [dam] mutants being "locked OFF") and by OxyR (oxyR mutants being "locked ON"). It is proposed that OxyR acts as a repressor of Ag43 transcription by binding to unmethylated GATC sites in the regulatory region of the gene. Sequencing and mapping has identified Ag43 as the likely product of the metastable flu gene first described in 1980 by Diderichsen and responsible for colony form variation in E. coli.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Henderson IR,Meehan M,Owen Pdoi
10.1007/978-1-4899-1828-4_56subject
Has Abstractpub_date
1997-01-01 00:00:00pages
349-55eissn
0065-2598issn
2214-8019journal_volume
412pub_type
杂志文章abstract：:STAT (signal transducers and activators of transcription) are latent cytoplasmic transcription factors that function as downstream effectors of cytokine and growth factor receptor signaling. The canonical JAK/STAT signaling pathway involves the activation of Janus kinases (JAK) or growth factors receptor kinases, phos...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-94-007-4719-7_10
更新日期：2013-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：2015-01-01 00:00:00
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doi：10.1007/978-981-13-8719-7_14
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pub_type： 杂志文章,评审
doi：10.1007/978-1-4614-4015-4_9
更新日期：2013-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：2019-01-01 00:00:00
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更新日期：2017-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/5584_2016_12
更新日期：2016-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4899-0274-0_15
更新日期：1996-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-981-10-6583-5_12
更新日期：2017-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4684-3369-2_58
更新日期：1978-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4614-3209-8_87
更新日期：2014-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4615-4729-7_10
更新日期：1999-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4684-7974-4_13
更新日期：1985-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4684-5769-8_47
更新日期：1990-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-0-387-75681-3_20
更新日期：2009-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4899-1379-1_10
更新日期：1996-01-01 00:00:00
abstract：:Complementary and alternative medicine (CAM) encompasses a wide range of different nonmainstream therapies that have been increasingly used for treatment or adjunctive treatment of various ailments with anxiety/anxiety disorders being one of the commonly CAM (self)-medicated conditions. Thousands of published papers r...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-981-32-9705-0_22
更新日期：2020-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-981-32-9705-0_12
更新日期：2020-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4419-5913-3_1
更新日期：2010-01-01 00:00:00
abstract：:Oxygen plays a key role in tumor therapy and may be related to tumor development: e.g., angiogenesis and metastasis. Using noninvasive techniques to accurately measure tumor oxygenation could assist in developing novel therapies. Here, we have used the FREDOM (Fluorocarbon Relaxometry using Echo planar imaging for Dyn...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4615-0075-9_22
更新日期：2003-01-01 00:00:00
abstract：:The purpose of this study was to investigate the effects of acute hypoxia on the inflection point of muscle oxygenation (IPMO) using near-infrared spectroscopy during incremental bicycle exercise. Eight male subjects (age: 22 +/- 2 years) performed two ramp incremental bicycle exercise tests until exhaustion under eac...
journal_title：Advances in experimental medicine and biology
pub_type： 临床试验,杂志文章
doi：10.1007/978-1-4419-1241-1_56
更新日期：2010-01-01 00:00:00
abstract：:Before the advent of ubiquitin immunochemistry and immunogold electron microscopy, there was no known intracellular molecular commonality between neurodegenerative diseases. The application of antibodies which primarily detect ubiquitin protein conjugates has shown that all of the human and animal idiopathic and trans...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4613-0335-0_33
更新日期：1996-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4419-0298-6_4
更新日期：2009-01-01 00:00:00
abstract：:The renal alterations induced by alkali-treated protein and lysinoalanine are reviewed and their biological implications discussed. Alkali-treated proteins and lysinoalanine, an unusual amino acid formed in proteins during alkali treatment, have been shown to produce a renal alteration characterized by nuclear and cyt...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4757-9113-6_2
更新日期：1977-01-01 00:00:00
abstract：:IFN-gamma is the most effective principle responsible for IDO induction in human cells in vitro. Lymphocyte factors support the effect of other IFN species. Induction of IDO and influence of various factors on IDO is correlated to pteridine synthesis. Cooperative effects of several mediators may account for in vivo ob...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4684-5952-4_55
更新日期：1991-01-01 00:00:00
abstract：:Substantial evidence has surfaced on the hormone-like effects of many xenobiotics in fish, wildlife and humans (Colborn et al., 1993). The endocrine and reproductive effects of xenobiotics are believed to be due to their 1) mimicking the effects of endogenous hormones such as estrogens and androgens, 2) antagonizing t...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4899-0089-0_3
更新日期：1998-01-01 00:00:00
abstract：:Following the Golden Age of antibiotic discovery in the previous century, the rate of antibiotic discovery has plummeted during the past 50 years while the incidence of antimicrobial resistance is ever-increasing. Presently, humankind is forced to address a major public health threat in the form of multiple drug resis...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-981-10-7572-8_5
更新日期：2018-01-01 00:00:00
abstract：:The transient length response of the cat papillary muscle in Ba2+-contracture to step tension reduction was found to comprise four different phases. It is tentatively suggested that the transient response is mostly determined by the kinetics of the attachment and detachment of cross-bridges between actin and myosin fi...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4684-4703-3_82
更新日期：1984-01-01 00:00:00
abstract：:The effect of r-TNF on T. musculi is complex. When trypanosomes are incubated in culture with this monokine, TNF exerts a direct anti-trypanosomal effect (Table 3). Similarly, if mice are treated with TNF during the later stages of infection, after the parasitaemia has stabilized, it hastens the elimination of the try...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4757-5421-6_26
更新日期：1988-01-01 00:00:00
