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1.
Pierre-Yves Jean-Charles Vishwaesh Rajiv Subhodeep Sarker Sangoh Han Yushi Bai Ali Masoudi Sudha K. Shenoy 《The Journal of biological chemistry》2022,298(5)
Arrestins and their yeast homologs, arrestin-related trafficking adaptors (ARTs), share a stretch of 29 amino acids called the ART motif. However, the functionality of that motif is unknown. We now report that deleting this motif prevents agonist-induced ubiquitination of β-arrestin2 (β-arr2) and blocks its association with activated G protein–coupled receptors (GPCRs). Within the ART motif, we have identified a conserved phenylalanine residue, Phe116, that is critical for the formation of β-arr2–GPCR complexes. β-arr2 Phe116Ala mutant has negligible effect on blunting β2-adrenergic receptor–induced cAMP generation unlike β-arr2, which promotes rapid desensitization. Furthermore, available structures for inactive and inositol hexakisphosphate 6–activated forms of bovine β-arr2 revealed that Phe116 is ensconced in a hydrophobic pocket, whereas the adjacent Phe117 and Phe118 residues are not. Mutagenesis of Phe117 and Phe118, but not Phe116, preserves GPCR interaction of β-arr2. Surprisingly, Phe116 is dispensable for the association of β-arr2 with its non-GPCR partners. β-arr2 Phe116Ala mutant presents a significantly reduced protein half-life compared with β-arr2 and undergoes constitutive Lys-48-linked polyubiquitination, which tags proteins for proteasomal degradation. We also found that Phe116 is critical for agonist-dependent β-arr2 ubiquitination with Lys-63-polyubiquitin linkages that are known mediators of protein scaffolding and signal transduction. Finally, we have shown that β-arr2 Phe116Ala interaction with activated β2-adrenergic receptor can be rescued with an in-frame fusion of ubiquitin. Taken together, we conclude that Phe116 preserves structural stability of β-arr2, regulates the formation of β-arr2–GPCR complexes that inhibit G protein signaling, and promotes subsequent ubiquitin-dependent β-arr2 localization and trafficking. 相似文献
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Length–weight relationships for four Aphanius species of Iran (Teleostei: Cyprinodontidae) 下载免费PDF全文
H. R. Esmaeili M. Masoudi G. Sayyadzadeh H. R. Mehraban Z. Gholami A. Teimori 《Zeitschrift fur angewandte Ichthyologie》2015,31(3):578-579
Length–weight parameters are presented for four endemic tooth‐carps of the genus Aphanius from Iran. 相似文献
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Intissar Ezzidi Nabil Mtiraoui Mohammed Eltigani Mohmmed Ali Aqeel Al Masoudi Faisel Abu Duhier 《Journal of genetics》2018,97(5):1213-1223
Polycystic ovary syndrome (PCOS) is a common endocrine disorder in females, and is associated with altered metabolic processes in particular insulin resistance and diabetes mellitus. PCOS shares with type-2 diabetes (T2D) a number of features, including beta cell dysfunction, impaired glucose tolerance and dyslipidaemia. Recently, genomewide association studies (GWAS) have reported a number of genes with reproducible associations and susceptibilities to T2D. To address this, we examined the association between the T2D GWAS candidate genes (CDKAL1, CDKN2B, COL8A1, HHEX, IGF2BP2, KCNJ1, KCNQ1 and SLC30A8) and PCOS in Saudi women. A case–control study, includes 162 cases and 162 controls was enrolled. Genotyping was carried out by the allelic discrimination method. Our results showed that the variants including rs792837 of COL8A1, rs61873498 of KCNQ1 and rs13266634 of SLC30A8 genes to be significantly more frequent in PCOS patients than in controls. Our results suggest that COL8A1, KCNQ1 and SLC30A8, which are previously identified through GWAS as T2D-associated genes, are associated with PCOS. 相似文献
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Sanjarani Vahed N. Esmaeili H. R. Masoudi M. Reichenbacher B. 《Journal of Ichthyology》2019,59(3):336-343
Journal of Ichthyology - Otolith morphology in the tooth-carp/killifish genus Aphanius is an important source of taxonomic information. However, little is known about the range of ontogenetic... 相似文献
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Plasmonics - In this paper, we will present a quantization method for surface plasmon polariton (SPP) based on Green’s tensor method, which is applied usually for quantization of EM field in... 相似文献
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Embryology and early ontogeny of an endemic tooth‐carp fish,Aphanius sophiae (Heckel, 1847) 下载免费PDF全文
Understanding embryonic development and ontogeny of species is a crucial part of any further biology, ecology and conservation studies. The present study describes the first detailed normal embryonic development of a tooth‐carp, Aphanius sophiae (Heckel, 1847), from fertilization to post‐ hatching. Aphanius sophiae spontaneously spawned at 24 ± 1°C. The newly laid eggs were transparent and spherical (1.45 ± 0.20 mm). We documented developmental times at 24 ± 1°C to egg activation (0.5 hr), cleavage (3 hr), blastula (10 hr), gastrula (20 hr), neurula (24 hr), somite (28 hr), turnover (60 hr), blood circulation (70 hr) and hatching (330 hr). This study contributes to a further understanding of the embryology and the early ontogeny of A. sophiae and may help improve the culture of other threatened species of the genus Aphanius. 相似文献
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Thomas E. Edwards Isabelle Phan Jan Abendroth Shellie H. Dieterich Amir Masoudi Wenjin Guo Stephen N. Hewitt Angela Kelley David Leibly Mitch J. Brittnacher Bart L. Staker Samuel I. Miller Wesley C. Van Voorhis Peter J. Myler Lance J. Stewart 《PloS one》2010,5(9)
Background
Pathogenic bacteria adhere to the host cell surface using a family of outer membrane proteins called Trimeric Autotransporter Adhesins (TAAs). Although TAAs are highly divergent in sequence and domain structure, they are all conceptually comprised of a C-terminal membrane anchoring domain and an N-terminal passenger domain. Passenger domains consist of a secretion sequence, a head region that facilitates binding to the host cell surface, and a stalk region.Methodology/Principal Findings
Pathogenic species of Burkholderia contain an overabundance of TAAs, some of which have been shown to elicit an immune response in the host. To understand the structural basis for host cell adhesion, we solved a 1.35 Å resolution crystal structure of a BpaA TAA head domain from Burkholderia pseudomallei, the pathogen that causes melioidosis. The structure reveals a novel fold of an intricately intertwined trimer. The BpaA head is composed of structural elements that have been observed in other TAA head structures as well as several elements of previously unknown structure predicted from low sequence homology between TAAs. These elements are typically up to 40 amino acids long and are not domains, but rather modular structural elements that may be duplicated or omitted through evolution, creating molecular diversity among TAAs.Conclusions/Significance
The modular nature of BpaA, as demonstrated by its head domain crystal structure, and of TAAs in general provides insights into evolution of pathogen-host adhesion and may provide an avenue for diagnostics. 相似文献10.
Lijuan Zhan Frederick A. Masoudi Xi Li Shuang Hu Arjun K. Venkatesh John A. Spertus Zhenqiu Lin Nihar R. Desai Jing Li Harlan M. Krumholz Lixin Jiang China PEACE Collaborative Group 《PloS one》2015,10(4)