Abstract:
:Two membrane-bound ATP-dependent AAA proteases conduct protein quality surveillance in the inner membrane of mitochondria and control crucial steps during mitochondrial biogenesis. AAA domains of proteolytic subunits are critical for the recognition of non-native membrane proteins which are extracted from the membrane bilayer for proteolysis. Here, we have analysed the role of the conserved loop motif YVG, which has been localized to the central pore in other hexameric AAA(+) ring complexes, for the degradation of membrane proteins by the i-AAA protease Yme1. Proteolytic activity was found to depend on the presence of hydrophobic amino acid residues at position 354 within the pore loop of Yme1. Mutations affected proteolysis in a substrate-specific manner: whereas the degradation of misfolded membrane proteins was impaired at a post-binding step, folded substrate proteins did not interact with mutant Yme1. This reflects most likely deficiencies in the ATP-dependent unfolding of substrate proteins, since we observed similar effects for ATPase-deficient Yme1 mutants. Our findings therefore suggest an essential function of the central pore loop for the ATP-dependent translocation of membrane proteins into a proteolytic cavity formed by AAA proteases.
journal_name
J Struct Bioljournal_title
Journal of structural biologyauthors
Graef M,Langer Tdoi
10.1016/j.jsb.2006.01.009keywords:
subject
Has Abstractpub_date
2006-10-01 00:00:00pages
101-8issue
1eissn
1047-8477issn
1095-8657pii
S1047-8477(06)00018-9journal_volume
156pub_type
杂志文章abstract::Nonlinear optical processes have found widespread applications in fields ranging from fundamental physics to biomedicine. In this study, we attempted to evaluate cell activation by using the Third Harmonic Generation (THG) imaging microscopy as a new diagnostic tool. The BV-2 microglia cell line with or without activa...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2014.11.011
更新日期:2015-02-01 00:00:00
abstract::A common technique in transmission electron microscopy is the collection of a focal pair, in which the first, close to focus image contains higher resolution information at lower contrast, and the second, far from focus image has high contrast but less reliable high-resolution information. Typically these second micro...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2003.10.012
更新日期:2003-10-01 00:00:00
abstract::Structures of biological macromolecules determined by transmission cryoelectron microscopy (cryo-TEM) and three-dimensional image reconstruction are often displayed as surface-shaded representations with depth cueing along the viewed direction (Z cueing). Depth cueing to indicate distance from the center of virus part...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1006/jsbi.1997.3902
更新日期:1997-10-01 00:00:00
abstract::This is the first crystal structure of a carbohydrate induced dimer of phospholipase A(2) (PLA(2)). This is an endogenous complex formed between two PLA(2) molecules and two mannoses. It was isolated from Krait venom (Bungarus caeruleus) and crystallized as such. The complete amino acid sequence of PLA(2) was determin...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2004.11.011
更新日期:2005-03-01 00:00:00
abstract::In order to understand further the mechanism of bone fracture repair, and thus to innovate better operative treatment for bone fracture and to design new implant materials for bone repair, microstructures of external periosteal callus (EPC) of repaired femoral fracture in both children and adults were investigated by ...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1006/jsbi.1996.0084
更新日期:1996-11-01 00:00:00
abstract::X-ray imaging offers a new 3-D view into cells. With its ability to penetrate whole hydrated cells it is ideally suited for pairing fluorescence light microscopy and nanoscale X-ray tomography. In this paper, we describe the X-ray optical set-up and the design of the cryo full-field transmission X-ray microscope (TXM)...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2011.12.023
更新日期:2012-02-01 00:00:00
abstract::Electron cryo-microscopy (cryo-EM) of purified macromolecular complexes is now providing 3D-structures at near-atomic resolution (Kühlbrandt, 2014). Cryo-EM can tolerate heterogeneous specimens, however, high-resolution efforts demand highly optimized samples. Therefore, significant pre-screening and evaluation is ess...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2018.05.008
更新日期:2018-09-01 00:00:00
abstract::Charge contrast imaging (CCI) is a dynamic phenomenon recently reported in insulating and semiconducting materials imaged with low vacuum or variable pressure scanning electron microscopes (SEM). Data presented in this paper illustrates that CCI can also be applied to biominerals and biological soft-tissues and that u...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2006.04.004
更新日期:2006-09-01 00:00:00
abstract::Titin is a giant protein that spans half of the striated muscle sarcomere. The I-band portion of titin extends as the sarcomere is stretched, developing what is known as passive force. This portion of the molecule is composed mainly of tandem immunoglobulin (Ig) segments, consisting of serially linked Ig-like domains,...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1006/jsbi.1998.3984
更新日期:1998-01-01 00:00:00
abstract::Citropin 1.1 is a basic, highly hydrophobic, 16-amino acid peptide (GLFDVIKKVASVIGGL-NH(2)), displaying wide-spectrum antimicrobial activities. In this paper we describe the synthesis and antimicrobial properties of citropin 1.1 and its 18 analogs constituting mostly truncated fragments of citropin 1.1. Moreover, we e...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2009.07.012
更新日期:2009-11-01 00:00:00
abstract::The yeast peroxisomal hydrolase Lpx1 belongs to the α/β-hydrolase superfamily. In the absence of Lpx1, yeast peroxisomes show an aberrant vacuolated morphology similar to what is found in peroxisomal disorder patients. Here, we present the crystal structure of Lpx1 determined at a resolution of 1.9 Å. The structure re...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2011.06.008
更新日期:2011-09-01 00:00:00
abstract::The central shaft of a bird's flight feather bears most of the aerodynamic load during flight and exhibits some remarkable mechanical properties. The shaft comprises two parts, the calamus and the rachis. The calamus is at the base of the shaft, while the rachis is the longer upper part which supports the vanes. The s...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2020.107529
更新日期:2020-07-01 00:00:00
abstract::The photosynthetic membrane in purple bacteria contains several pigment-protein complexes that assure light capture and establishment of the chemiosmotic gradient. The bioenergetic tasks of the photosynthetic membrane require the strong interaction between these various complexes. In the present work, we acquired the ...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2010.08.010
更新日期:2011-01-01 00:00:00
abstract::This study probes the early events during lag phase of aggregation of GNNQQNY using all atom MD simulations in explicit solvent. Simulations were performed by varying system size, temperature and starting configuration. Peptides dispersed randomly in the simulation box come together early on in the simulation and form...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2015.09.020
更新日期:2015-12-01 00:00:00
abstract::This study demonstrates the effects of progesterone on eggshell quality and ultrastructure by injecting progesterone into laying hens 2 and 5 h post-oviposition, respectively. Progesterone injected 2 h post-oviposition (P4-2 h) improved eggshell quality with a significant decrease (P < 0.01) in the thickness of the ma...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2019.107430
更新日期:2020-02-01 00:00:00
abstract::Polyketides such as the clinically-valuable antibacterial agent mupirocin are constructed by architecturally-sophisticated assembly lines known as trans-acyltransferase polyketide synthases. Organelle-sized megacomplexes composed of several copies of trans-acyltransferase polyketide synthase assembly lines have been o...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2015.12.011
更新日期:2016-03-01 00:00:00
abstract::The cyclooxygenases (COX-1 and COX-2) catalyze the rate-limiting step in the biosynthesis of prostaglandins, and are the pharmacological targets of non-steroidal anti-inflammatory drugs (NSAIDs) and COX-2 selective inhibitors (coxibs). Ibuprofen (IBP) is one of the most commonly available over-the-counter pharmaceutic...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2014.11.005
更新日期:2015-01-01 00:00:00
abstract::A key to understanding control over mineral formation in mollusk shells is the microenvironment inside the pre-formed 3-dimensional organic matrix framework where mineral forms. Much of what is known about nacre formation is from observations of the mature tissue. Although these studies have elucidated several importa...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2008.01.008
更新日期:2008-05-01 00:00:00
abstract::The three-dimensional structure of Nudaurelia capensis beta virus (N beta V) was reconstructed to 3.2-nm resolution from images of frozen-hydrated virions. The distinctly icosahedral capsid (approximately 40-nm diameter) contains 240 copies of a single 61-kDa protein subunit arranged with T = 4 lattice symmetry. The o...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/1047-8477(90)90105-l
更新日期:1990-10-01 00:00:00
abstract::Bloodstream forms of Trypanosoma congolense were cocultivated in vitro with vascular endothelial cells. The trypanosomes adhere specifically to the endothelial surfaces of the anterior part of their flagella, as shown by scanning and transmission electron microscopy. The interaction between parasite and host cell is v...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1006/jsbi.1994.1014
更新日期:1994-03-01 00:00:00
abstract::Structural modeling of the HLA-DQ molecules, a group of human histocompatibility antigens linked to autoimmune diseases and immunosuppression-based on the structure of the homologous molecule DR1, has revealed an overall shape typical of the class II histocompatibility molecules, yet with several novel features. These...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1006/jsbi.1996.0079
更新日期:1996-09-01 00:00:00
abstract::Four-helical bundles are the most abundant topological motif among helical folds. Their constituent helices show crossing angles that mainly cluster around +20 degrees (aligned) or -50 degrees (orthogonal). Bundles with all helices aligned are called 'square' and comprise four-helical coiled coils as their structurall...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2010.01.023
更新日期:2010-05-01 00:00:00
abstract::Bacterial two-component regulatory systems (TCS) play important roles in sensing environmental stimuli and responding to them by regulating gene expression. VbrK/VbrR, a TCS in Vibrio parahaemolyticus, confers resistance to β-lactam antibiotics through activating a β-lactamase gene. Its periplasmic sensor domain was p...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2020.107610
更新日期:2020-11-01 00:00:00
abstract::Plasminogen activator inhibitor-1 (PAI-1) is a serine protease inhibitor (serpin) that plays an important role in cardiovascular disorders and tumor development. The potential role of PAI-1 as a drug target has been evaluated in various animal models (e.g. mouse and rat). Sensitivity to PAI-1 inhibitory agents varied ...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2010.03.006
更新日期:2010-07-01 00:00:00
abstract::The human vertebral body and intervertebral disc interface forms the region where the cartilaginous endplate, annulus fibrosis and bone of the vertebral body are connected through an intermediate calcified cartilage layer. While properties of both the vertebral body and components of the disc have been extensively stu...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2013.08.011
更新日期:2013-11-01 00:00:00
abstract::Studying nanostructured hierarchical materials such as the biomineralized bone is challenging due to their complex 3D structures that call for high spatial resolution. One route to study such materials is X-ray powder diffraction computed tomography (XRD-CT) that reveals the 3D distribution of crystalline phases and X...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2020.107631
更新日期:2020-12-01 00:00:00
abstract::Crustaceans form clots by the rapid crosslinking of a hemolymph clottable protein (CP) to form long, branched polymers. Clotting limits hemolymph loss from wounds as well as playing a part in the innate immune response. CP is a 420 kDa homodimer with a large quantity of associated lipid, primarily the carotenoid pigme...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2005.06.008
更新日期:2005-09-01 00:00:00
abstract::Microfluidics, or lab-on-a-chip technology, is proving to be a powerful, rapid, and efficient approach to a wide variety of bioanalytical and microscale biopreparative needs. The low materials consumption, combined with the potential for packing a large number of experiments in a few cubic centimeters, makes it an att...
journal_title:Journal of structural biology
pub_type: 杂志文章,评审
doi:10.1016/s1047-8477(03)00049-2
更新日期:2003-04-01 00:00:00
abstract::The formation of amyloid is considered an intrinsic ability of most polypeptides. It is a structure adopted by many neuropeptides and neurohormones during the formation of dense core vesicles in secretory cells, yet the mechanisms mediating assembly and disassembly of these amyloids remain unclear. Neurokinin B is a n...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2019.09.011
更新日期:2019-12-01 00:00:00
abstract::Vibrio alginolyticus use flagella to swim. A flagellum consists of a filament, hook and basal body. The basal body is made up of a rod and several ring structures. This study investigates the structure of the T ring which is a unique component of the V. alginolyticus sodium ion-driven flagellar basal body. Using Zerni...
journal_title:Journal of structural biology
pub_type: 杂志文章
doi:10.1016/j.jsb.2010.08.004
更新日期:2011-01-01 00:00:00