Abstract:
:The subunit composition of the myosin molecule which is built up from 3 pairs of identical polypeptide chains (2 heavy chains and 2 pairs of light chains), gives it the appearance of having symmetric structure. This homodimeric arrangement in the molecule is in fact asymmetric in its construction as a result of the natural folding of the chains. There are also heterodimers which result from combinations of pairs of heavy chains and/or light chains which are not identical in their amino acid sequence. Enzyme kinetics and ligand binding are characterised by homogeneous processes in studies on isolated myosin heads. With the double-headed molecular species, myosin and its water-soluble fragment heavy meromyosin, the enzyme kinetics, nucleotide and metal ion binding exhibit negative cooperativity. Binding of Mg-ADP to active centres induces site-site and therefore head-head interaction, thus intact myosin is designed to be able to function asymmetrically. It is suggested that the ligand-induced asymmetry between the heads plays a central role in crossbridge function. The two heads, even in rest, adopt non-equivalent conformations and it is argued that this built-in constraint complements the asymmetric mode of interaction they subsequently undergo with their reaction partners on the actin filament. It is concluded that the enzyme is so constructed that during contraction the heads can perform their function in an alternating cooperative way.
journal_name
Biochimiejournal_title
Biochimieauthors
Schaub MC,Watterson JGdoi
10.1016/s0300-9084(81)80117-4subject
Has Abstractpub_date
1981-04-01 00:00:00pages
291-9issue
4eissn
0300-9084issn
1638-6183pii
S0300-9084(81)80117-4journal_volume
63pub_type
杂志文章,评审相关文献
BIOCHIMIE文献大全abstract::A high level of subcellular compartmentalization is a hallmark of eukaryotic cells. This intricate internal organization was present already in the common ancestor of all extant eukaryotes, and the determination of the origins and early evolution of the different organelles remains largely elusive. Organellar proteome...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/j.biochi.2015.03.021
更新日期:2015-12-01 00:00:00
abstract::Maximum 125I-IGF-I/Sm-C total binding to chick embryo fibroblasts was 3% at +37 degrees C and decreased to less than 1% in presence of 2.8 X 10(-9) M unlabelled IGF-I/Sm-C. Insulin did not compete with IGF-I/Sm-C for the binding to cells. Biological action of IGF-I/Sm-C was evaluated on 2-deoxyglucose and alpha-aminoi...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/s0300-9084(85)80118-8
更新日期:1985-10-01 00:00:00
abstract::Four crystal structures of transfer RNA molecules were refined at 3 A resolution with the inclusion of the solvent molecules found in the difference maps: yeast tRNA-phe in the orthorhombic form, yeast tRNA-phe in the monoclinic form and yeast tRNA-asp in the A and B forms. Over 100 solvent molecules were located in e...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/0300-9084(88)90056-9
更新日期:1988-02-01 00:00:00
abstract::This paper deals with the discovery of plasmalogen deficiency in the cerebro-hepato-renal (Zellweger) syndrome and discusses how this has led to the development of postnatal and prenatal diagnostic procedures for this and a number of related peroxisomal disorders in man that show a general impairment in the biosynthes...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/0300-9084(93)90076-5
更新日期:1993-01-01 00:00:00
abstract::In order to study the relationship between bile cholesterol and free cholesterol carried by high and low density lipoproteins (HDL and LDL), 10 male Wistar rats, 11 weeks old and fed with a standard diet were divided into 3 groups which received an intravenous infusion (jugular vein) of either LDL, HDL or liposomes. L...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/0300-9084(87)90270-7
更新日期:1987-01-01 00:00:00
abstract::Analysis of the nucleotide sequence of 1,400 transfer RNAs has revealed the imprint of a prototypic genetic code in position 3-4-5 of the acceptor stem. It appears only in the transfer RNAs for the primordial amino acids ie those found by chemical condensation of a nitrogen-methane-water-ammonia mixture. The model for...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/0300-9084(90)90033-d
更新日期:1990-05-01 00:00:00
abstract::We have purified, by a three step procedure, a yeast C-nitrosoreductase and studied its action on p-nitroso-N,N-dimethylaniline. Microcalorimetric measurements performed on the microcalorimeter LKB "batch", have been given the number of protons exchanged during the reaction : four protons are involved. Two are given b...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/s0300-9084(75)80132-5
更新日期:1975-01-01 00:00:00
abstract::Complexes of purified 40S ribosomal subunits and initiation factor 3 from rabbit reticulocytes were crosslinked using the reversible protein crosslinking reagent, 2-iminothiolane, under conditions shown previously to lead to the formation of dimers between 40S proteins but not higher multimers. The activity of both th...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/s0300-9084(83)80062-5
更新日期:1983-07-01 00:00:00
abstract::Laccases, blue copper-containing oxidases, ≿ an play an important role in a variety of natural processes. The majority of fungal laccases are encoded by multigene families that express closely related proteins with distinct functions. Currently, only the properties of major gene products of the fungal laccase families...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2015.07.015
更新日期:2015-09-01 00:00:00
abstract::The solubilizing powers of taurocholate, taurochenodeoxycholate and tauroursodeoxycholate for monoolein and cholesterol, and the size of the bile salt-monoolein-cholesterol micelles have been determined. For the three bile salt species, the micellar size depends on the saturation with monoolein. As a result, for a giv...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/s0300-9084(82)80492-6
更新日期:1982-04-01 00:00:00
abstract::Oxidatively modified proteins are continuously produced in cells by reactive oxygen and nitrogen species generated as a consequence of aerobic metabolism. During periods of oxidative stress, protein oxidation is significantly increased and may become a threat to cell survival. In eucaryotic cells the proteasome has be...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/s0300-9084(01)01250-0
更新日期:2001-03-01 00:00:00
abstract::After 30 years of effort, the mammalian adenylate cyclase catalytic subunit has now been purified. It is a glycoprotein of 155 kDa, representing less than 0.01% of synaptosomal membrane protein. As measured in the presence of forskolin, its specific activity is 10-20 mumol of cAMP X mg-1 X min-1. The enzyme obtained i...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/0300-9084(87)90016-2
更新日期:1987-04-01 00:00:00
abstract::Theoretical and experimental investigations on the conformations of synthetic polytripeptides, with Gly-R2-R3 general repetitive sequence, are of great interest for the comprehension of the factors which contribute to the triple helix stabilization. Using appropriate molecules as models, we have investigated by the PC...
journal_title:Biochimie
pub_type: 杂志文章
doi:
更新日期:1981-11-01 00:00:00
abstract::Vegetable oils, consisting principally of triacylglycerols (TAG), are major sources of calories and essential fatty acids in the human diet. The fatty acid composition of TAG is a primary determinant of the nutritional quality and health-promoting properties of vegetable oils. TAG fatty acid composition also affects t...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/j.biochi.2020.09.020
更新日期:2020-11-01 00:00:00
abstract::About 150 participants attended the symposium organised at the Palais de la Bourse in Bordeaux, France on September 22-23, 2017. Thirty speakers from all over the world delivered lectures covering selection processes, aptamer chemistry and innovative applications of these powerful tools that display major advantages o...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2017.11.015
更新日期:2018-02-01 00:00:00
abstract::Pterocarpans, a family of isoflavonoids found in the diverse Fabaceae, display potent cytotoxic activity over a panel of tumor cell lines, and among those tested, 2,3,9- trimethoxypterocarpan displays the most potent activity. This study evaluates the effects of 2,3,9-trimethoxypterocarpan and its related derivatives ...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2014.06.005
更新日期:2014-09-01 00:00:00
abstract::Since the initial identification of leptin as the product of the ob gene in 1994, the signaling pathways by which this hormone alters cell physiology have been the subject of extensive investigations. The fact that leptin can induce nitric oxide (NO) production was first demonstrated in studies of the pituitary gland ...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/j.biochi.2012.06.017
更新日期:2012-10-01 00:00:00
abstract::The Escherichia coli protein synthesis initiation factor IF2 is a member of the large family of G-proteins. Along with translational elongation factors EF-Tu and EF-G and translational release factor RF-3, IF2 belongs to the subgroup of G-proteins that are part of the prokaryotic translational apparatus. The roles of ...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/s0300-9084(00)01200-1
更新日期:2000-12-01 00:00:00
abstract::The Rap family of small GTP-binding proteins is composed by four different members: Rap1A, Rap1B, Rap2A and Rap2B. In this work we report the identification and characterization of a fifth member of this family of small GTPases. This new protein is highly homologous to Rap2A and Rap2B, binds labeled GTP on nitrocellul...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2005.08.007
更新日期:2006-03-01 00:00:00
abstract::The hepatitis E virus (HEV) is the most common cause of acute hepatitis worldwide. Although HEV is a small, naked RNA virus, HEV particles become associated with lipids in the blood of infected patients and in the supernatant of culture systems. The egress of these particles from cells implies the exocytosis pathway b...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2017.05.003
更新日期:2017-10-01 00:00:00
abstract::Autotaxin (ATX) is a secreted lysophospholipase D involved in synthesis of lysophosphatidic acid (LPA), a phospholipid growth factor acting via specific receptors (LPA1R to LPA6R) and involved in several pathologies including obesity. ATX is secreted by adipocytes and contributes to circulating LPA. ATX expression is ...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/j.biochi.2013.04.010
更新日期:2014-01-01 00:00:00
abstract::Classic studies suggested that the common mammalian sialic acid N-glycolylneuraminic acid (Neu5Gc) is an oncofetal antigen in humans, being immunogenic in adult humans and yet apparently expressed in human fetuses and tumors. We and others have recently found that the human deficiency of Neu5Gc can be explained by an ...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/s0300-9084(01)01309-8
更新日期:2001-07-01 00:00:00
abstract::The effect of curing agents (salt, nitrate, ascorbic acid and glucose) and processing parameters (pH, water activity and drying and cooking temperatures) on pork muscle cathepsins B, D, H and L as well as leucyl, arginyl and tyrosyl hydrolysing activities is reported. Salt (60 g/l) showed a powerful inhibitory effect,...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/0300-9084(92)90128-2
更新日期:1992-03-01 00:00:00
abstract::An 18.2 kDa protein from the liver fluke, Fasciola hepatica has been identified and characterised. The protein shows strongest sequence similarity to egg antigen proteins from Schistosoma mansoni, Schistosoma japonicum and Clonorchis sinensis. The protein is predicted to adopt a calmodulin-like fold; it thus represent...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2012.06.015
更新日期:2012-11-01 00:00:00
abstract::A non-toxic, direct-acting fibrinolytic serine protease (Bafibrinase) demonstrating thrombolytic and anticoagulant properties was purified from Bacillus sp. strain AS-S20-I. Bafibrinase was monomeric, with a molecular mass of 32.3 kDa. The peptide mass fingerprinting of Bafibrinase revealed only 8.3% sequence coverage...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2012.02.027
更新日期:2012-06-01 00:00:00
abstract::The effect of alpha-tocopherol on the structure and thermotropic phase behaviour of 1-palmitoyl-2-oleoyl-phosphatidylethanolamine dispersed in excess water was examined by synchrotron X-ray diffraction and differential scanning calorimetry. Small- and wide-angle X-ray scattering intensity profiles were recorded from m...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/j.biochi.2006.07.017
更新日期:2006-12-01 00:00:00
abstract::The binding properties of Mg2+, Mn2+ and Co2+ to yeast mitochondrial oligomycin sensitive ATPase complex are studied, as reflected by their catalytic effect (hydrolysis of ATP or pNPP, a pseudo substrate) or by a physical parameter (atomic absorption, electron paramagnetic reasonance of Mn2+, enhanced fluorescence of ...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/s0300-9084(78)80701-9
更新日期:1977-01-01 00:00:00
abstract::The suhB gene of Escherichia coli has been defined by its mutant allele that suppresses other mutants in secY, rpoH, dnaB, and era. The suhB mutant by itself is cold sensitive, and is shown to have defects in protein synthesis. Starting with the suhB cold-sensitive mutant, cold-resistant suppressors were isolated. The...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/0300-9084(96)88139-9
更新日期:1995-01-01 00:00:00
abstract::This review discusses the regulation of a key controlling step in the initiation of protein synthesis, the binding of mRNA to ribosomes. Particular focus is given to the phosphorylation of the cap-binding factor, eIF-4E, and the role of this factor in the regulation of cell growth. ...
journal_title:Biochimie
pub_type: 杂志文章,评审
doi:10.1016/0300-9084(94)90185-6
更新日期:1994-01-01 00:00:00
abstract::A previous study has shown the effect of individual mineral surfaces on the activity of sweet almond beta-D-glucosidase. We now consider more complex situations likely to occur in soil, such as adsorption onto mixtures of different mineral surfaces, and the effect on enzyme activity of mineral surfaces with organic co...
journal_title:Biochimie
pub_type: 杂志文章
doi:10.1016/0300-9084(87)90197-0
更新日期:1987-06-01 00:00:00