Beta-actinin-like protein from plasmodium.

K Maruyama; R Kamiya; S Kimura; S Hatano

doi:10.1093/oxfordjournals.jbchem.a131122

Home/Archive/PubMed

PubMed · 945265

Beta-actinin-like protein from plasmodium.

K Maruyama·R Kamiya·S Kimura·S Hatano

View original source ↗Export metadata ↓

Abstract

A beta-actinin-like protein was isolated from plasmodia of the slime mold. The chain weight was the same as that of actin (43,000), but the amino acid composition was significantly different. The action of plasmodium beta-actinin on actin was the same as that of beta-actinin from rabbit skeletal muscle: inhibition of the recombination of F-actin fragments; formation of Mg polymer; inhibition of interfilamental interaction of F-actin and retardation of depolymerization of F-actin. The only difference observed was its sensitivity to trypsin: plasmodium actinin was less quickly digested by trypsin than rabbit beta-actinin.

Explore related subjects

Actinin Actins Amino Acids Animals Binding Sites Circular Dichroism Macromolecular Substances Magnesium Molecular Weight Muscle Proteins Myxomycetes Physarum Plasmodium Protein Binding Protein Conformation Spectrophotometry, Ultraviolet Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

K Maruyama, R Kamiya, S Kimura, S Hatano. 1976. Beta-actinin-like protein from plasmodium.. https://doi.org/10.1093/oxfordjournals.jbchem.a131122

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2025

The frequency of the ACTN3 polymorphism in Brazil: a systematic review and meta-analysis.

BACKGROUND: The ACTN3 gene encodes the protein alpha-actinin-3, which is crucial for fast-twitch muscle fibers, contributing to rapid and forceful contractions. The distribution of these genotypes and their impact on sports performance in Brazilian populations are not well-documented. This study aimed to determine the allelic and genotypic frequency of the ACTN3 R/X polymorphism in Brazil and its association with sports performance. METHODS: A systematic review was conducted, including studies sourced from PubMed, Scielo, LILACS, LIPECS, Coleciona SUS, CUMED, BINACIS, IBECS, and MEDLINE databases, resulting in 42 studies included. The quality of these studies was assessed using the Strengthening the Reporting of Genetic Association (STREGA) guidelines. RESULTS: Among all the 8,746 participants, 35.2% had the RR genotype, 46.2% had the RX genotype, and 18.6% had the XX genotype. Regarding allelic frequency, 58.3% were R allele carriers, while 41.7% were X allele carriers. Meta-analysis showed that there was no consistent association between the ACTN3 genotypes and sports performance, although some data suggested potential benefits in athletic performance. CONCLUSION: This study revealed that the RX genotype of the ACTN3 R577X polymorphism is the most prevalent in Brazil, followed by the RR and XX genotypes. While the R allele was more frequent, the meta-analysis did not confirm a consistent association between ACTN3 genotypes and sports performance, suggesting that other genetic and environmental factors contribute to athletic success.

Actinin↗

PubMed2007

Limited plasticity of mesenchymal stem cells cocultured with adult cardiomyocytes.

In order to assess, in a controlled in vitro model, the differentiation potential of adult bone marrow derived stem cells we have developed a coculture procedure using adult rat cardiomyocytes and mesenchymal stem cells (MSCs) from transgenic GFP positive rats. We investigated in the cocultured MSCs the time course of cellular processes that are difficult to monitor in in vivo experiments. Adult rat cardiomyocytes and adult rat MSCs were cocultured for up to 7 days and analyzed by confocal microscopy. Several markers were studied by immunofluorescence technique. The fluorescent ST-BODIPY-Dihydropyridine was used to label calcium channels in living cells. Intracellular calcium was monitored with the fluorescent probe X-Rhod-1. Immunofluorescence experiments showed the presence of connexin-43 between cardiomyocytes and MSCs and between MSCs, while no sarcomeric structures were observed at any time of the coculture. We looked at the expression of calcium channels and development of voltage-dependent calcium signaling in cocultured MSCs. MSCs showed a time-dependent increase of labeling of ST-BODIPY-Dihydropyridine, reaching a relatively strong level after 72 h of coculture. The treatment with a non-fluorescent DHP, Nifedipine, completely abolished ST-BODIPY labeling. We investigated whether depolarization could modulate intracellular calcium. Depolarization-induced calcium transients increased in MSCs in relation to the coculture time. We conclude that MSCs cocultured with adult cardiomyocytes present preliminary evidence of voltage-dependent calcium modulation uncoupled with the development of nascent or adult myofibrils, thus showing a limited lineage specification and a low plasticity to differentiate in a full cardiomyocyte-like phenotype.

Actinin↗

PubMed2007

ACTN3: A genetic influence on muscle function and athletic performance.

A common variant of the ACTN3 gene, R577X, results in complete deficiency of the alpha-actinin-3 protein in the fast skeletal muscle fibers of more than a billion humans worldwide. We review the evidence that this genetic variant is strongly associated with elite athlete status and with normal variation in human muscle strength and sprinting speed.

Actinin↗