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Nucleosome assembly proteins (Naps) influence chromatin dynamics by directly binding to histones. Here we provide a comprehensive structural and biochemical analysis of a Nap protein from Caenorhabditis elegans (CeNap1). CeNap1 naturally lacks the acidic N-terminal tail and has a short C-terminal tail compared to many other Nap proteins. Comparison with full length and a tail-less constructs of Saccharomyces cerevisiae Nap1 (ScNap1) uncovers the role of these tails in self-association, histone-binding, and competing H2A-H2B from DNA. We find that the presence of tails influences the stoichiometry of H2A-H2B-binding and is required to compete interactions between H2A-H2B and DNA. The absolute stoichiometry of the Nap protein and H2A-H2B complex is 2:1 or 2:2, with only a very small population of higher-order oligomers occurring at 150 mM NaCl. We also show that H3-H4 binds differently than H2A-H2B, and that a (H3-H4) tetramer can simultaneously bind two Nap protein homodimers.
This article was published in the following journal.
Caenorhabditis elegans (C. elegans) is a well-established model organism used across a range of basic and biomedical research. Within the nematode research community, there is a need for an affordable...
We identify the Caenorhabditis elegans myosin light-chain kinase, MLCK-1, required for contraction of spermathecae. During contraction, MLCK-1 moves from the apical cell boundaries to the basal actomy...
Aging in Caenorhabditis elegans is controlled, in part, by the insulin-like signaling and heat shock response pathways. Following thermal stress, expression levels of small heat shock protein-16.2 sho...
In mammals, mitoferrin-1and mitoferrin-2, two homologous proteins of the mitochondrial solute carrier family are required for iron delivery into mitochondria. However, there is only one kind, called W...
Reproduction is an important biological process. However, studies of human reproduction at the molecular level are limited due to the difficulty of performing in vivo studies. Hence, a mechanistic und...
This study evaluates whether whole blood transferred through the new POLFA needle assembly meets supernatant hemoglobin acceptability standards.
The aim of this study is to survey melanocytes in the ability of self-assembly on biomaterials and functional analysis in vitro. Also, this study may provide a better way for treatment of ...
The investigators examined the effects of dietary protein intake in a mixed meal at two levels of protein amount on whole body protein metabolisms in older adults.
The main objective of this study is to realise serum protein profiles for each patient undergoing a prostate biopsy and to identify relevant proteins.
The objective of the study will be to estimate the correction obtained with a metallic instrumentation, by mini-invasive technique with bipolar assembly and ilio-sacred EUROS ®) screw , w...
A histone chaperone that facilitates nucleosome assembly by mediating the formation of the histone octamer and its transfer to DNA.
Proteins from the nematode species CAENORHABDITIS ELEGANS. The proteins from this species are the subject of scientific interest in the area of multicellular organism MORPHOGENESIS.
A genus of small free-living nematodes. Two species, CAENORHABDITIS ELEGANS and C. briggsae are much used in studies of genetics, development, aging, muscle chemistry, and neuroanatomy.
A family of structurally related proteins that were originally discovered for their role in cell-cycle regulation in CAENORHABDITIS ELEGANS. They play important roles in regulation of the CELL CYCLE and as components of UBIQUITIN-PROTEIN LIGASES.
A species of nematode that is widely used in biological, biochemical, and genetic studies.
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...