Aims: Definition of sense and antisense microRNA matches in 3’utr. Background: Matches of mature microRNAs (m-miRs) in human 3’utr could be traced to mutations producing fragments of original m-miR sequences without physical separation. (The m-miR matches in 5’utr and cds should be by far fewer, but could follow similar patterns). Objective: To ascertain if the sense and antisense m-miR fragments in 3’utr occur at similar or different levels. Methods: Frequency of sense and antisense m-miR matches in 3'utr was examined in the range of 7-22 nucleotides. Results: The fragmentation occurs at gene level by mutation within one of the paired m-miRs, which upon transcription results in increased interactive capability for both former pre-micro (premir) RNA stem partners. The non-mutated stem partner can persist in 3’utr sequences, as is apparent from significant presence of miR-619-5p and miR-5096 and some conservation of 20 other simian- specific m-miR sequences. However, most of m-mir sequences in 3’utr are extensively fragmented, with low preservation of long matches. In flanks of individual m-miR embeds the mutated pre-mir positions are to a degree defined specifically. Conclusion: The m-mir matches of various sizes in 3’utr apparently reflect accumulation, on a phylogenetic time scale, of in-sequence point mutations. Across human 3’utr this fragmentation is significantly less for evolutionarily recent human m-miRs that originate in simians compared to human m-miRs first appearing in lower primates, and especially to human m-miRs introduced in nonprimates.

BACKGROUND:The size of eukaryotic 25-28S rRNAs shows a progressive phylogenetically linked increase which is pronounced in mammals, and especially in hominids. The increase is confined to specific expansion segments, inserted at points that are highly conserved from yeast to man. These segments also show a progressive increase in nucleotide bias, mostly the GC bias. Substantial parts of the large expansion segments 7, 15 and 27 of 28S rRNA are known to be exposed at the ribosome surface, with no clear association with ribosomal proteins. These segments could bind extraneous RNAs and proteins to support regulatory events.METHODS:This study examined the possible canonical matching of human 28S rRNA and 18S rRNA segments with 2586 human microRNAs. This was compared with matching of the microRNAs to sectors of 18810 human mRNAs.RESULTS:The overall matching was rather similar across 18S rRNA segments and core segments of 28S rRNA. However, the expansion segments of 28S rRNA (abbreviated ESL) collectively have a much higher (up to two-fold) capacity for the canonical association with microRNAs. This is pronounced in large ESL, and is found to strongly relate to the GC content of microRNAs.CONCLUSION:Oligonucleotides and microRNAs of high GC content through a strong canonical hydrogen bonding could have large activity in regulation of subcellular RNAs. In view of the considerable abundance of ribosomal RNAs in many mammalian tissues, ESL could constitute an important component of microRNA balance, possibly serving to lower the availability of GC-rich microRNAs (and thereby help conservation of GC-rich mRNAs).

Eukaryote ribosomal RNAs (rRNAs) have expanded in the course of phylogeny by addition of nucleotides in specific insertion areas, the expansion segments. These number about 40 in the larger (25-28S) rRNA (up to 2,400 nucleotides), and about 12 in the smaller (18S) rRNA (<700 nucleotides). Expansion of the larger rRNA shows a clear phylogenetic increase, with a dramatic rise in mammals and especially in hominids. Substantial portions of expansion segments in this RNA are not bound to ribosomal proteins, and may engage extraneous interactants, including messenger RNAs (mRNAs). Studies on the ribosome-mRNA interaction have focused on proteins of the smaller ribosomal subunit, with some examination of 18S rRNA. However, the expansion segments of human 28S rRNA show much higher density and numbers of mRNA matches than those of 18S rRNA, and also a higher density and match numbers than its own core parts. We have studied that with frequent and potentially stable matches containing 7-15 nucleotides. The expansion segments of 28S rRNA average more than 50 matches per mRNA even assuming only 5% of their sequence as available for such interaction. Large expansion segments 7, 15, and 27 of 28S rRNA also have copious long (≥10-nucleotide) matches to most human mRNAs, with frequencies much higher than in other 28S rRNA parts. Expansion segments 7 and 27 and especially segment 15 of 28S rRNA show large size increase in mammals compared to other metazoans, which could reflect a gain of function related to interaction with non-ribosomal partners. The 28S rRNA expansion segment 15 shows very high increments in size, guanosine, and cytidine nucleotide content and mRNA matching in mammals, and especially in hominids. With these segments (but not with other 28S rRNA or any 18S rRNA expansion segments) the density and number of matches are much higher in 5'-terminal than in 3'-terminal untranslated mRNA regions, which may relate to mRNA mobilization via 5' termini. Matches in the expansion segments 7, 15, and 27 of human 28S rRNA appear as candidates for general interaction with mRNAs, especially those associated with intracellular matrices such as the endoplasmic reticulum.

Background: Human microRNAs (miRs) that have been evaluated toward medical application are largely the early-introduced sequences numbered below 1000, with GC content close to Drosophila melanogaster fruitfly, but rather below current averages for human miRs. The research bias toward low database numbers and low GC content is found for all sectors of human miRs. Keywords: AU content, GC content, microRNA categories, nucleotide iterons, polynucleotide mRNA interaction, RNA hydrogen bonding.

BACKGROUND Heptahelical G protein coupled receptors (GPCRs) support numerous sensory and metabolic functions and differ considerably in levels of expression. GPCR protein levels should link to regulation of GPCR mRNAs by microRNAs (miRs), which might significantly depend on numbers, size and GC content of the canonical antisense matches in mRNAs. These parameters of GPCR mRNAs have not been studied in detail. METHODS Canonical matching profiles of human GPCR mRNAs and miRs were examined using segments of 7-15 nucleotides in windows shifted by one position over the entire microRNA sequence. RESULTS Human GPCRs mRNAs within larger function-related groups have a quite homogenous matching with miRs. Both the GC content and the melting temperature (and hence also the binding energy) are appreciably higher in 5'utr compared to 3'utr matches of the same length. Increase in the GC content correlates significantly with length in the ubiquitous matches of 7-12 nucleotides. However, several GPCR groups strongly differ in overall match numbers and density. The untranslated regions of sensory receptor mRNAs, especially the olfactory and Taste-2 mRNAs, have the lowest match numbers and density and the fewest miR partners. The glucagon and frizzled families show the highest canonical matching. CONCLUSION Partnership of GPCR mRNAs and miRs could significantly relate to the type of function of the receptor proteins, with mRNAs of the sensory receptors having the lowest and those of metabotropic GPCRs the highest targeting. This could be of interest regarding GPCR regulation by exogenous miRs.

BACKGROUND:Canonical hydrogen-bonding multi-nucleotide matches of microRNAs (miRs) with mRNAs are considered as important in mRNA regulation. MiR "seed" positions 2-8 are frequently viewed as mRNA partners, but there is ample evidence for use of other (and even non-contiguous) miR parts. No detailed information is available about canonical matching, and the GC content of the matches is rarely considered, although it should have a major regulatory potential.METHODS:Sequences of 2586 human miRs and of 5'utr, cds and 3'utr in 18810 human mRNAs were examined for number and GC content of contiguous Watson-Crick antisense matches of six or more nucleotides (nt) in successive windows shifted by 1 nt.RESULTS:Frequency of the antisense matches is within all sectors similar for segments of up to 10 nt starting at positions 1-10 of miR sequences, with decrease of 3.5 to 4-fold for each 1-nt increment. Adenine and uracil rich elements (ARE-like) are very frequent in cds and 3'utr. All mRNAs have matches of up to 10 nt, and most also those of 11-15 nt. The match density is largest in 5'utr, and the match number in cds. The 5'utr and cds matches average much higher GC content than those of 3'utr. The GC content of matches is above that for the whole sector in 5'utr and cds, but lower in 3'utr.CONCLUSION:Human mRNA matches across miR sequences constitute a positionally similar matrix of canonical hydrogen-bonding reactivity. This presents ample opportunities for contiguous binding independent of miR position. The ubiquitous 10 to 15-nt matches could serve as binding foci. Interaction of miRs with the abundant GC-rich 5'utr and cds counterparts could be important in the regulation of mRNA-ribosome interaction as well as in mRNA disposal. The lower density and GC content of a majority of 3'utr matches could mainly support a dynamic regulation by miRs.

BACKGROUND:Same-nucleotide repeats (iterons) are strongly expressed in many DNA regions and RNA classes. These repeats serve importantly in association of polynucleotides and proteins, but have not been characterized in miRNAs.METHODS:Iterons and nucleotide strings were quantified in currently known human miRNAs, including some comparisons with miRNAs of other species.RESULTS:Human 5p miRNAs have significantly more G iterons than other miRNA groups. The 3p miRNAs have an inverse excess of C iterons. The miRNAs lacking functional counter-stems (which we differentiate as 5n or 3n by position in pre-miRNAs) also have a large excess of G iterons. In 5p miRNAs G and C iterons have much higher density in the seed compared to the post-seed region. This difference is lower in 5n and 3n sequences, and much lower in 3p sequences. In all groups the contiguous GC strings constitute a larger part of sequences than the AU strings. A surplus of G or C iterons and of GC strings should enable a more stable association with the target mRNAs.CONCLUSION:From the available evidence, the G iteron- and GC-rich miRNAs should also interact more readily with miRNA-processing and similar proteins.

Ribosomal RNAs in both prokaryotes and eukaryotes feature numerous repeats of three or more nucleotides with the same nucleobase (homoiterons). In prokaryotes these repeats are much more frequent in thermophile compared to mesophile or psychrophile species, and have similar frequency in both large RNAs. These features point to use of prokaryotic homoiterons in stabilization of both ribosomal subunits. The two large RNAs of eukaryotic cytoplasmic ribosomes have expanded to a different degree across the evolutionary ladder. The big RNA of the larger subunit (60S LSU) evolved expansion segments of up to 2400 nucleotides, and the smaller subunit (40S SSU) RNA acquired expansion segments of not more than 700 nucleotides. In the examined eukaryotes abundance of rRNA homoiterons generally follows size and nucleotide bias of the expansion segments, and increases with GC content and especially with phylogenetic rank. Both the nucleotide bias and frequency of homoiterons are much larger in metazoan and angiosperm LSU compared to the respective SSU RNAs. This is especially pronounced in the tetrapod vertebrates and seems to culminate in the hominid mammals. The stability of secondary structure in polyribonucleotides would significantly connect to GC content, and should also relate to G and C homoiteron content. RNA modeling points to considerable presence of homoiteron-rich double-stranded segments especially in vertebrate LSU RNAs, and homoiterons with four or more nucleotides in the vertebrate and angiosperm LSU RNAs are largely confined to the expansion segments. These features could mainly relate to protein export function and attachment of LSU to endoplasmic reticulum and other subcellular networks.

While the ribosome constitution is similar in all biota, there is a considerable increase in size of both ribosomal proteins (RPs) and RNAs in eukaryotes as compared to archaea and bacteria. This is pronounced in the large (60S) ribosomal subunit (LSU). In addition to enlargement (apparently maximized already in lower eukarya), the RP changes include increases in fraction, segregation and clustering of basic residues, and decrease in hydrophobicity. The acidic fraction is lower in eukaryote as compared to prokaryote RPs. In all eukaryote groups tested, the LSU RPs have significantly higher content of basic residues and homobasic segments than the SSU RPs. The vertebrate LSU RPs have much higher sequestration of basic residues than those of bacteria, archaea and even of the lower eukarya. The basic clusters are highly aligned in the vertebrate, but less in the lower eukarya, and only within families in archaea and bacteria. Increase in the basicity of RPs, besides helping transport to the nucleus, should promote stability of the assembled ribosome as well as the association with translocons and other intracellular matrix proteins. The size and GC nucleotide bias of the expansion segments of large LSU rRNAs also culminate in the vertebrate, and should support ribosome association with the endoplasmic reticulum and other intracellular networks. However, the expansion and nucleotide bias of eukaryote LSU rRNAs do not clearly correlate with changes in ionic parameters of LSU ribosomal proteins.

The status and use of transmembrane, extracellular and intracellular domains in oligomerization of heptahelical G-protein coupled receptors (GPCRs) are reviewed and for transmembrane assemblies also supplemented by new experimental evidence. The transmembrane-linked GPCR oligomers typically have as the minimal unit an asymmetric ~180 kDa pentamer consisting of receptor homodimer or heterodimer and a G-protein αβγ subunit heterotrimer. With neuropeptide Y (NPY) receptors, this assembly is converted to ~90 kDa receptor monomer-Gα complex by receptor and Gα agonists, and dimers/heteropentamers are depleted by neutralization of Gαi subunits by pertussis toxin. Employing gradient centrifugation, quantification and other characterization of GPCR dimers at the level of physically isolated and identified heteropentamers is feasible with labeled agonists that do not dissociate upon solubilization. This is demonstrated with three neuropeptide Y (NPY) receptors and could apply to many receptors that use large peptidic agonists.

Based on ubiquitous presence of large ionic motifs and clusters in proteins involved in gene transcription and protein synthesis, we analyzed the distribution of ionizable sidechains in a broad selection of proteins with regulatory, metabolic, structural and adhesive functions, in agonist, antagonist, toxin and antimicrobial peptides, and in self-excising inteins and intron-derived proteins and sequence constructs. All tested groups, regardless of taxa or sequence size, show considerable segregation of ionizable sidechains into same type charge (homoionic) tracts. These segments in most cases exceed half of the sequence length and comprise more than two-thirds of all ionizable sidechains. This distribution of ionic residues apparently reflects a fundamental advantage of sorted electrostatic contacts in association of sequence elements within and between polypeptides, as well as in interaction with polynucleotides. While large ionic densities are encountered in highly interactive proteins, the average ionic density in most sets does not change appreciably with size of the homoionic segments, which supports the segregation as a modular feature favoring association.

For many G-protein coupling receptors (GPCRs), the upkeep of receptor dimers could depend on association with functional Gi α subunits. This is known for Y1, Y2 and Y4 neuropeptide Y receptors [presented in the companion paper (Estes et al., Amino Acids, doi: 10.1007/s00726-010-0642-z, 2010)]. Interactions with transducers use mainly intracellular domains of the receptors. Intracellular loops 1 and 2 in GPCRs are short and lack extensive helicity that could support transducer anchoring. Interaction with G-proteins is known to use the juxtamembrane Helix 8 in the fourth intracellular domain, for which we document a helix-stabilizing n/(n + 4) pattern of large hydrophobic sidechains. Another intracellular helix located in the C-terminal portion of the third intracellular loop does not display a strong stabilizing pattern, and is found in many studies to serve dynamically in association and activation of transducers and effectors. We show that these tracts share features across metazoan phyla not only in opsins and opsin-like receptors (including the Y receptors), but also in Taste-2 and Frizzled receptors. Similarities of these helices across GPCR groups could have both phylogenetic and functional roots.

Treatment of CHO cells expressing human Y receptors (Y(1), Y(2) or Y4 subtype) with pertussis toxin results in a large decrease in functional receptors, with a preferential loss of heteropentameric assemblies of receptor dimers and G-protein trimers. This occurs in parallel to inactivation of the nucleotide site of Gi α subunits, with a half period of about 4 h. The loss could be mainly due to proteolysis at the level of recycling/perinuclear endosomes, and of receptor completion in the ER, since it is reduced by co-treatment with ammonium chloride, an inhibitor of particulate proteinases. Antagonists do not strongly decrease the heteropentameric fraction. These findings indicate that the upkeep of Y receptor dimers in epithelial cell lines depends on the association of receptor oligomers with functional Gi α subunits. This interaction could use the juxtamembrane helix 8 in the fourth intracellular domain, and could also be supported by the C-terminal helix of the third intracellular loop, as outlined in the companion review (Parker et al., Amino Acids, doi: 10.1007/s00726-010-0616-1 , 2010).

The neuropeptide Y (NPY) Y2 receptor shows a large masked surface population in adherent CHO cells or in forebrain cell aggregates, but not in dispersed cells or in particulates from these sources. This is related to adhesion via acidic motifs in the extracellular N-terminal domain. Masking of the Y2 receptor is lifted by non-permeabilizing mechanical dispersion of cells, which also increases internalization of Y2 agonists. Mechanical dispersion and detachment by EDTA expose the same number of surface sites. As we have already shown, phenylarsine oxide (PAO), a cysteine-bridging agent, and to a lesser extent also the cysteine alkylator N-ethylmaleimide, unmask the surface Y2 sites without cell detachment or permeabilization. We now demonstrate that unmasking by permeabilizing but non-detaching treatment with cholesterol-binding detergents digitonin and edelfosine compares with and overlaps that of PAO. The caveolar/raft cholesterol-targeting macrolide filipin III however produces only partial unmasking. Depletion of the surface sites by N-terminally clipped Y2 agonists indicates larger accessibility for a short highly helical peptide. These findings indicate presence of a dynamic masked pool including majority of the cell surface Y2 receptors in adherent CHO cells. This compartmentalization is obviously involved in the low internalization of Y2 receptors in these cells.

Non-specific binding of Y receptor agonists to intact CHO cells, and to CHO cell or rat brain particulates, is much greater for human neuropeptide Y (hNPY) compared to porcine peptide Y (pPYY), and especially relative to human pancreatic polypeptide (hPP). This binding of hNPY is reduced by alkali cations in preference to non-ionic chaotrope urea, while the much lower non-specific binding of pPYY is more sensitive to urea. The difference could mainly be due to the 10-16 stretch in 36-residue Y agonists (residues 8-14 in N-terminally clipped 34-peptides), located in the sector that contains all acidic residues of physiological Y agonists. Anionic pairs containing aspartate in the 10-16 zone could be principally responsible for non-specific attachments, but may also aid the receptor site binding. Two such pairs are found in hNPY, one in pPYY, and none in hPP. The hydroxyl amino acid residue at position 13 in mammalian PYY and PP molecules could lower conformational plasticity and the non-selective binding via intrachain hydrogen bonding. The acidity of this tract could also be important in agonist selectivity of the Y receptor subtypes. The differences point to an evolutionary reduction of promiscuous protein binding from NPY to PP, and should also be important for Y agonist selectivity within NPY receptor group, and correlate with partial agonism and out-of group cross-reactivity with other receptors. (C) 2010 Elsevier Inc. All rights reserved.

The C‐terminal tract in the third intracellular (ic3) domain, and the juxtamembrane tract in the fourth intracellular (ic4) domain of G‐protein coupling receptors are known to interact with G‐proteins. Both segments show considerable conservation of sequence and size. These tracts have 12–17 residues, large content of basic sidechains, and high potential helicity. This is found regardless of domain size (which can exceed 400 residues), or the preferred G‐protein alpha subunit, and should represent a designated ability to interact with transducers. Association of either tract with transducers could be enhanced by restricted mobility (due to interaction with the bilayer) and broadside orientation, and could involve especially the long C‐terminal anion sidechain‐rich stretches in G‐protein subunits. Both tracts also show little phosphorylation compared to the rest of their domains, indicating a low processing by kinases and phosphatases, and low involvement in disassembly of transductional complexes. Helix 8 could perform as primary G‐protein partner, in the stable precoupling of receptors and G‐proteins as well as in GTPase activation upon agonist attachment. This is evidenced by effect of pertussis toxin on receptor/G‐protein heteropentamers. The ic3 C‐terminal helix could assist G‐protein coupling, and is widely known to perform in transducer activation.

The minimal size of the fourth intracellular domain of heptahelical G-protein coupling receptors (GPCRs) is close to 15 residues, and a juxtamembrane 15-residue segment is predicted as helical (Helix-8) in most of the receptors. Sequences of opsins, non-visual opsin-like (family A) GPCRs and Taste-2 receptors correspond with bovine rhodopsin at four positions in this tract. This is especially evident in monoamine receptors. In most GPCRs, the conserved juxtamembrane segment also has a large fraction of basic sidechains, and a considerable excess of cationic over anionic residues. The conservation is not dependent on the preferred G-protein α subunit or the overall length of the domain, indicating an additive speciation. In rod opsins and some A-GPCRs this segment has been shown to associate with the bilayer and to interact with G-proteins. The segment could also be involved in precoupling of receptors and transducers. These interactions could be helped by both the structural propensities and the high content of cationic sidechains.

The heptahelical G protein coupling receptors oligomerize extensively via transmembrane domains, in association with heterotrimeric G proteins. This provides higher affinity for agonists, conformational stability necessary for signal transduction, and protection from intracellular proteinases. The oligomerization is relevant to organismic pathophysiology and could be targeted by natural or modified agonists.

Neuropeptide Y (NPY) and peptide YY (PYY) bind to similar numbers of high‐affinity sites in both native and clonal expressions of the NPY Y1 receptor. However, NPY binds to a much larger number of sites poorly competed by NPY or PYY, or by Y1‐selective agonist BIBP‐3226. This 'non‐specific' binding is much larger with the brain Y1 receptor, apparently due to high G‐protein content. The sites are associated largely with the pertussis toxin‐persisting fraction of ~90 kDa complexes of the monomeric receptor and G‐protein alpha subunits, and are not apparent in ~180 kDa heteropentamers of the Y1 receptor dimer and non‐activated G‐protein heterotrimers. High concentrations of NPY (but not of PYY) block the surface Y1 sites and internalization in CHO cells. Inhibition of adenylate cyclase by NPY in Y1‐CHO cells is significantly less than that by PYY. These findings indicate that Y1 receptor‐attached NPY could also bind to G‐protein alpha subunits associated with the receptor, inducing lower activation, transduction, and cycling. This could be important in the regulation of activity and in conservation of both the Y1 receptor and G‐proteins in NPY‐rich environments, e.g. in the forebrain.