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PubMed1981

Reassignment of residue 122 in the myoglobin from the killer whale, Orcinus orca.

The complete amino acid sequence of the major component myoglobin from killer whale, Orcinus orca, was determined by automated Edman degradation. In this study residue 122 was found to be glutamic acid instead of glutamine as was originally reported (Castillo et al. 1977). This reassignment affects the phylogenetic relationship of killer whale myoglobin with the myoglobins from other closely related cetacean species and also affects studies concerned with the physical parameters of the protein.

Amino Acid Sequence↗
PubMed1980

Comparison of the reactions of the compact-colony forming active substance (CCFAS) to the clumping-factor reaction in a strain of Staphylococcus aureus with animal plasma.

Plasma was used from rat, mouse, guinea pig, rabbit, dog, cat, sheep, goat, monkey, horse, pig, cow, fox, mink, porpoise, deer, manatee, seal, elephant, raccoon, pigeon, macaw, and humans; clotting time and gel formation activities by the compact-colony forming active substance (CCFAS) extracted from a strain of Staphylococcus aureus and relative staphylococcal clumping factor reaction were determined. Experimental results showed that every plasma was clotted and gel formation of plasma was observed by the CCFAS, however, although it was shown by the other plasmas, no clumping-factor reaction was observed with plasma from guinea pig, goat, and elephant.

Animals↗
PubMed1996

Pattern and timing of evolutionary divergences among hominoids based on analyses of complete mtDNAs.

We have examined and dated primate divergences by applying a newly established molecular/ paleontological reference, the evolutionary separation between artiodactyls and cetaceans anchored at 60 million years before present (MYBP). Owing to the morphological transformations coinciding with the transition from terrestrial to aquatic (marine) life and the large body size of the animals (which makes their fossils easier to find), this reference can be defined, paleontologically, within much narrower time limits compared to any local primate calibration marker hitherto applied for dating hominoid divergences. Application of the artiodactyl/ cetacean reference (A/C-60) suggests that hominoid divergences took place much earlier than has been concluded previously. According to a homogeneous-rate model of sequence evolution, the primary hominoid divergence, i.e., that between the families Hylobatidae (gibbons) and Hominidae, was dated at approximately 36 MYBP. The corresponding dating for the divergence between Pongo (orangutan) and Gorilla-Pan (chimpanzee) -Homo is approximately 24.5 MYBP, that for Gorilla vs Homo-Pan is approximately 18 MYBP, and that for Homo vs Pan approximately 13.5 MYBP. The split between Sumatran and Bornean orangutans was dated at approximately 10.5 MYBP and that between the common and pygmy chimpanzees at approximately 7 MYBP. Analyses of a single gene (cytochrome b) suggest that the divergence within the Catarrhini, i.e., between Hominoidea and Old World monkeys (Cercopithecoidea), took place > 40 MYBP; that within the Anthropoidea, i.e., between Catarrhini and Platyrrhini (New World monkeys), > 60 MYBP; and that between Anthropoidea and Prosimii (lemur), approximately 80 MYBP. These separation times are about two times more ancient than those applied previously as references for the dating of hominoid divergences. The present findings automatically imply a much slower evolution in hominoid DNA (both mitochondrial and nuclear) than commonly recognized.

Animals↗
PubMed1989

Limited MHC polymorphism in whales.

Little is known about disease and genetic variation in aquatic mammalian species such as whales. In this paper human HLA class I and class II probes were used to study major histocompatibility complex (MHC) genes from two species of whale: Fin (Balaenoptera physalus) and Sei (B. borealis). Stronger signals were obtained on whale than on equivalent concentrations of mouse DNA. Evidence was obtained for several DRB-related genes, a DNA genes, one DQA gene, and multiple class I genes in whales. Interestingly, the whale genes, from the small panel studied, were less polymorphic than those of humans or mice. The aquatic environment of this mammalian species may be a unique factor in shaping its immune response through the MHC.

Animals↗
PubMed1988

The separation of whale myoglobins with two-dimensional electrophoresis.

Five myoglobins (sperm whale, Sei whale, Hubbs' beaked whale, pilot whale, and Amazon River dolphin) were examined using two-dimensional electrophoresis. Previous reports indicated that none of these proteins could be separated by using denaturing (in the presence of 8-9 M urea) isoelectric focusing. This result is confirmed in the present study. However, all the proteins could be separated by using denaturing nonequilibrium pH-gradient electrophoresis in the first dimension. Additionally, all the myoglobins have characteristic mobilities in the second dimension (sodium dodecyl sulfate), but these mobilities do not correspond to the molecular weights of the proteins. We conclude that two-dimensional electrophoresis can be more sensitive to differences in primary protein structure than previous studies indicate and that the assessment seems to be incorrect that this technique can separate only proteins that have a unit charge difference.

Animals↗
PubMed1976

Variations in lipid composition and sound velocity in melon from the North Atlantic Pilot whale, globicephala melaena melaena.

Nonpolar lipids and sound velocity at different distances from the skin surface within a sample of pilot whale melon were studied. Thin layer chromatography, sensitive radioisotopic methods, and an ultrasonic echo scanner were used. Wax esters had a maximum concentration at 11-12 cm from the skin surface. Non- and monoisovalero triglycerides both exhibited a minimum at 8-10 cm, whereas the diisovalero species increased steadily from the skin surface towards the center of the pilot whale head. A minimum of sound velocity, ca. 1340 m/s, was found at 9-11 cm, thus coinciding with a region rich in isovaleric acid esterified in wax and diisovalero triglycerides. These findings are compatible with predictions based on the known correlations between lipid structure and sound velocity. Consequently, additional evidence for refraction of sound in pilot whale melon is presented. This is important in understanding the system of echolocation of toothed whales.

Animals↗