The FixL heme-based sensor, despite its low affinity for oxygen, is much more reactive than myoglobin toward the large polar ligand imidazole. To determine which features of a myoglobin heme pocket favor binding of imidazole, we have measured binding of this ligand to the FixL heme domain, elephant myoglobin, wild-type sperm whale myoglobin, and sperm whale myoglobins having alanine, valine, th...

AIMS Myoglobin is a haem protein produced in skeletal muscles. Serum concentrations of myoglobin have been proposed as a surrogate marker of muscle mass and function in both cachectic cancer patients and healthy non-cancer individuals. Creatinine, a metabolite of creatine phosphate, an energy store found in skeletal muscle, is produced at a constant rate from skeletal muscle. Urinary and plasma...

A comparative study of beta enolase and myoglobin as markers of muscle differentiation in rhabdomyosarcoma was carried out, using an immunoperoxidase peroxidase antiperoxidase technique. Material from 26 cases of childhood rhabdomyosarcoma was studied and subdivided into embryonal and alveolar types. Positive cytoplasmic staining for beta enolase was seen in 85% of tumours studied (91% alveolar...

26. Kagen, L. J., Immunofluorescent demonstrations of myoglobin in the kidney. Am. J. Med. 48,649 (1970). 27. Farmer, T. A., Jr., Hammack, W. J., and Frommeyer, W. B., Jr., Idiopathic recurrent rhabdomyolysis associated with myoglobinuria. New EngI. J. Med. 264,60(1961). 28. Glauser, S. C., Wagner, H., and Glauser, B. M., A rapid simple accurate test for differentiating hemoglobinuria from myog...

A bimetallic heme-DNA cofactor, containing an iron and a copper center, was synthesized for the design of novel hybrid catalysts for stereoselective synthesis. The cofactor was used for the reconstitution of apo-myoglobin. Both the cofactor alone and its myoglobin adduct were used to catalyze a model Diels Alder reaction. Stereoselectivity of this conversion was analyzed by chiral HPLC. Reactio...

Soft X-ray emission spectroscopy of aqueous myoglobin upon Fe 2p core excitation was carried out using a liquid cell with a 150 nm-thick polyimide window in a high vacuum chamber below 1×10−7 Pa. Fe 2p soft X-ray emission from the heme center of a met-myoglobin powder was effectively detected compared to that of an Fe2O3 powder. Fe 2p soft X-ray emission spectra for a series of aqueous-myoglobi...

1. The extent of reaction of the protein with 3,3-tetramethyleneglutaric anhydride was measured by determining the loss of lysine and the equivalent appearance of 3,3-tetramethyleneglutarimidolysine in the hydrolysate at various time-intervals. Of the 19 lysine residues in sperm-whale myoglobin, three did not react with 3,3-tetramethyleneglutaric anhydride. Also, the N-terminal valine did not r...

This paper reports Rayleigh scattering experiments on metmyoglobin crystals and freeze dried myoglobin which was exposed to air with different parital pressure of water vapor. While dry myoglobin shows no fluctuations between conformational substates such "breathing modes" are rarely seen in water covered myoglobin. Larger amounts of water increase the average mean square displacements. In crys...

The most important condition for functioning of all living aerobic organisms is continuous supply of sufficient oxygen. The access of oxygen to metabolic processes in cells is mediated by the respiratory proteins, tetrameric blood hemoglobin (Hb) and monomeric muscle myoglobin (Mb). Myoglobin is expressed in red muscles in response to mitochondrial demand for oxygen, transporting it from sarcol...

For a small adjustment in average volume, due to change state of protein or other macromolecule at constant temperature, the vibrational entropy is related mode Grüneisen parameters, which relate shifts frequency volume change. We report here values parameters computed for two hydrated proteins, cytochrome c and myoglobin, exhibit trends with resembling those glassy systems. use volumetric ther...