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see coenzymecoenzyme
, any one of a group of relatively small organic molecules required for the catalytic function of certain enzymes. A coenzyme may either be attached by covalent bonds to a particular enzyme or exist freely in solution, but in either case it participates intimately in
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the nonprotein component (the so-called prosthetic group) and the coloring matter of hemoglobin.

Chemically, heme is a compound of protoporphyrin and divalent iron. In the vertebrate body heme is synthesized from simpler nitrogen compounds (glycine and succinate) and from ferritin, a reserve iron-protein complex present in the spleen, liver, and bone marrow. The heme isolated from the blood of various vertebrates always has the same structure:

Free heme readily oxidizes in air to hematin, in which the iron atom is trivalent. Many years of research on the structure of heme were rewarded by the synthesis in 1929 by H. Fischer of hemin, the hydrochloride of heme.


C34H32O4N4Fe An iron-protoporphyrin complex associated with each polypeptide unit of hemoglobin.
References in periodicals archive ?
Bruce Willis got steamy with his wife Emma Heming on the red carpet in Berlin at the premiere of A Good Day To Die Hard.
SETTLED DOWN J After divorcing Demi Moore in 2000, Bruce has found love again with British wife Emma Heming, above EXPLOSIVE J Bruce and Jai Courtney, who plays his son, above, team up in the latest Die Hard movie
But because Heming could not be found, the coroner recorded a verdict of 'murder by persons unknown'.
I can't think of another group of people who work at really hard jobs, FAMILY GUY: Willis with, from left, Ashton Kutcher, Demi Moore, Micah Alberti, Rumer Willis, Emma Heming, Tallulah Belle Willis, unidentified guest, and Scout Willis who get shot at every night for their jobs, and who could use an opportunity to go out and have a good laugh.
Willis, 54, and Heming, who wed in March in Turks and Caicos, looked at the 101-year-old building's interior garden courtyard and units, the sources said.
Heming, 32, is a model for the racy "Victoria s Secret," line of lingerie.
Willis, 54, and Heming, 30, held another ceremony in LA on Friday.
He is survived by his wife of 62 years, Eva Mae Piper; his son, Jon of Leicester, MA; his daughter, Carol Heming of Warrensburg, MO; also three grandchildren, Michael, Valerie, Jaymie; and three great-grandsons, Jurgen, Richard, and Mathew.
My understanding is that there will not be a major switch to it (for alkyd resins production) in Europe as an alternative material," said Mike Heming, CEO of Paris-based HB International, a leading glycerine broker.
The school invited Saj Heming from Dartington school of arts in Kent to teach youngsters how to play gong kebyars.
Deep River CIC Local Section's new chair, Marcel Heming, MCIC, addresses these issues in his first letter to Section members.
Pete'' Knight, R-Palmdale; Donna Tremeer, representing Assemblyman George Runner, R-Lancaster; Don Maben, representing Kern County Supervisor Steve Perez; Lancaster Mayor Frank Roberts; Palmdale Mayor James Ledford; Lancaster Chamber of Commerce President Steve Malicot; Jeanette Heming of the Palmdale Chamber of Commerce; and Pete Eskis, manager of the state Employment Development Department's Lancaster office.