THE ATTRACTIONS OF PROTEINS FOR SMALL MOLECULES AND IONS

THE ATTRACTIONS OF PROTEINS FOR SMALL MOLECULES AND IONS The number and variety of known compounrjs between proteins and small molecules are increasing rapidly and make a fascinating story. For instance, there are the compounds of iron, which is carried in our blood plasma by a globulin, two atoms of iron to each molecule of globulin held in a rather tight salt-lie binding? which is stored as ferric hydroxide by ferritin much as water is held by a sponge? and which functions in hemoglobin, four iron atoms in tight porphyrin complexes in each protein molecule. Or, there are many compounds of serum albumin, which was used during the war by many chemists, most of whom found at least one 6ew compound. This molecule, which has about a hundred carboxyl radicals, each of which can take on a proton, and about the same number of ammonium radicals, each of which can dissociate a proton, has one single radical which combines with mercuric ion so firmly that two albumin molecules will share one mercury atom if there are not enough to go a r ~ u n d . ~ At the present stage of rapid growth of known compounds, it seems more profitable for me to make no http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of the New York Academy of Sciences Wiley

THE ATTRACTIONS OF PROTEINS FOR SMALL MOLECULES AND IONS

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Publisher
Wiley
Copyright
Copyright © 1949 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0077-8923
eISSN
1749-6632
D.O.I.
10.1111/j.1749-6632.1949.tb27297.x
Publisher site
See Article on Publisher Site

Abstract

The number and variety of known compounrjs between proteins and small molecules are increasing rapidly and make a fascinating story. For instance, there are the compounds of iron, which is carried in our blood plasma by a globulin, two atoms of iron to each molecule of globulin held in a rather tight salt-lie binding? which is stored as ferric hydroxide by ferritin much as water is held by a sponge? and which functions in hemoglobin, four iron atoms in tight porphyrin complexes in each protein molecule. Or, there are many compounds of serum albumin, which was used during the war by many chemists, most of whom found at least one 6ew compound. This molecule, which has about a hundred carboxyl radicals, each of which can take on a proton, and about the same number of ammonium radicals, each of which can dissociate a proton, has one single radical which combines with mercuric ion so firmly that two albumin molecules will share one mercury atom if there are not enough to go a r ~ u n d . ~ At the present stage of rapid growth of known compounds, it seems more profitable for me to make no

Journal

Annals of the New York Academy of SciencesWiley

Published: May 1, 1949

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