LYCOS RETRIEVER 
Chlorophyll: Heme
built 647 days ago
Chlorophyll is a chlorin pigment, which is structurally similar to and produced through the same metabolic pathway as other porphyrin pigments such as heme. At the center of the porphyrin ring is a magnesium ion. The chlorin ring can have several different side chains, usually including a long phytol chain. There are a few different forms that occur naturally:
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Chlorophyll is a cyclic tetrapyrolle, similar in structure to the heme group of globins (hemoglobin, myoglobin) and cytochromes. Chlorophyll differs from heme in a few major respects, most notably that the central metal ion in chlorophyll is magnesium while that in heme is iron.
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Chlorophyll is essentially two parts: a substituted porphyrin ring and phytol (the long carbon chain). The porphyrin ring is an excellent chelating ligand, with the four nitrogen atoms binding strongly to a co-ordinated metal atom in a square planar arrangement. There are many examples of this including heme and vitamin B12.
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Chlorophyll is a chlorin pigment, related to the porphyrin containing iron compound known as heme. At the center of the ring is a magnesium ion. The side chains vary somewhat between the different forms of chlorophyll found in different organisms - chlorophyll a is always present, but chlorophylls b and c ... occur in various groups.
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Chlorophyll is a porphyrin pigment, as are several other important organic compounds, notably Heme. At the center of the ring is a magnesium ion. The side chains vary somewhat between the different forms of chlorophyll found in different organisms - chlorophyll a is always present, but chlorophylls b and c ... occur in various groups.
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