An iron-containing molecule that binds with proteins as a cofactor or prosthetic group to form the haemoproteins. These are haemoglobin, myoglobin, and the cytochromes. Essentially, haem comprises a porphyrin with its four nitrogen atoms holding the iron(II) atom as a chelate. This iron can reversibly bind oxygen (as in haemoglobin and myoglobin) or (as in the cytochromes) conduct electrons by conversion between the iron(II) and iron(III) series.
Haem
An iron-containing molecule (see formula) that binds with proteins as a cofactor or prosthetic group to form the haemoproteins. These are haemoglobin, myoglobin, and the cytochromes. Essentially, haem comprises a porphyrin with its four nitrogen atoms holding the iron(II) atom as a chelate. This iron can reversibly bind oxygen (as in haemoglobin and myoglobin) or (as in the cytochromes) conduct electrons by conversion between the iron(II) and iron(III) series.
Haem
- Gravettian
- gravimeter
- gravimetric analysis
- gravimetry
- gravitation
- gravitational acceleration
- gravitational collapse
- gravitational constant
- gravitational deflection
- gravitational energy
- gravitational equipotential
- gravitational field
- gravitational field strength
- gravitational force
- gravitational instability
- gravitational interaction
- gravitational lens
- gravitational lensing
- gravitational mass
- gravitational potential
- gravitational potential energy
- gravitational radiation
- gravitational redshift
- gravitational shift
- gravitational signature