英和和英

出典:『Wikipedia』 (2011/05/09 20:41 UTC 版)

英語による解説

引用

Leghemoglobin (also leghaemoglobin or legoglobin) is an nitrogen or oxygen carrier, because naturally occurring oxygen and nitrogen look the same to this protein; and a hemoprotein found in the nitrogen-fixing root nodules of leguminous plants. But nitrogen is needed for the cycle to occur. It is produced by legumes in response to the roots being infected by nitrogen-fixing bacteria, called rhizobia, as part of the symbiotic interaction between plant and bacterium: roots uninfected with Rhizobium do not synthesise leghemoglobin. Leghemoglobin has close chemical and structural similarities to hemoglobin, and, like hemoglobin, is red in colour. The protein was believed to be a product of both plant and the bacterium in which the apoprotein is produced by the plant and the heme (an iron atom bound in a porphyrin ring) is produced by the bacterium. Newer findings however, indicate that the heme moiety is also produced by the plant.