نتایج جستجو برای: zinc metalloenzymes
تعداد نتایج: 74030 فیلتر نتایج به سال:
Carbonic anhydrases (CA) are zinc-containing metalloenzymes that catalyze the reversible hydration of CO2. The three evolutionarily unrelated families of CAs are designated alpha-, beta-, and gamma-CA. Aquatic photosynthetic organisms have evolved different forms of CO2 concentrating mechanisms (CCMs) to aid Rubisco in capturing CO2 from the surrounding environment. One aspect of all CCMs is th...
Histidine is a very common metal ligand in metalloenzymes. Besides being an efficient Lewis base, its electronic properties are essential to shape the metal ability to catalyze the reaction. Here we show that histidine's properties can be tuned, in turn, by an easy proton transfer to a nearby glutamate. We study this situation in Human Carbonic Anhydrase II (HCA II) in which one of the three hi...
Carboxypeptidase A1 has been the subject of extensive research in the last 30 y and is one of the most widely studied zinc metalloenzymes. However, the three-dimensional structure of the human form of the enzyme is not yet available. This report describes the three-dimensional structure of human carboxypeptidase A1 (hCPA1) derived from crystals that belong to the tetragonal space group P4(3)2(1...
Carbonic anhydrases (CAs) are zinc-containing metalloenzymes that catalyze the interconversion of carbon dioxide and bicarbonate. The alpha-class CAs are found predominantly in vertebrates, but they are also expressed in insects like mosquitoes. Recently, an alpha-CA from the midgut of Aedes aegypti larvae (AaCA1) was identified, cloned, and subsequently shown to share high sequence homologous ...
Disability or death due to intracerebral hemorrhage (ICH) is attributed to blood lysis, liberation of iron, and consequent oxidative stress. Iron chelators bind to free iron and prevent neuronal death induced by oxidative stress and disability due to ICH, but the mechanisms for this effect remain unclear. We show that the hypoxia-inducible factor prolyl hydroxylase domain (HIF-PHD) family of ir...
The spectra of functionally essential, chromophoric metal atoms of metalloenzymes are thought to reflect catalytic potential [Vallee and Williams (1968) Proc. Nat. Acad. Sci. USA 59, 498]. The spectra of cobalt procarboxypeptidase and their perturbations by substrates and inhibitors are virtually the same as those of cobalt carboxypeptidase; both are consistent with a distorted tetrahedral geom...
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