Examples of histidine

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In each ab-apoprotein pair one histidine comes from the a-apoprotein and one from the b-apoprotein.
The glycine receptor has a histidine, which is an aromatic ring structure, in-between the two amino acids.
Even better, the substitution changed the code for a histidine to that for an arginine.
The direct ligands to iron, the porphyrin and the proximal histidine, are obviously also needed in the model.
Bacteriophytochromes are photochromic histidine kinases using a biliverdin chromophore.
Yeast carrying such a mutation do not grow on minimal medium without histidine.
This type of phosphorelay signalling, which is likely to function via histidine protein kinases, involves signal receptors for ethylene, cytokinins, light and osmolarity.
This has been expected since the histidine kinase family does not qualify on the sequence level as member of this superfamily.
Finally, one amino acid looks like an afterthought : the pathway to histidine is an extension of nucleotide synthesis and takes 26 steps in all.
The ligands on these dimers are mainly histidines.
One of the aspartates that formerly interacted with the tyrosine now forms a hydrogen bond with a conserved histidine.
The thioredoxin interaction area is different and contains more hydrophobic residues and three histidines one of them very close to the active site.
In the absence of cysteines and histidines, glutamate and aspartates can serve as sites of action.
This relay mechanism eliminates the need for histidine tautomerization and explains the available data, suggesting proton binding during transport.
This assumes that the key functional group in all human tissues (including brain) is histidine imidazole.
Sensor domains were identified as the segment between predicted transmembrane helices associated with histidine kinase domains.
The reason for this is easily understood since ammonia forms a hydrogen bond that imidazole (or histidine) cannot form.

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