Activating Compound | Comment | Organism | Structure |
---|---|---|---|
additional information | detection of increased trans-urocanic acid levels in the epidermis of patients with psoriasis and in UV-treated epidermis indicates that epidermal histidase may be subject to regulation by endogenous and exogenous factors | Homo sapiens | |
additional information | expression of histidase strongly increases at the mRNA and protein levels during differentiation of primary keratinocytes in vitro | Homo sapiens | |
additional information | treatment of keratinocytes with UVA and UVB does not significantly change the expression level of histidase | Homo sapiens |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
all-trans retinoic acid | 1 microM suppresses histidase expression almost completely, levels of histidase mRNA expression in the presence of all-trans retinoic acid are significantly lower on day 2 of post-confluence and at all later time points during keratinocyte differentiation | Homo sapiens | |
interleukin-1alpha | treatment of IL-1a reduces histidase expression, the suppressive effect can be reverted by concomitant treatment with interleukin-1alpha receptor antagonist | Homo sapiens | |
TGF-alpha | most pronounced effect, leads to almost complete suppression of histidase expression | Homo sapiens | |
TNF-alpha | suppresses the expression of histidase | Homo sapiens |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-histidine | Homo sapiens | - |
trans-urocanic acid + NH3 | main ultraviolet light absorption factor of the stratum corneum, component of the natural moisturizing factor (mixture of low-molecular weight, watersoluble substances that maintain the proper hydration of the stratum corneum), trans-urocanic acid is implicated in photoaging of human skin | ? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Homo sapiens | - |
- |
- |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
epidermis | high expression level | Homo sapiens | - |
keratinocyte | epidermal | Homo sapiens | - |
liver | high expression level | Homo sapiens | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-histidine | - |
Homo sapiens | trans-urocanic acid + NH3 | main ultraviolet light absorption factor of the stratum corneum, component of the natural moisturizing factor (mixture of low-molecular weight, watersoluble substances that maintain the proper hydration of the stratum corneum), trans-urocanic acid is implicated in photoaging of human skin | ? |
Synonyms | Comment | Organism |
---|---|---|
histidase | - |
Homo sapiens |
histidine ammonia lyase | - |
Homo sapiens |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
additional information | - |
the activity optimum of histidase near pH 7 suggests that histidase is active predominantly in the lower, less acidic portion of the stratum corneum | Homo sapiens |