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Sirtuin 1, also known as NAD-dependent deacetylase sirtuin-1, is a protein that in humans is encoded by the SIRT1 gene. [5] [6] [7]SIRT1 stands for sirtuin (silent mating type information regulation 2 homolog) 1 (S. cerevisiae), referring to the fact that its sirtuin homolog (biological equivalent across species) in yeast (Saccharomyces cerevisiae) is Sir2.
In yeast, roundworms, and fruitflies, sir2 is the name of one of the sirtuin-type proteins (see table below). [16] Mammals possess seven sirtuins (SIRT1–7) that occupy different subcellular compartments: SIRT1, SIRT6 and SIRT7 are predominantly in the nucleus, SIRT2 in the cytoplasm, and SIRT3, SIRT4 and SIRT5 in the mitochondria. [2]
Other examples of such products are butein, piceatannol, isoliquiritigenin, fisetin, and quercetin. [citation needed] Sirtuins depend on the crucial cellular molecule called nicotinamide adenine dinucleotide (NAD+) for their function. Falling NAD+ levels during aging may adversely impact sirtuin maintenance of DNA integrity and ability to ...
The sirtuins mainly seem to be involved in regulating transcription through deacetylating histones and altering nucleosome structure. [78] However, non-histone proteins can be deacetylated by sirtuins as well. These activities of sirtuins are particularly interesting because of their importance in the regulation of aging. [79] [80]
CobB is a bacterial protein that belongs to the sirtuin family, a broadly conserved family of NAD+-dependent protein deacetylases. [2] [3] To further this, CobB is found in the Sir2 Family protein deacetylase, which is in control of energy metabolism, chemotaxis, and DNA supercoiling in many bacteria. [4]
Logistic activation function. The activation function of a node in an artificial neural network is a function that calculates the output of the node based on its individual inputs and their weights. Nontrivial problems can be solved using only a few nodes if the activation function is nonlinear. [1]
In mathematics, an injective function (also known as injection, or one-to-one function [1]) is a function f that maps distinct elements of its domain to distinct elements of its codomain; that is, x 1 ≠ x 2 implies f(x 1) ≠ f(x 2) (equivalently by contraposition, f(x 1) = f(x 2) implies x 1 = x 2).
Members of the sirtuin family are characterized by a sirtuin core domain and grouped into four classes, and the protein encoded by this gene is included in class I of the sirtuin family. [5] The human sirtuins have a range of molecular functions and have emerged as important proteins in aging, stress resistance, and metabolic regulation.