|Detection of Mouse and Rat Kynureninase by Western Blot. Western blot shows lysates of mouse liver tissue and rat liver tissue. PVDF membrane was probed with 0.25 µg/mL of Sheep Anti-Mouse Kynureninase Antigen Affinity-purified Polyclonal Antibody (Catalog # AF7389) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for Kynureninase at approximately 50-55 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.|
Kynu (kyureninase (a hydrolase that acts on dog [Greek: kyon] urine [Greek: ouron]) is a 52-55 kDa member of the kyureninase family of enzymes. It is a pyridoxal phosphate-dependent cytosolic hydrolase that occurs in a variety of cell types, including hepatocytes and macrophages. Kynu participates in the metabolism of tryptophan. Dietary Trp is either incorporated into protein, or metabolized into niacin, serotonin or NAD. Kynu catalyzes one of two steps that lead to the formation of a key downstream intermediate called 3-hydroxyanthranilic acid. Mouse Kynu is 464 amino acids (aa) in length. It contains one large catalytic site (aa 24-462), and typically functions as a noncovalent homodimer. There are at least two potential isoform variants. One contains a three aa substitution for aa 425-464, while another possesses a 22 aa substitution for aa 302-464. Over aa267-464 mouse Kynu shares 91% and 80% aa sequence identity with rat and human Kynu, respectively.
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