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The organic compound citrulline is an α-amino acid. [2] Its name is derived from citrullus, the Latin word for watermelon.Although named and described by gastroenterologists since the late 19th century, it was first isolated from watermelon in 1914 by Japanese researchers Yatarō Koga (古賀彌太郎) and Ryō Ōtake (大嶽了) [3] [4] and further codified by Mitsunori Wada of Tokyo ...
Homocitrulline has been suggested as a confounding antigen for rheumatoid arthritis antibodies targeting citrullinated proteins/peptides. [1] Antibodies binding to homocitrulline-containing sequences have been found in rheumatoid arthritis patients' sera [2] [3] More recently, it has been shown that homocitrulline-containing proteins are present in rheumatoid arthritis (RA) joints. [4]
Some cells synthesize argininosuccinic acid from citrulline and aspartic acid and use it as a precursor for arginine in the urea cycle (or citrulline-NO cycle), releasing fumarate as a by-product to enter the TCA cycle. The enzyme that catalyzes the reaction is argininosuccinate synthetase. [3] [4]
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Argininosuccinate synthase or synthetase (ASS; EC 6.3.4.5) is an enzyme that catalyzes the synthesis of argininosuccinate from citrulline and aspartate. In humans, argininosuccinate synthase is encoded by the ASS gene located on chromosome 9. ASS is responsible for the third step of the urea cycle and one of the reactions of the citrulline-NO ...
The structure of the molecule of urea is O=C(−NH 2) 2.The urea molecule is planar when in a solid crystal because of sp 2 hybridization of the N orbitals. [8] [9] It is non-planar with C 2 symmetry when in the gas phase [10] or in aqueous solution, [9] with C–N–H and H–N–H bond angles that are intermediate between the trigonal planar angle of 120° and the tetrahedral angle of 109.5°.
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L-Ornithine is one of the products of the action of the enzyme arginase on L-arginine, creating urea. Therefore, ornithine is a central part of the urea cycle, which allows for the disposal of excess nitrogen. Ornithine is recycled and, in a manner, is a catalyst. First, ammonia is converted into carbamoyl phosphate (H 2 NC(O)OPO 2−
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