1,4-DIAMINOBUTANE

Putrescine is a low-molecular-weight nitrogenous base with the systematic name 1,4-diaminobutane. It is an aliphatic diamine belonging to the group of biogenic amines (Bas). Two basic amino groups are present, which at the physiological pH of 7.4 carry a positive charge that makes them suitable for a wide range of functions in different cell types. According to some authors, putrescine also belongs, together with cadaverine, spermine, and spermidine, to polyamines (molecules containing two or more amino groups in the molecule)^[1,2]. Polyamines are found in all cell types and their presence in various kinds of foodstuffs is partly due to their endogenous origin. In humans, there are 3 common sources of putrescine: the first one is endogenous biosynthesis within their own cells, the second one includes foodstuffs (alimentary intake), and the last one is the production of putrescine by bacteria of the intestinal microflora. The largest amount of putrescine in humans is taken from food^[2]. If none of the 3 sources of putrescine becomes excessive, putrescine is used for its physiological functions and the excess is excreted by normal metabolism. However, increased intake of putrescine in food can lead to serious toxicological consequences.

Figure 1 The chemical structure of putrescine

l ,4-Diaminobutane (putrescine), spermidine, spermine, and closely related derivatives are found in a wide variety of animals, bacteria, yeasts, and plants. It is generally accepted that polyamine biosynthesis is intimately interrelated with the synthesis of nucleic acids and proteins^[3]. Polyamines are ubiquitous in biological materials, although the relative amounts of 1,4-diaminobutane, spermidine, and spermine differ markedly in different cells^{[4, 5]}. In general, prokaryotes have a higher concentration of 1,4-diaminobutane than spermidine and lack spermine. Eukaryotes usually have little 1,4-diaminobutane, and have spermine as well as spermidine.
The pathway for the biosynthesis of 1,4-diaminobutane and spermidine was first established in microorganisms and was later found to be very similar in animal cells. In bacteria, 1,4-diaminobutane may be formed either by ornithine decarboxylase or by arginine decarboxylase via agmatine^[6-8]. Both biosynthetic enzymes are normally present in Escherichia coli, although ornithine decarboxylation is usually the major pathway^[8]. Both decarboxylases have been purified from E. coli and have been shown to require pyridoxal phosphate[9-11]. These enzymes are subject to feedback inhibition and repression by 1,4-diaminobutane or spermidine[^{12, 13]}. In animal tissues amines are derived by decarboxylation of ornithine, rather than by decarboxylation of arginine^{[14, 15]}. Purification of ornithine decarboxylase has been hindered by the very low enzyme activity normally present. However, as discussed in the section on the role of polyamines in growth, ornithine decarboxylase levels increase dramatically after a variety of stimuli, and the enzyme has been purified to apparent homogeneity from regenerating liver^[17] and from the livers of rats treated with thioacetamide[18]. Pyridoxal phosphate appears to be a required cofactor^{[16, 19]}.

Putrescine fulfills important physiological functions in a wide variety of living cells. This BA shows many physiological functions and it is a precursor in the synthesis of other polyamines (spermine and spermidine). Putrescine is classified as a physiologic amine. Physiological functions of putrescine and other polyamines are related to their polycationic nature, which determines interactions with negatively charged molecules such as DNA, RNA, proteins, phospholipids^[20]. Newer studies show that putrescine, along with other polyamines and phosphate ions, forms nuclear aggregates of polyamines in the cell nuclei, which are responsible for the abovementioned interactions and affect the 3-dimensional structure of DNA^[21]. These interactions are related to the regulation of the structure of nucleic acids and protein synthesis^{[22, 23]}.
Putrescine, along with other polyamines, binds to membrane structures such as phospholipids, mainly in erythrocytes. This polyamine may lead to a decrease in membrane fluidity but also to increased resistance to fragmentation due to stabilization of the membrane skeleton^{[24, 25]}. It has also been found that apart from the membrane stabilization and the effect on the synthesis of nucleic acids and proteins, polyamines are involved in the removal of free radicals[26]. In many mammals, they play an important role as luminal growth factors for intestinal maturation and growth^{[27, 28]} and can play a significant role in the prevention of food allergies^[29]. In mammals, polyamines have direct effects on several ion channels and receptors, resulting in the regulation of Ca2+, Na+, and K+ homeostasis^{[30, 31]}.

Putrescine is used as a precursor in many biological systems and synthon for amido-ureas. It is involved in the synthesis of nylon 46 by reacting with adipic acid^[32].

With respect to important physiological functions, it is clear that disruption of the normal balance due to increased intake of putrescine from food can have serious toxicological consequences. Although the toxic effects of putrescine are significantly lower than that of histamine or tyramine, there are many serious secondary effects. Diamines such as putrescine have a very important role in alimentary poisoning as they can enhance and potentiate the toxic effect of histamine, tyramine, and phenylethylamine by interacting with enzymes that metabolize these BAs^[33]. For example, experiments on guinea pigs and rats revealed that putrescine potentiates histamine toxicity up to 10 times^{[34, 35]}. Putrescine enhances histamine toxicity by inhibiting enzymes oxidizing histamine diaminooxidase(DAO; EC 1.4.3.6) and histamine N-methyltransferase (NMT; EC 2.1.1.8)^[36-38]. Moreover, from a toxicological point of view, a serious aspect of putrescine occurrence in foodstuffs is the possibility of forming carcinogenic nitrosamines. Putrescine can form carcinogenic nitrosamines by the reaction with nitrites^{[39, 40]}.

In addition to the toxic effects, the occurrence of putrescine in foodstuffs leads to undesirable organoleptic properties and adversely affects the taste and aroma of food^[41], for example, in shrimps, it is perceptible at concentrations of 3 mg/kg^[42]. Increased occurrence of putrescine indicates food spoilage caused by microbial activity and it is also the main BA that indicates spoiled meat. The amount of putrescine, histamine, and cadaverine shows the freshness of meat and is defined as biogenic amines index (BAI)^[43].

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colourless liquid

GABA precursor in many biological systems and synthon for amido-ureas.

A GABA precursor in many biological systems.

1,4-Diaminobutane is used as a precursor in many biological systems and synthon for amido-ureas. It is involved in the synthesis of nylon 46 by reacting with adipic acid.

ChEBI: A four-carbon alkane-alpha,omega-diamine. It is obtained by the breakdown of amino acids and is responsible for the foul odour of putrefying flesh.

Poison by subcutaneous, intravenous, and rectal routes. Moderately toxic by ingestion. An experimental teratogen. Human mutation data reported. When heated to decomposition it emits toxic fumes of NOx. See also 1,3-BUTANEDIAMINE and AMINES.