Molecular Weight of Beef Heart Lactate Dehydrogenase

I.U.B.: 1.1.one.27

C.A.S.: 9001-sixty-9

L-Lactate:NAD⁺ oxidoreductase

Enzymatic Reaction(image will open in a new window)

Lactate dehydrogenase (LDH) catalyzes the following reaction:

Man LDH has been reported on by Ringoir and Plum (1975), Emes et al. (1974), Markel and Janich (1974), McQueen (1974), Burd and Usatequi-Gomez (1973), and McKee et al. (1972); that from pig by Hinz and Jaenicke (1975), Bloxham et al. (1975), Chen and Engel (1975), Eventoff et al. (1974), Jaenicke (1974), Whitaker et al. (1974), Holbrook and Ingram (1973), Holbrook and Stinson (1973), and Stinson and Holbrook (1973). Adams et al. (1973) and Taylor et al. (1973) accept reported on dogfish LDH, and Carlotti et al. (1974) and Ryan and Vestling (1974) on that of rat liver and hepatomas. Fritz et al. (1973) study on dissimilar rates of tissue turnover of the rat isozymes. Kabura and Konvich (1972) extracted LDH isozymes from mouse brain. Ehmann and Hultin (1973) studied craven breast LDH M5. Eby et al. (1973) report on frog LDH and Lim et al. (1975) on that from salmonid fish. Long and Kaplan (1973) report on horseshoe crab and sea worm LDH. That from potatoes has been studied by Rothe (1974) and Davies and Davies (1972). Brownish et al. (1975) and Allsopp and Matthews (1975) report on the Actinomyces and Mycoplasma enzymes.

Mammalian lactate dehydrogenase (LDH) exists as v tetrameric isozymes composed of combinations of two different subunits. The isozymes differ in catalytic, concrete and immunological properties. Cahn et al. (1962) refer to the polypeptide subunits every bit "H" and "M", which combine to form two pure types of isozymes, H4 and M4, and iii hybrids, H3M, H2M2, and HM3. Blazon H4 is the well-nigh negatively charged at pH 7 and in zone electrophoresis appears nearest the anode. Subunit "H" predominates in heart muscle LDH which is geared for aerobic oxidation of pyruvate. The "Chiliad" subunit predominates in skeletal muscle and liver and is concerned more than with anaerobic metabolism and pyruvate reduction (Fritz 1965).

A sperm isozyme (isozyme x) has been characterized from testes and spermatozoa (Zinkham et al. 1964; Stambaugh and Buckley 1967). McKee et al. (1972) point at that place to be several. LDH-10 differs immunologically and enzymatically from LDH 1-5. (Spielman et al. 1973; Goldberg 1972).

LDH isozymes in the developing fetus have been reported on by Werthamer et al. (1973) and their variations with age by Gerlach and Fegler (1973). Come across likewise Ringoir and Plum (1975), Mitsutaka (1974), O'Carra et al. (1974), Glass and Doyle (1972), and Wilkinson and Walter (1972). Silverstein and Boyer (1964) compared kinetics of beef heart and rabbit muscle LDH.

LDH is of interest clinically in that the serum level of certain isozymes reflects pathological status in particular tissues.

Studies on structure, binding sites and kinetics include the following: Adams et al. (1973), Bartholmes et al. (1973), Bishop et al. (1972), Bloxham et al. (1975), Cho and Swaisgood (1974), Dudman and Zerner (1973), Ehmann and Hultin (1973), Hinz and Jaenicke (1975), Holbrook and Ingram (1973), Holbrook and Stinson (1973), Jaenicke (1974), Levetzki (1972), Low et al. (1973), Millar (1974), Mitsutaka (1974), Saito (1972), Stinson and Holbrook (1973), Tienhara and Meany (1973). Whitaker et al. (1974) report on immobilized LDH.

Characteristics of LDH from Beefiness Heart:

Molecular Weight: 35,000/subunit (Fosmire and Timasheff 1972). 136,700 ± ii,100/tetramer (Huston et al. 1972).

Composition: Vallee and Williams (1975) have reported on its subunit dissociation at depression pH. Encounter also Yang and Schwert (1972) and Gold and Segal (1965).

Extinction coefficient: =xiv.ix.

Activity: Meet Borgmann et al. (1974).

Specificity: The enzyme is specific for 50(+)lactate. Meister (1950) reports it reduces several α-keto and α,β-diketo acids but at well-nigh one-tenth the charge per unit of reduction of pyruvate.

Inhibitors: LDH is quite stable. Information technology is inactivated by iodide. Inhibition by p-mercuribenzoate is slow. Run into Schwert and Winer (1963); also Anderson et al. (1974) and Bloxham et al. (1975).

Activators: A number of organic compounds which stabilize the enzyme, such equally dimethyl sulfoxide, ethanol, and methanol, are reported by George et al. (1969). Diethylstilbestrol and several of its derivatives also stabilize the enzyme (Cohen et al. 1969).

Characteristics of LDH from Rabbit Muscle:

Molecular weight: 140,000.

Composition: Lovell and Winzor (1974) report that the tetramer dissociates completely into two dimers (molecular weight seventy,000) in acetate-chloride buffer pH 5 (weather condition without result on beef center LDH). Phosphate and pyridine nucleotides stabilize the quarternary structure of the tetramer. Phosphate has an activation event. See also Cho and Swainsgood (1973).

Activity: Reaction kinetics have been reported past Stambaugh and Post (1966) and Zewe and Fromm (1965).

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Source: https://worthington-biochem.com/LDH/default.html

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