Peptide aminonitrogen transport by the lactating rat mammary gland
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چکیده
منابع مشابه
Peptide Transport and Metabolism by the Lactating Mammary Gland.
There has been considerable interest in the metabolism of small peptides by the lactating mammary gland since the discovery that plasma-derived peptides may be an important source of amino nitrogen for milk protein synthesis (1). The uptake of certain essential amino acids is less than their output in milk protein, and evidence suggests that the shortfall is made up from peptide-derived amino a...
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Because vitamin A in milk is largely present as esterified retinol while blood plasma predominantly contains unesterified retinol, experiments were conducted to determine whether membranes from the lactating mammary gland are able to synthesize retinyl esters in vitro. When microsomes from rats lactating for 7 to 14 days were incubated with [(3)H]retinol dispersed in dimethylsulfoxide, some [(3...
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We have studied the specificity of the acyl-CoA:diglyceride acyltransferase reaction in lactating rat mammary gland to provide a rational explanation at the enzyme level for the nonrandom distribution of fatty acids in milk fat triglycerides. Acyl-CoA:diglyceride acyltransferase activity was measured using various diglyceride and radioactive acyl-CoA substrates; products were identified as trig...
متن کاملFatty Acid Synthetase from Lactating Rat Mammary Gland
Fatty acid synthetase has been purified from lactating rat mammary gland and some of its physical and kinetic properties studied. This synthetase is an asymmetrical multienzyme complex of molecular weight 478,000 which readily dissociates into approximately half-molecular weight subunits. The sedimentation and diffusion coefficients of the native enzyme are 12.9 set X lo-l3 and 2.56 cm2 se@ X l...
متن کاملFatty acid synthase from lactating rat mammary gland.
Homogeneous preparations of fatty acid synthetase from mammary glands of lactating rats were used to prepare an antiserum and a y-globulin fraction was isolated from the antiserum. The antiserum and the y-globulin fraction were shown to be specific against the fatty acid synthetase multienzyme complex. Addition of the y-globulin to homogenate fractions of lactating rat mammary glsnds, resulted ...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Biomembranes
سال: 1998
ISSN: 0005-2736
DOI: 10.1016/s0005-2736(98)00107-2