These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Characteristics of prolinase against various iminodipeptides in erythrocyte lysates from a normal human and a patient with prolidase deficiency.
    Author: Wang W, Liu G, Yamashita K, Manabe M, Kodama H.
    Journal: Clin Chem Lab Med; 2004; 42(10):1102-8. PubMed ID: 15552267.
    Abstract:
    The effect of various amino acids and MnCl2 on prolinase activity in erythrocyte lysates from a healthy individual and a patient with prolidase deficiency was investigated. A concentration of 0.1 mM MnCl2 increased prolinase activity in normal erythrocytes against pro-gly, pro-glu, pro-leu, pro-ser and pro-phe, but inhibited that against pro-ala, pro-val, pro-met and pro-asp. However, prolinase activity against these iminodipeptides was enhanced by pre-incubation with glycine, independent of MnCl2. The same studies on erythrocytes from a prolidase-deficient patient showed almost the same results as the normal control, except that prolinase activity against pro-gly and pro-ser was slightly inhibited by adding 0.1 mM MnCl2. Some amino acids, glutamic acid and glutamine, slightly enhanced prolinase activity against pro-gly in erythrocytes from both the normal control and the prolidase-deficient patient, but N-acetyl-L-glutamic acid, gamma-aminobutyric acid (GABA) and beta-alanine showed no effect. Branched amino acids, L-valine, L-leucine and L-isoleucine strongly inhibited the prolinase activity against pro-gly. However, conversely, their isomers, D-valine, D-leucine and D-isoleucine, enhanced it. The kinetics of prolinase activity in the erythrocytes from both the normal individual and the prolidasedeficient patient were also studied. Their Km values were changed by adding glycine or 0.1 mM MnCl2, but Vmax values were almost the same.
    [Abstract] [Full Text] [Related] [New Search]