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Kaplan Qbank USMLE



Author5 Posts
  #1

NAD and NADPH ,both are Niacin derivatives .What is the difference in their action and Function?

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FA is just a good revision book.It is not a "real" learning tool.

  #2

NAD - role in ATP production (ETC)
NADPH - role in HMP shunt.

i think u want some thing more. grin

  #3

NADPH - fatty acid synthesis

  #4

u have to compare nad+ with nadp+ and nadh with nadph: from lippincott:

"nadp+ differs from nad+ only by the prese3nce of a phosphate group on one of the ribose units. This seemingly small change allows nadp+ to interact with specific enzymes. In the steady state the ratio nadp+/nadph in the cytosol of hepatocytes is 0.1 which favors the use of nadph in reductive byosinthetic reactions. This contrasts with the high ratio nad+/nadh, that is 1000 in the cytosol of hepatocytes which favors an oxidative role for nad+"

USES OF NADP+/NADPH:

-reductive byointhesis

-reductionm of hydrogen peroxide: glutathione reductase use nadph as reductive agent (remember g6pd deficiency!)

-cytochrome p450 monoxygenase system

-phagocytosis by white cells

-synthesis of nitric oxide (substrate of nitric oxid synthase are arginine, oxygen and nadph)


  #5

whats ur say leopard??







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