Understanding the Binding of Kininogen at Different pH Levels

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SUMMARY

The binding of kininogen is less sensitive to physiological pH changes primarily due to the pKa of the lysine side chain, which is significantly higher than that of histidine, allowing it to remain positively charged at elevated pH levels. The correct answer to the posed question is A), as confirmed by the discussion participants who referenced specific pKa values. This understanding is crucial for comprehending the biochemical interactions involving kininogen and its binding properties across varying pH levels.

PREREQUISITES
  • Understanding of amino acid side chain pKa values
  • Knowledge of biochemical interactions involving kininogen
  • Familiarity with the concept of covalent interactions in biochemistry
  • Basic principles of pH and its effect on protein structure
NEXT STEPS
  • Research the pKa values of various amino acids, focusing on lysine and histidine
  • Study the role of kininogen in physiological processes and its binding mechanisms
  • Explore covalent interactions in biochemistry, particularly involving heparin
  • Investigate the effects of pH on protein structure and function
USEFUL FOR

Biochemists, molecular biologists, and students studying protein interactions and the effects of pH on biochemical processes will benefit from this discussion.

Mr_Bio
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Homework Statement



Why is the binding of kininogen less sensitive to physiological pH changes?

A) the pKa of the lysine side chain is much higher than that of HIS so it remains positive at higher pH
B) Lysine forms a covalent interaction with heparin
C) The lysine side chain is positively charged over the ppH range 0-14.
D) the pKa of the lysine side chain is much lower than that of HIS so it remains positive at higher pH

Homework Equations





The Attempt at a Solution



I'm stuck on this question -- I believe the answer is A) as I looked up the pkAs and this seems to be true. However, I'm not sure if there is a better answer or not.
 
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It's funny that I started to read this as 4 full reasons why, and I had a revelation at answer A, so I didn't even read the others. Yes, it's A. And I'm assuming that you don't need this answer anymore (or your homework is 7 years late-- edit: to the day!), but hopefully this helps others.
 

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