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SCAN0012 - K“ fax mummy Ashwm’n rim[avian mow u...

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Unformatted text preview: K“. fax mummy Ashwm’n rim [avian ; mow u RMMaMDrm-w Charge-Charge Interactions . Electrostatic interactions between two charged particles (Ion pairing) - Is the strongest type of non-covalent forces - Can extend over greater distances than other forces - Charge repulsion occurs between similarly charged groups - Weakened by water Na+c Faun : 1 Mammal marrow“. in mm exam Krmsmmm) Noncovalent forces There are four major types of noncovalent forces: (1) Charge-charge interactions (2) Hydrogen bonds (3) Van der Waals forces (4) Hydrophobic interactions They are important in: Stabilization of proteins and nucleic acids Recognition of one biopolymer by another Binding of reactants to enzymes Types of attractive charged interactions - Salt bridges — attractions bctwccn oppositely— charged functional groups in proteins. - [on pairing - a salt bridge buried in the hydrophobic interior of a protein is stronger than one on the surface (no water nearby) Hydrogen Bonds - Second strongest noncovalent interactions — but 30—100 times weaker than covalent interactions. - H atom bonded to N, O, S can hydrogen bond to another electronegative atom (~0.2 nm distance) - Total distance between the two electronegative atoms is ~O.27 to 0.30 nm - In aqueous solution, water can H-bond to exposed functional groups on biological molecules -Water-p1'0tcin, protein-protein, DNA-DN A, ect ...
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