Proteins and Enzymes

ID #2331

I'm still unsure about what Prof Mehrtens said when he explained to someone in lecture 5 about how sometimes on the amino acid the amino group is shown as NH2 and sometimes it is shown as NH3+? Could someone explain it to me?

The amino group of the amino acid can be written with the charge like it would be if you found it under physiological conditions (NH3+), or it can be written without the charge (NH2) like it typically is drawn in textbooks. Either way still is referring to the amino group of an amino acid. The reason that there is a difference is the same reason that he said basic amino acids and acidic amino acids carry charges at physiological conditions. 

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