[qw098]

When drawing a polypeptide, does one usually draw the carboxy terminus to the right or left!? What's standard convention?

[Yggdrasil]

Usually peptides are drawn with N-terminus on the left and C-terminus on the right.

[qw098]

Ok, great that's what I thought.

Then how come then when the serine protease mechanism is drawn... the N-terminus is drawn on the right and the C-terminus on the left?

[Yggdrasil]

Sometimes if it is more convenient (e.g. showing the peptide bound to something else), you will see peptides drawn in different orientations.  But if you are just showing the peptide alone and there are not any other considerations, you should generally draw the peptide from N- to C- terminus.

[qw098]

Awesome, thanks a lot!