<prompt> The amino acid that produces kinks in the b pleated structure of proteins isGlycineSerineProlineAlanine  <response>: Proline and 4hydroxy proline confer strength to fibrous proteins like collagen,elastin,keratin etc. in their beta pleated structureRef: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 244 