310螺旋

3₁₀螺旋是一類蛋白質和多肽中較少見的二級結構。

丙氨酸殘基組成的3₁₀螺旋的微觀結構側視圖：紫色為殘基之間形成的氫鍵，其氫氧原子之間的距離為1.83 Å（183 pm）。The protein chain runs upwards, i.e., its N-terminus is at the bottom and its C-terminus at the top of the figure. Note that the sidechains point slightly downwards, i.e., towards the N-terminus.

參考文獻

• Pauling L, Corey RB and Branson HR. (1951) "The Structure of Proteins: Two Hydrogen-Bonded Helical Configurations of the Polypeptide Chain", Proc. Nat. Acad. Sci. Wash., 37, 205.