This motif is found in many proteins, typically as either a repeating unit that forms a ring (as in this case), or in less-regular structures. The two beta-strands are parallel, and are connected by the alpha-helix. The helix packs tightly against the beta-strands as can be seen in the space-filling view.

Crystal structure of Triosephosphate isomerase from Mycobacterium tuberculosis
Abendroth, J., Staker, B.
(2009, previously unpublished)

Increasing the structural coverage of tuberculosis drug targets.
Baugh L, et al.,
Tuberculosis (Edinburgh, Scotland). 2015 Mar;95(2):142-8.

3gvg (PDB)