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Chickpea is a crop that is known as a source of high-quality proteins. CL-AI, which belongs to the 11S globulin and cupin superfamily, was initially identified in chickpea seeds. CL-AI has recently been shown to inhibit various types of α-amylases. To determine its molecular mechanism, the crystal structure of CL-AI was solved at a final resolution of 2.2 Å. Structural analysis indicated that each asymmetric unit contains three molecules with threefold symmetry and a head-to-tail association, and each molecule is divided into an α-chain and a β-chain. CL-AI has high structural similarity to other 11S globulins and canonical metal-dependent enzyme-related cupin proteins, whereas its stimilarity to α-amylase inhibitor from Phaseolus vulgaris is quite low. The structure presented here will provide insight into the function of CL-AI.

Supporting information

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Portable Document Format (PDF) file https://doi.org/10.1107/S2053230X22007919/yg5006sup1.pdf
Supplementary Figures.

PDB reference: Cicer arietinum 11S gloubulin, 5gyl


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