Protein–protein interactions among enzymes of starch biosynthesis in high-amylose barley genotypes reveal differential roles of heteromeric enzyme complexes in the synthesis of A and B granules

•Starch biosynthetic enzymes form heteromeric complexes in barley amyloplasts.•Interaction between SSI, SSII and SBE isozymes was phosphorylation dependent.•Loss of SBEIIa or SBEIIb led to complexes containing SBEI and PHO1.•Deletion of SSIIa caused loss of other enzymes from starch granules.•SBEI a...

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