Starch-debranching enzyme involved in amylopectin biosynthesis in endosperm. Functions by removing excess branches or improper branches that interfere with the formation of double helices of the cluster chains of amylopectin and crystallization of starch (PubMed:10517831, PubMed:15618430, PubMed:16953433, PubMed:21436381). Works as ISA1 homooligomer or together with ISA2 as heterooligomer. The heterooligomer ISA1 and ISA2 possesses higher affinity than the ISA1 homooligomer for various branched polyglucans in vitro, but no marked differences exist in chain preferences for debranching of amylopectin and phytoglycogen between these forms (PubMed:16953433, PubMed:21436381).

Belongs to the glycosyl hydrolase 13 family.

803 amino acids

MASLPHCLSARPLVVAAAPGRPGPGPGPWLRGGARRRNAAFSAGNAGRRVGLRRSVASAVEVGVGEDEEEGVEEEEEEVEAVVMPERYALGGACRVLAGMPAPLGATALDGGVNFAVYSAGASAASLCLFTPDDLEADEVTEEVPLDPLFNRTGNVWHVFIEGELHNMLYGYRFDGMFAPHCGQYFDVSNVVVDPYAKAVISRGEYGVPGPGGDCWPQMAGMIPLPYSTFDWQGDLPLRYPQKDLVIYEMHLRGFTKHSSSNVEHPGTYIGAISKLDYLKELGVNCVELMPCHEFNELEYFSCSSKMNFWGYSTINFFSPMIRYSSGGIRNCGRDAINEFKTFVREAHKRGIEVIMDVVFNHTAEGNEKGPILSFRGIDNSTYYMLAPKGEFYNYSGCGNTFNCNHPVVREFIVDCLRYWVTEMHVDGFRFDLASIMTRGCSLWDPVNVYGSPVEGDMTTTGTPLATPPLIDMISNDPILGDVKLIAEAWDAGGLYQVGQFPHWKIWSEWNGKYRDIVRQFIKGTDGFAGGFAECLCGSPHLYQAGGRKPWHSINFVCAHDGFTLADLVTYNKKYNSSNGEDNRDGENHNLSWNCGEEGEFAGLSVKRLRKRQMRNFFVSLMVSQGVPMFYMGDEYGHTKGGNNNTYCHDHYVNYFRWDKKEESSDLQRFCSLMTKFRKQCESLGLADFPTAQRLHWHGHQPGKPDWSETSRFVAFSTKDETKGEIYVAFNASHLPAVVGLPERPGYRWEPLVDTGKPAPYDFLTDDLPDRAHAVHLFSHFLNSNLYPMLSYSSIILELQPDD

89.7 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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