PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 32817466-4 2020 Comparison of NgBR/DHDDS with homodimeric cis-PTase structures leads to a model where the elongating isoprene chain extends beyond the enzyme"s active site tunnel, and an insert within the alpha3 helix helps to stabilize this energetically unfavorable state to enable long-chain synthesis to occur. isoprene 101-109 NUS1 dehydrodolichyl diphosphate synthase subunit Homo sapiens 14-18