Abstract:
:The soluble bean leaf auxin-binding protein (ABP) has a high affinity for a range of auxins including indole-3-acetic acid (IAA), alpha-napthaleneacetic acid, phenylacetic acid, 2,4,5-trichlorophenoxyacetic acid, and structurally related auxins. A large number of nonauxin compounds that are nevertheless structurally related to auxins do not displace IAA from bean ABP. Bean ABP has a high affinity for auxin transport inhibitors and antiauxins. The specificity of pea ABP for representative auxins is similar to that found for bean ABP. The bean ABP auxin binding site is similar to the corn endoplasmic reticulum auxin-binding sites in specificity for auxins and sensitivity to thiol reagents and azide. Qualitative similarities between the ligand specificity of bean ABP and the specificity of auxin-induced bean leaf hyponasty provide further evidence, albeit circumstantial, that ABP (ribulose 1,5-bisphosphate carboxylase) can bind auxins in vivo. The high incidence of ABP in bean leaves and the high affinity of this protein for auxins and auxin transport inhibitors suggest possible functions for ABP in auxin transport and/or auxin sequestration.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Wardrop AJ,Polya GMdoi
10.1104/pp.66.1.112subject
Has Abstractpub_date
1980-07-01 00:00:00pages
112-8issue
1eissn
0032-0889issn
1532-2548journal_volume
66pub_type
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