Abstract:
:Analysis of inner and outer pea (Pisum sativum var. Laxtons Progress No. 9) chloroplast envelope membranes by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that, although the two membranes have distinct polypeptide compositions, there are several comigrating polypeptides in the two membrane fractions. To determine whether these comigrating polypeptides were identical by criteria other than molecular weight, the membrane proteins were analyzed by two-dimensional gel electrophoresis. The results demonstrated that an 86-kilodalton band found in both membranes represents at least two different polypeptides, one an outer membrane protein and the other an inner membrane protein. Several other polypeptide bands found in both membranes appear to be of stromal origin. Two of these polypeptides were shown to be the large and small subunits of ribulose 1,5-bisphosphate carboxylase. The large subunit was identified by two-dimensional electrophoresis of envelope membranes to which stromal proteins were added. Additionally, the large and small subunits of ribulose 1,5-bisphosphate carboxylase were immunologically identified using an electrophoretic transfer procedure coupled with an enzyme-linked immunosorbent assay. Various treatments, including sonication, resulted in no significant loss of the stromal polypeptides from the outer envelope membranes. Based on these results, it is suggested that the stromal proteins are not simply bound to the outer surface of the vesicles.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Werner-Washburne M,Cline K,Keegstra Kdoi
10.1104/pp.73.3.569subject
Has Abstractpub_date
1983-11-01 00:00:00pages
569-75issue
3eissn
0032-0889issn
1532-2548journal_volume
73pub_type
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