NDLI: Transport of proteins into and across the thylakoid membrane

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Transport of proteins into and across the thylakoid membrane

Content Provider	Paperity
Author	Woolhead, Cheryl Robinson, Colin Edwards, Wayne
Abstract	The biogenesis of thylakoid proteins is a complex issue that requires the operation of at least four pathways within the chloroplast. Two of the pathways are used for soluble lumenal proteins, where the proteins bear cleavable targeting signals that are recognized by one of two distinct translocases. These pathways differ in fundamental respects. A subset of lumenal proteins are transported in an unfolded state by a typical Sec system, whereas others are transported by a novel class of translocase that appears to function primarily in the transport of fully‐folded proteins. Related protein translocases have now been shown to operate in a wide variety of bacterial species, suggesting a widespread requirement for the translocation of folded proteins across biological membranes. Numerous integral membrane proteins are also targeted into the thylakoid membrane, and these too follow at least two distinct routes. Some proteins use a signal recognition particle‐dependent pathway that requires GTP and unidentified apparatus in the thylakoid membrane. Others, however, require none of the known targeting factors and may insert spontaneously into the membrane. In this article, the rationale behind this pathway complexity is discussed in relation to the properties of the substrate proteins and the evolutionary origins of the chloroplast.
Starting Page	369
Ending Page	374
File Format	HTM / HTML
ISSN	00220957
DOI	10.1093/jexbot/51.suppl_1.369
Issue Number	1
Journal	Journal of Experimental Botany
Volume Number	51
e-ISSN	14602431
Language	English
Publisher	Oxford University Press
Publisher Date	2000-02-01
Access Restriction	Open
Subject Keyword	Proteins Sec system Translocase. Thylakoid Chloroplast
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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