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CHLOROPHYLL b : AN INTEGRAL COMPONENT OF PHOTOSYSTEM I OF HIGHER PLANT CHLOROPLASTS

CHLOROPHYLL b : AN INTEGRAL COMPONENT OF PHOTOSYSTEM I OF HIGHER PLANT CHLOROPLASTS Abstract— An undissociated photosystem I complex may be isolated from spinach thylakoids by mild gel electrophoresis (CP1a) or Triton X‐100. CP1a has a Chl a/b ratio of 11 and a Chl/P700 ratio of 120. while the Triton X‐100 PS I complex (Chl a/b ratio of 5.9) has a larger antenna unit size (Chl/P700 ratio of 180). None of the Chl a/b‐proteins of the main light‐harvesting complex (apoproteins of 30–27 kD) are present in CP1a, and they account for less than 10% of the total chlorophyll in the Triton X‐100 PS I complex. Instead, these PS I complexes have specific, but as yet little characterized, Chi a/b‐proteins (apoproteins in the 26–21 kD range). With both PS I complexes, Chi b transfers light excitation to the 735 nm low temperature fluorescence band characteristic of photosystem I. We suggest that Chi b is an integral but minor component of photosystem I. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Photochemistry & Photobiology Wiley

CHLOROPHYLL b : AN INTEGRAL COMPONENT OF PHOTOSYSTEM I OF HIGHER PLANT CHLOROPLASTS

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References (19)

Publisher
Wiley
Copyright
Copyright © 1983 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0031-8655
eISSN
1751-1097
DOI
10.1111/j.1751-1097.1983.tb03863.x
Publisher site
See Article on Publisher Site

Abstract

Abstract— An undissociated photosystem I complex may be isolated from spinach thylakoids by mild gel electrophoresis (CP1a) or Triton X‐100. CP1a has a Chl a/b ratio of 11 and a Chl/P700 ratio of 120. while the Triton X‐100 PS I complex (Chl a/b ratio of 5.9) has a larger antenna unit size (Chl/P700 ratio of 180). None of the Chl a/b‐proteins of the main light‐harvesting complex (apoproteins of 30–27 kD) are present in CP1a, and they account for less than 10% of the total chlorophyll in the Triton X‐100 PS I complex. Instead, these PS I complexes have specific, but as yet little characterized, Chi a/b‐proteins (apoproteins in the 26–21 kD range). With both PS I complexes, Chi b transfers light excitation to the 735 nm low temperature fluorescence band characteristic of photosystem I. We suggest that Chi b is an integral but minor component of photosystem I.

Journal

Photochemistry & Photobiology – Wiley

Published: Aug 1, 1983

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