Two interacting coiled-coil proteins, WEB1 and PMI2, maintain the chloroplast photorelocation movement velocity in Arabidopsis.

ABSTRACT: Chloroplasts move toward weak light (accumulation response) and away from strong light (avoidance response). The fast and accurate movement of chloroplasts in response to ambient light conditions is essential for efficient photosynthesis and photodamage prevention in chloroplasts. Here, we report that two Arabidopsis mutants, weak chloroplast movement under blue light 1 (web1) and web2, are defective in both the avoidance and the accumulation responses. Map-based cloning revealed that both genes encode coiled-coil proteins and that WEB2 is identical to the plastid movement impaired 2 (PMI2) gene. The velocities of chloroplast movement in web1 and pmi2 were approximately threefold lower than that in the wild type. Defects in the avoidance response of web1 and pmi2 were suppressed by mutatio

SUBMITTER: Kodama Y 

PROVIDER: S-EPMC2984159 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature