3D model of PSI-LHCI supercomplexes from chlamydomonas reinhardtii

Venkateswarlu Yadavalli, Chandramouli Malleda, Rajagopal Subramanyam

Research output: Chapter in Book/Report/Conference proceedingChapter


The function of Photosystem I (PSI) is catalyzing one of the initial steps in driving oxygenic photosynthesis in cyanobacteria, algae and higher plants. The recent crystallographic model at 3.3 Å resolution represents the most complete plant PSI structure. The Chlamydomonas reinhardtii PSI-LHCI supercomplex structure is not known since it contains a unique structure having additional subunits of light harvesting complex I (LHCI). We have modeled PSI core and LHCI in order to elucidate the structure of PSI-LHCI supercomplexes of C. reinhardtii. Most of the core subunits are homologous to the higher plants except PsaO and now it has been modeled based on threading. All core subunits were located similarly like pea structure however, PsaO, a new subunit is closely located to the PsaH, PsaI and PsaL subunits. The location of PsaO subunit at this position may suggest that it may be involved in state transition mechanism in C. reinhardtii. From our model, it indicates that there are non-covalent strong inter protein-protein relationship, especially from PSI core to LHCI. Our 3D model may give the structural information for better understanding of PSI-LHCI arrangement and its physiological role in C. reinhardtii as well as other algae, where it serves many biotechnological applications.

Original languageEnglish
Title of host publicationAdvanced Topics in Science and Technology in China
Number of pages4
Publication statusPublished - Jan 1 2013

Publication series

NameAdvanced Topics in Science and Technology in China
ISSN (Print)1995-6819
ISSN (Electronic)1995-6827



  • 3D Model
  • C. Reinhardtii
  • Supercomplex

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Engineering(all)
  • General

Cite this

Yadavalli, V., Malleda, C., & Subramanyam, R. (2013). 3D model of PSI-LHCI supercomplexes from chlamydomonas reinhardtii. In Advanced Topics in Science and Technology in China (pp. 17-20). (Advanced Topics in Science and Technology in China). Springer. https://doi.org/10.1007/978-3-642-32034-7_4