Crystal structure of limiting CO2-inducible protein LCIB

Experimental Data Snapshot

  • Resolution: 2.59 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.269 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structural insights into the LCIB protein family reveals a new group of beta-carbonic anhydrases

Jin, S.Sun, J.Wunder, T.Tang, D.Cousins, A.B.Sze, S.K.Mueller-Cajar, O.Gao, Y.G.

(2016) Proc Natl Acad Sci U S A 113: 14716-14721

  • DOI: https://doi.org/10.1073/pnas.1616294113
  • Primary Citation of Related Structures:  
    5B5X, 5B5Y, 5B5Z, 5B60, 5K5W

  • PubMed Abstract: 

    Aquatic microalgae have evolved diverse CO 2 -concentrating mechanisms (CCMs) to saturate the carboxylase with its substrate, to compensate for the slow kinetics and competing oxygenation reaction of the key photosynthetic CO 2 -fixing enzyme rubisco. The limiting CO 2 -inducible B protein (LCIB) is known to be essential for CCM function in Chlamydomonas reinhardtii To assign a function to this previously uncharacterized protein family, we purified and characterized a phylogenetically diverse set of LCIB homologs. Three of the six homologs are functional carbonic anhydrases (CAs). We determined the crystal structures of LCIB and limiting CO 2 -inducible C protein (LCIC) from C. reinhardtii and a CA-functional homolog from Phaeodactylum tricornutum, all of which harbor motifs bearing close resemblance to the active site of canonical β-CAs. Our results identify the LCIB family as a previously unidentified group of β-CAs, and provide a biochemical foundation for their function in the microalgal CCMs.

  • Organizational Affiliation

    School of Biological Sciences, Nanyang Technological University, Singapore 637551.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
limiting CO2-inducible protein LCIB
A, B
297Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: Pmp1LCIB
Find proteins for Q0ZAI6 (Chlamydomonas reinhardtii)
Explore Q0ZAI6 
Go to UniProtKB:  Q0ZAI6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ0ZAI6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.59 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.269 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.835α = 90
b = 80.218β = 90
c = 143.753γ = 90
Software Package:
Software NamePurpose
SCALAdata reduction
SCALAdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Singapore National Research FoundationSingaporeNRF-RF2009-RF001-267

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-07
    Type: Initial release
  • Version 1.1: 2017-01-18
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Data collection
  • Version 1.3: 2023-11-08
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description