6LNW

Crystal structure of accessory secretory protein 1,2 and 3 in Streptococcus pneumoniae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


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Literature

Structural and functional insights into the Asp1/2/3 complex mediated secretion of pneumococcal serine-rich repeat protein PsrP.

Guo, C.Feng, Z.Zuo, G.Jiang, Y.L.Zhou, C.Z.Chen, Y.Hou, W.T.

(2020) Biochem Biophys Res Commun 524: 784-790

  • DOI: 10.1016/j.bbrc.2020.01.146
  • Primary Citation of Related Structures:  
    6LNW

  • PubMed Abstract: 
  • The accessory sec system consisting of seven conserved components is commonly distributed among pathogenic Gram-positive bacteria for the secretion of serine-rich-repeat proteins (SRRPs). Asp1/2/3 protein complex in the system is responsible for both the O-acetylation of GlcNAc and delivering SRRPs to SecA2 ...

    The accessory sec system consisting of seven conserved components is commonly distributed among pathogenic Gram-positive bacteria for the secretion of serine-rich-repeat proteins (SRRPs). Asp1/2/3 protein complex in the system is responsible for both the O-acetylation of GlcNAc and delivering SRRPs to SecA2. However, the molecular mechanism of how Asp1/2/3 transport SRRPs remains unknown. Here, we report the complex structure of Asp1/2/3 from Streptococcus pneumoniae at 2.9 Å. Further functional assays indicated that Asp1/2/3 can stimulate the ATPase activity of SecA2. In addition, the deletion of asp1/2/3 gene resulted in the accumulation of a secreted version of PsrP with an altered glycoform in protoplast fraction of the mutant cell, which suggested the modification/transport coupling of the substrate. Altogether, these findings not only provide structural basis for further investigations on the transport process of SRRPs, but also uncover the indispensable role of Asp1/2/3 in the accessory sec system.


    Organizational Affiliation

    Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China. Electronic address: todvince@mail.ustc.edu.cn.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Accessory secretory protein Asp1A526Streptococcus pneumoniae TIGR4Mutation(s): 0 
Gene Names: SP_1762
UniProt
Find proteins for A0A0H2UR88 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2UR88 
Go to UniProtKB:  A0A0H2UR88
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Accessory secretory protein Asp2B511Streptococcus pneumoniae TIGR4Mutation(s): 0 
Gene Names: SP_1761
UniProt
Find proteins for A0A0H2URA6 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2URA6 
Go to UniProtKB:  A0A0H2URA6
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Accessory secretory protein Asp3C154Streptococcus pneumoniae TIGR4Mutation(s): 0 
Gene Names: SP_1760
UniProt
Find proteins for A0A0H2URJ0 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2URJ0 
Go to UniProtKB:  A0A0H2URJ0
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.158α = 90
b = 101.158β = 90
c = 196.851γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31770787
National Natural Science Foundation of China (NSFC)China31670732

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-26
    Type: Initial release
  • Version 1.1: 2020-03-25
    Changes: Database references