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 

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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