7ZAL image
Entry Detail
PDB ID:
7ZAL
Title:
FNIP family proteins from Cafeteria roenbergensis virus (CroV): leucine-rich repeats with novel structural features
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2022-03-22
Release Date:
2022-08-24
Method Details:
Experimental Method:
Resolution:
2.73 Å
R-Value Free:
0.26
R-Value Work:
0.21
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Crov539
Chain IDs:A (auth: AAA), B (auth: BBB), C (auth: CCC), D (auth: DDD), E (auth: EEE), F (auth: FFF)
Chain Length:292
Number of Molecules:6
Biological Source:Cafeteria roenbergensis virus
Primary Citation
Crystal structures of FNIP/FGxxFN motif-containing leucine-rich repeat proteins.
Sci Rep 12 16430 16430 (2022)
PMID: 36180492 DOI: 10.1038/s41598-022-20758-8

Abstact

The Cafeteria roenbergensis virus (Crov), Dictyostelium, and other species encode a large family of leucine-rich repeat (LRR) proteins with FGxxFN motifs. We determined the structures of two of them and observed several unique structural features that set them aside from previously characterized LRR family members. Crov588 comprises 25 regular repeats with a LxxLxFGxxFNQxIxENVLPxx consensus, forming a unique closed circular repeat structure. Novel features include a repositioning of a conserved asparagine at the middle of the repeat, a double phenylalanine spine that generates an alternate core packing arrangement, and a histidine/tyrosine ladder on the concave surface. Crov539 is smaller, comprising 12 repeats of a similar LxxLxFGxxFNQPIExVxW/LPxx consensus and forming an unusual cap-swapped dimer structure. The phenylalanine spine of Crov539 is supplemented with a tryptophan spine, while a hydrophobic isoleucine-rich patch is found on the central concave surface. We present a detailed analysis of the structures of Crov588 and Crov539 and compare them to related repeat proteins and other LRR classes.

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