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16  structures 385  species 0  interactions 7772  sequences 359  architectures

Family: zf-B_box (PF00643)

Summary: B-box zinc finger

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B-box zinc finger Edit Wikipedia article

zf-B_box
PDB 1fre EBI.jpg
Structure of the xnf7 B-box, developmental protein
Identifiers
Symbol zf-B_box
Pfam PF00643
InterPro IPR000315
PROSITE PDOC50015
SCOP 1fre
SUPERFAMILY 1fre

In molecular biology the B-box-type zinc finger domain is a short protein domain of around 40 amino acid residues in length. B-box zinc fingers can be divided into two groups, where types 1 and 2 B-box domains differ in their consensus sequence and in the spacing of the 7-8 zinc-binding residues. Several proteins contain both types 1 and 2 B-boxes, suggesting some level of cooperativity between these two domains. B-box domains are found in over 1500 proteins from a variety of organisms. They are found in TRIM (tripartite motif) proteins that consist of an N-terminal RING finger (originally called an A-box), followed by 1-2 B-box domains and a coiled-coil domain (also called RBCC for Ring, B-box, Coiled-Coil). TRIM proteins contain a type 2 B-box domain, and may also contain a type 1 B-box. In proteins that do not contain RING or coiled-coil domains, the B-box domain is primarily type 2. Many type 2 B-box proteins are involved in ubiquitinylation. Proteins containing a B-box zinc finger domain include transcription factors, ribonucleoproteins and proto-oncoproteins; for example, MID1, MID2, TRIM9, TNL, TRIM36, TRIM63, TRIFIC, NCL1 and CONSTANS-like proteins.[1]

The microtubule-associated E3 ligase MID1 (EC) contains a type 1 B-box zinc finger domain. MID1 specifically binds Alpha-4, which in turn recruits the catalytic subunit of phosphatase 2A (PP2Ac). This complex is required for targeting of PP2Ac for proteasome-mediated degradation. The MID1 B-box coordinates two zinc ions and adopts a beta/beta/alpha cross-brace structure similar to that of ZZ, PHD, RING and FYVE zinc fingers.[2][3]

Prokaryotic homologs of the domain are present in several bacterial lineages and methanogenic archaea, and often show fusions to peptidase domains such as the rhomboid-like serine peptidase, and Zn-dependent metallopeptidase. Other versions typically contain transmembrane helices and might also show fusions to domains such as DNAJ, FHA, SH3, WD40 and tetratricopeptide repeats. Together these associations suggest a role for the prokaryotic homologs of the B-box zinc finger domain in proteolytic processing, folding or stability of membrane-associated proteins. The domain architectural syntax is remarkably similar to that seen in prokaryotic homologs of the AN1 zinc finger and LIM domains.[4]

External links[edit]

References=[edit]

  1. ^ Short KM, Cox TC (March 2006). "Subclassification of the RBCC/TRIM superfamily reveals a novel motif necessary for microtubule binding". J. Biol. Chem. 281 (13): 8970–80. doi:10.1074/jbc.M512755200. PMID 16434393. 
  2. ^ Massiah MA, Matts JA, Short KM, Simmons BN, Singireddy S, Yi Z, Cox TC (May 2007). "Solution structure of the MID1 B-box2 CHC(D/C)C(2)H(2) zinc-binding domain: insights into an evolutionarily conserved RING fold". J. Mol. Biol. 369 (1): 1–10. doi:10.1016/j.jmb.2007.03.017. PMID 17428496. 
  3. ^ Massiah MA, Simmons BN, Short KM, Cox TC (April 2006). "Solution structure of the RBCC/TRIM B-box1 domain of human MID1: B-box with a RING". J. Mol. Biol. 358 (2): 532–45. doi:10.1016/j.jmb.2006.02.009. PMID 16529770. 
  4. ^ Burroughs AM, Iyer LM, Aravind L (July 2011). "Functional diversification of the RING finger and other binuclear treble clef domains in prokaryotes and the early evolution of the ubiquitin system". Mol Biosyst. 7 (1): 2261–77. doi:10.1039/C1MB05061C. PMID 21547297. 

See also[edit]

This article incorporates text from the public domain Pfam and InterPro IPR000315

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

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B-box zinc finger Provide feedback

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External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR000315

Zinc finger (Znf) domains are relatively small protein motifs which contain multiple finger-like protrusions that make tandem contacts with their target molecule. Some of these domains bind zinc, but many do not; instead binding other metals such as iron, or no metal at all. For example, some family members form salt bridges to stabilise the finger-like folds. They were first identified as a DNA-binding motif in transcription factor TFIIIA from Xenopus laevis (African clawed frog), however they are now recognised to bind DNA, RNA, protein and/or lipid substrates [PUBMED:10529348, PUBMED:15963892, PUBMED:15718139, PUBMED:17210253, PUBMED:12665246]. Their binding properties depend on the amino acid sequence of the finger domains and of the linker between fingers, as well as on the higher-order structures and the number of fingers. Znf domains are often found in clusters, where fingers can have different binding specificities. There are many superfamilies of Znf motifs, varying in both sequence and structure. They display considerable versatility in binding modes, even between members of the same class (e.g. some bind DNA, others protein), suggesting that Znf motifs are stable scaffolds that have evolved specialised functions. For example, Znf-containing proteins function in gene transcription, translation, mRNA trafficking, cytoskeleton organisation, epithelial development, cell adhesion, protein folding, chromatin remodelling and zinc sensing, to name but a few [PUBMED:11179890]. Zinc-binding motifs are stable structures, and they rarely undergo conformational changes upon binding their target.

This entry represents B-box-type zinc finger domains, which are around 40 residues in length. B-box zinc fingers can be divided into two groups, where types 1 and 2 B-box domains differ in their consensus sequence and in the spacing of the 7-8 zinc-binding residues. Several proteins contain both types 1 and 2 B-boxes, suggesting some level of cooperativity between these two domains. B-box domains are found in over 1500 proteins from a variety of organisms. They are found in TRIM (tripartite motif) proteins that consist of an N-terminal RING finger (originally called an A-box), followed by 1-2 B-box domains and a coiled-coil domain (also called RBCC for Ring, B-box, Coiled-Coil). TRIM proteins contain a type 2 B-box domain, and may also contain a type 1 B-box. In proteins that do not contain RING or coiled-coil domains, the B-box domain is primarily type 2. Many type 2 B-box proteins are involved in ubiquitinylation. Proteins containing a B-box zinc finger domain include transcription factors, ribonucleoproteins and proto-oncoproteins; for example, MID1, MID2, TRIM9, TNL, TRIM36, TRIM63, TRIFIC, NCL1 and CONSTANS-like proteins [PUBMED:16434393].

The microtubule-associated E3 ligase MID1 (EC) contains a type 1 B-box zinc finger domain. MID1 specifically binds Alpha-4, which in turn recruits the catalytic subunit of phosphatase 2A (PP2Ac). This complex is required for targeting of PP2Ac for proteasome-mediated degradation. The MID1 B-box coordinates two zinc ions and adopts a beta/beta/alpha cross-brace structure similar to that of ZZ, PHD, RING and FYVE zinc fingers [PUBMED:17428496, PUBMED:16529770].

More information about these proteins can be found at Protein of the Month: Zinc Fingers [PUBMED:].

Gene Ontology

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Domain organisation

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Alignments

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  Seed
(106)
Full
(7772)
Representative proteomes NCBI
(6434)
Meta
(9)
RP15
(1713)
RP35
(2306)
RP55
(3263)
RP75
(4488)
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Format an alignment

  Seed
(106)
Full
(7772)
Representative proteomes NCBI
(6434)
Meta
(9)
RP15
(1713)
RP35
(2306)
RP55
(3263)
RP75
(4488)
Alignment:
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  Seed
(106)
Full
(7772)
Representative proteomes NCBI
(6434)
Meta
(9)
RP15
(1713)
RP35
(2306)
RP55
(3263)
RP75
(4488)
Raw Stockholm Download   Download   Download   Download   Download   Download   Download   Download  
Gzipped Download   Download   Download   Download   Download   Download   Download   Download  

You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

External links

MyHits provides a collection of tools to handle multiple sequence alignments. For example, one can refine a seed alignment (sequence addition or removal, re-alignment or manual edition) and then search databases for remote homologs using HMMER3.

Pfam alignments:

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Curation and family details

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Seed source: Prosite
Previous IDs: none
Type: Domain
Author: Bateman A
Number in seed: 106
Number in full: 7772
Average length of the domain: 43.10 aa
Average identity of full alignment: 26 %
Average coverage of the sequence by the domain: 9.16 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 22.0 22.0
Trusted cut-off 22.0 22.0
Noise cut-off 21.9 21.9
Model length: 42
Family (HMM) version: 19
Download: download the raw HMM for this family

Species distribution

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Structures

For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the zf-B_box domain has been found. There are 16 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.

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