P24666 (PPAC_HUMAN) Reviewed, UniProtKB/Swiss-Prot
Last modified
May 29, 2013.
Version 147.
History...
Names·Attributes·General annotation·Ontologies·Interactions·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order
Names·Attributes·General annotation·Ontologies·Interactions·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: Low molecular weight phosphotyrosine protein phosphatase Short name=LMW-PTP Short name=LMW-PTPase EC=3.1.3.48 Alternative name(s): Adipocyte acid phosphatase Low molecular weight cytosolic acid phosphatase EC=3.1.3.2 Red cell acid phosphatase 1 | ||
| Gene names |
| ||
| Organism | Homo sapiens (Human) [Reference proteome] | ||
| Taxonomic identifier | 9606 [NCBI] | ||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo![]() |
Protein attributes
| Sequence length | 158 AA. |
| Sequence status | Complete. |
| Sequence processing | The displayed sequence is further processed into a mature form. |
| Protein existence | Evidence at protein level |
General annotation (Comments)
| Function | Acts on tyrosine phosphorylated proteins, low-MW aryl phosphates and natural and synthetic acyl phosphates. Isoform 3 does not possess phosphatase activity. |
| Catalytic activity | Protein tyrosine phosphate + H2O = protein tyrosine + phosphate. A phosphate monoester + H2O = an alcohol + phosphate. |
| Enzyme regulation | Inhibited by sulfhydryl reagents. |
| Subunit structure | Isoform 1 interacts with the SH3 domain of SPTAN1. There is no interaction observed for isoforms 2 or 3. Interacts with EPHA2; dephosphorylates EPHA2. Interacts with EPHB1. Ref.15 Ref.16 Ref.17 |
| Subcellular location | |
| Tissue specificity | |
| Polymorphism | ACP1 is genetically polymorphic. Three common alleles are known in Caucasians: ACP1*A, ACP1*B and ACP1*C. They give rise to six different phenotypes. Each allele appears to encode two electrophoretically different isozymes, F and S, which are produced in allele-specific ratios. The sequence shown is that of allele ACP1*B and allele ACP1*C. |
| Sequence similarities | Belongs to the low molecular weight phosphotyrosine protein phosphatase family. |
Ontologies
| Keywords | |
|---|---|
| Cellular component | Cytoplasm |
| Coding sequence diversity | Alternative splicing Polymorphism |
| Molecular function | Hydrolase Protein phosphatase |
| PTM | Acetylation Phosphoprotein |
| Technical term | 3D-structure Complete proteome Direct protein sequencing Reference proteome |
| Gene Ontology (GO) | |
| Biological_process | synaptic transmission Inferred from electronic annotation. Source: Compara |
| Cellular_component | cytoplasm Inferred from direct assay PubMed 10940933. Source: UniProtKB internal side of plasma membraneInferred from direct assay PubMed 10940933. Source: UniProtKB neuron projectionInferred from electronic annotation. Source: Compara nucleusInferred from direct assay. Source: HPA |
| Molecular_function | acid phosphatase activity Traceable author statement Ref.3. Source: ProtInc non-membrane spanning protein tyrosine phosphatase activityInferred from electronic annotation. Source: InterPro |
| Complete GO annotation... | |
Binary interactions
With | Entry | #Exp. | IntAct | Notes |
|---|---|---|---|---|
| itself | 1 | EBI-717701,EBI-717701 |
Alternative products
| This entry describes 3 isoforms produced by alternative splicing. [Align] [Select] Note: The ratio of isoform 1 to isoform 2 is 2:1 in allele A, 4:1 in allele B and 1:4 in allele C. | ||||||
| Isoform 1 (identifier: P24666-1) Also known as: F; A; Alpha; LMPTP-A; HCPTP-A; This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform 2 (identifier: P24666-2) Also known as: S; B; Beta; LMPTP-B; HCPTP-B; The sequence of this isoform differs from the canonical sequence as follows: 41-74: RVDSAATSGYEIGNPPDYRGQSCMKRHGIPMSHV → VIDSGAVSDWNVGRSPDPRAVSCLRNHGIHTAHK | ||||||
| Isoform 3 (identifier: P24666-3) Also known as: C; LMPTP-C; The sequence of this isoform differs from the canonical sequence as follows: 41-74: Missing. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | |||||||||||||||||||||||
Molecule processing | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Initiator methionine | 1 | 1 | Removed | |||||||||||||||||||||||||
| Chain | 2 – 158 | 157 | Low molecular weight phosphotyrosine protein phosphatase | PRO_0000046558 | ||||||||||||||||||||||||
Sites | ||||||||||||||||||||||||||||
| Active site | 13 | 1 | Nucleophile By similarity | |||||||||||||||||||||||||
| Active site | 19 | 1 | By similarity | |||||||||||||||||||||||||
| Active site | 130 | 1 | Proton donor By similarity | |||||||||||||||||||||||||
Amino acid modifications | ||||||||||||||||||||||||||||
| Modified residue | 2 | 1 | N-acetylalanine Ref.1 | |||||||||||||||||||||||||
| Modified residue | 132 | 1 | Phosphotyrosine Ref.6 | |||||||||||||||||||||||||
| Modified residue | 133 | 1 | Phosphotyrosine Ref.6 | |||||||||||||||||||||||||
Natural variations | ||||||||||||||||||||||||||||
| Alternative sequence | 41 – 74 | 34 | RVDSA…PMSHV → VIDSGAVSDWNVGRSPDPRA VSCLRNHGIHTAHK in isoform 2. | VSP_010087 | ||||||||||||||||||||||||
| Alternative sequence | 41 – 74 | 34 | Missing in isoform 3. | VSP_010088 | ||||||||||||||||||||||||
| Natural variant | 7 | 1 | K → N. Corresponds to variant rs11691572 [ dbSNP | Ensembl ]. | VAR_050526 | ||||||||||||||||||||||||
| Natural variant | 106 | 1 | Q → R in allele ACP1*A. Ref.12 Corresponds to variant rs7576247 [ dbSNP | Ensembl ]. | VAR_006171 | ||||||||||||||||||||||||
| Natural variant | 137 | 1 | S → F. Corresponds to variant rs35569198 [ dbSNP | Ensembl ]. | VAR_050527 | ||||||||||||||||||||||||
Experimental info | ||||||||||||||||||||||||||||
| Mutagenesis | 13 | 1 | C → S: Inactive. Ref.6 | |||||||||||||||||||||||||
| Mutagenesis | 132 | 1 | Y → F: Reduced phosphorylation and activity. Ref.6 | |||||||||||||||||||||||||
| Mutagenesis | 133 | 1 | Y → F: Reduced phosphorylation. No effect on activity. Ref.6 | |||||||||||||||||||||||||
| Sequence conflict | 2 – 6 | 5 | AEQAT → PRRGR in AAB27086. Ref.5 | |||||||||||||||||||||||||
| Sequence conflict | 13 – 20 | 8 | CLGNICRS → PARREAAR in AAB27085. Ref.5 | |||||||||||||||||||||||||
| Sequence conflict | 32 | 1 | T → W AA sequence Ref.1 | |||||||||||||||||||||||||
| Sequence conflict | 32 | 1 | T → W AA sequence Ref.2 | |||||||||||||||||||||||||
Secondary structure | ||||||||||||||||||||||||||||
Helix Strand Turn | ||||||||||||||||||||||||||||
| Beta strand | 7 – 18 | 12 | ||||||||||||||||||||||||||
| Helix | 19 – 33 | 15 | ||||||||||||||||||||||||||
| Helix | 37 – 39 | 3 | ||||||||||||||||||||||||||
| Beta strand | 40 – 49 | 10 | ||||||||||||||||||||||||||
| Turn | 50 – 53 | 4 | ||||||||||||||||||||||||||
| Helix | 58 – 66 | 9 | ||||||||||||||||||||||||||
| Helix | 80 – 85 | 6 | ||||||||||||||||||||||||||
| Beta strand | 87 – 93 | 7 | ||||||||||||||||||||||||||
| Helix | 94 – 104 | 11 | ||||||||||||||||||||||||||
| Beta strand | 113 – 116 | 4 | ||||||||||||||||||||||||||
| Helix | 117 – 120 | 4 | ||||||||||||||||||||||||||
| Helix | 136 – 155 | 20 | ||||||||||||||||||||||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Human red cell acid phosphatase (ACP1). The amino acid sequence of the two isozymes Bf and Bs encoded by the ACP1*B allele." Dissing J., Johnsen A.H., Sensabaugh G.F. J. Biol. Chem. 266:20619-20625(1991) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE (ALLELE B; ISOFORMS 1 AND 2). |
| [2] | "Human red cell acid phosphatase (ACP1): the primary structure of the two pairs of isozymes encoded by the ACP1*A and ACP1*C alleles." Dissing J., Johnsen A.H. Biochim. Biophys. Acta 1121:261-268(1992) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE (ALLELES A AND C; ISOFORMS 1 AND 2). |
| [3] | "Sequencing, cloning, and expression of human red cell-type acid phosphatase, a cytoplasmic phosphotyrosyl protein phosphatase." Wo Y.-Y.P., McCormack A.L., Shabonowitz J., Hunt D.F., Davis J.P., Mitchell G.L., van Etten R.L. J. Biol. Chem. 267:10856-10865(1992) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS 1 AND 2). |
| [4] | "Gene structure, sequence, and chromosomal localization of the human red cell-type low-molecular-weight acid phosphotyrosyl phosphatase gene, ACP1." Bryson G.L.M., Massa H., Trask B.J., van Etten R.L. Genomics 30:133-140(1995) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. |
| [5] | "Identification of the adipocyte acid phosphatase as a PAO-sensitive tyrosyl phosphatase." Shekels L.L., Smith A.J., van Etten R.L., Bernlohr D.A. Protein Sci. 1:710-721(1992) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE (ISOFORMS 1 AND 2). Tissue: Adipocyte. |
| [6] | "Regulation of the low molecular weight phosphotyrosine phosphatase by phosphorylation at tyrosines 131 and 132." Tailor P., Gilman J., Williams S., Couture C., Mustelin T. J. Biol. Chem. 272:5371-5374(1997) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE (ISOFORM 2), TISSUE SPECIFICITY, PHOSPHORYLATION AT TYR-132 AND TYR-133, MUTAGENESIS OF CYS-13; TYR-132 AND TYR-133. |
| [7] | "A novel isoform of the low molecular weight phosphotyrosine phosphatase, LMPTP-C, arising from alternative mRNA splicing." Tailor P., Gilman J., Williams S., Mustelin T. Eur. J. Biochem. 262:277-282(1999) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE (ISOFORM 3). |
| [8] | "Complete sequencing and characterization of 21,243 full-length human cDNAs." Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S. Sugano S.Nat. Genet. 36:40-45(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS 1 AND 2). Tissue: Hippocampus and Skeletal muscle. |
| [9] | "Cloning of human full-length CDSs in BD Creator(TM) system donor vector." Kalnine N., Chen X., Rolfs A., Halleck A., Hines L., Eisenstein S., Koundinya M., Raphael J., Moreira D., Kelley T., LaBaer J., Lin Y., Phelan M., Farmer A. Submitted (MAY-2003) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 2). |
| [10] | "Generation and annotation of the DNA sequences of human chromosomes 2 and 4." Hillier L.W., Graves T.A., Fulton R.S., Fulton L.A., Pepin K.H., Minx P., Wagner-McPherson C., Layman D., Wylie K., Sekhon M., Becker M.C., Fewell G.A., Delehaunty K.D., Miner T.L., Nash W.E., Kremitzki C., Oddy L., Du H. Wilson R.K.Nature 434:724-731(2005) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [11] | Mural R.J., Istrail S., Sutton G.G., Florea L., Halpern A.L., Mobarry C.M., Lippert R., Walenz B., Shatkay H., Dew I., Miller J.R., Flanigan M.J., Edwards N.J., Bolanos R., Fasulo D., Halldorsson B.V., Hannenhalli S., Turner R. Venter J.C.Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [12] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS 1 AND 2), VARIANT ARG-106. Tissue: Muscle and Placenta. |
| [13] | Lubec G., Vishwanath V. Submitted (MAR-2007) to UniProtKB Cited for: PROTEIN SEQUENCE OF 42-59, MASS SPECTROMETRY. Tissue: Brain and Cajal-Retzius cell. |
| [14] | "A TaqI site identifies the *A allele at the ACP1 locus." Sensabaugh G.F., Lazaruk K.A. Hum. Mol. Genet. 2:1079-1079(1993) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 99-158 (ISOFORMS 1/2). Tissue: Blood. |
| [15] | "Eph receptors discriminate specific ligand oligomers to determine alternative signaling complexes, attachment, and assembly responses." Stein E., Lane A.A., Cerretti D.P., Schoecklmann H.O., Schroff A.D., Van Etten R.L., Daniel T.O. Genes Dev. 12:667-678(1998) [PubMed] [Europe PMC] [Abstract] Cited for: INTERACTION WITH EPHB1. |
| [16] | "Regulation of the EphA2 kinase by the low molecular weight tyrosine phosphatase induces transformation." Kikawa K.D., Vidale D.R., Van Etten R.L., Kinch M.S. J. Biol. Chem. 277:39274-39279(2002) [PubMed] [Europe PMC] [Abstract] Cited for: INTERACTION WITH EPHA2. |
| [17] | "Tyrosine phosphorylation regulates alpha II spectrin cleavage by calpain." Nicolas G., Fournier C.M., Galand C., Malbert-Colas L., Bournier O., Kroviarski Y., Bourgeois M., Camonis J.H., Dhermy D., Grandchamp B., Lecomte M.-C. Mol. Cell. Biol. 22:3527-3536(2002) [PubMed] [Europe PMC] [Abstract] Cited for: INTERACTION WITH SPTAN1. |
| [18] | "Initial characterization of the human central proteome." Burkard T.R., Planyavsky M., Kaupe I., Breitwieser F.P., Buerckstuemmer T., Bennett K.L., Superti-Furga G., Colinge J. BMC Syst. Biol. 5:17-17(2011) [PubMed] [Europe PMC] [Abstract] Cited for: IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS]. |
| [19] | "Crystal structure of a human low molecular weight phosphotyrosyl phosphatase. Implications for substrate specificity." Zhang M., Stauffacher C.V., Lin D., van Etten R.L. J. Biol. Chem. 273:21714-21720(1998) [PubMed] [Europe PMC] [Abstract] Cited for: X-RAY CRYSTALLOGRAPHY (2.2 ANGSTROMS). |
| + | Additional computationally mapped references. |
Cross-references
Sequence databases | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EMBL GenBank DDBJ | M83653 mRNA. Translation: AAB59354.1. M83654 mRNA. Translation: AAB59355.1. U25849, U25847, U25848 Genomic DNA. Translation: AAC52067.1. S62884 mRNA. Translation: AAB27085.1. S62885 mRNA. Translation: AAB27086.1. M87545 mRNA. No translation available. AK289934 mRNA. Translation: BAF82623.1. AK291861 mRNA. Translation: BAF84550.1. BT007136 mRNA. Translation: AAP35800.1. AC079779 Genomic DNA. Translation: AAY14958.1. CH471053 Genomic DNA. Translation: EAX01112.1. CH471053 Genomic DNA. Translation: EAX01116.1. BC007422 mRNA. Translation: AAH07422.1. BC106011 mRNA. Translation: AAI06012.1. L06508 Genomic DNA. Translation: AAB59628.1. | ||||||||||||||||||||||||
| IPI | IPI00218847. IPI00219861. IPI00410615. | ||||||||||||||||||||||||
| PIR | A38148. B38148. | ||||||||||||||||||||||||
| RefSeq | NP_004291.1. NM_004300.3. NP_009030.1. NM_007099.3. | ||||||||||||||||||||||||
| UniGene | Hs.558296. | ||||||||||||||||||||||||
3D structure databases | |||||||||||||||||||||||||
| PDBe RCSB PDB PDBj |
| ||||||||||||||||||||||||
| ProteinModelPortal | P24666. | ||||||||||||||||||||||||
| ModBase | Search... | ||||||||||||||||||||||||
Protein-protein interaction databases | |||||||||||||||||||||||||
| IntAct | P24666. 6 interactions. | ||||||||||||||||||||||||
| STRING | 9606.ENSP00000272065. | ||||||||||||||||||||||||
PTM databases | |||||||||||||||||||||||||
| PhosphoSite | P24666. | ||||||||||||||||||||||||
Polymorphism databases | |||||||||||||||||||||||||
| DMDM | 1709543. | ||||||||||||||||||||||||
2D gel databases | |||||||||||||||||||||||||
| REPRODUCTION-2DPAGE | IPI00218847. IPI00219861. | ||||||||||||||||||||||||
Proteomic databases | |||||||||||||||||||||||||
| PaxDb | P24666. | ||||||||||||||||||||||||
| PRIDE | P24666. | ||||||||||||||||||||||||
Protocols and materials databases | |||||||||||||||||||||||||
| DNASU | 52. | ||||||||||||||||||||||||
| StructuralBiologyKnowledgebase | Search... | ||||||||||||||||||||||||
Genome annotation databases | |||||||||||||||||||||||||
| Ensembl | ENST00000272065; ENSP00000272065; ENSG00000143727. ENST00000272067; ENSP00000272067; ENSG00000143727. | ||||||||||||||||||||||||
| GeneID | 52. | ||||||||||||||||||||||||
| KEGG | hsa:52. | ||||||||||||||||||||||||
| UCSC | uc002qwf.3. human. uc002qwg.3. human. | ||||||||||||||||||||||||
Organism-specific databases | |||||||||||||||||||||||||
| CTD | 52. | ||||||||||||||||||||||||
| GeneCards | GC02P000254. | ||||||||||||||||||||||||
| HGNC | HGNC:122. ACP1. | ||||||||||||||||||||||||
| HPA | HPA016754. | ||||||||||||||||||||||||
| MIM | 171500. gene. | ||||||||||||||||||||||||
| neXtProt | NX_P24666. | ||||||||||||||||||||||||
| PharmGKB | PA24446. | ||||||||||||||||||||||||
| GenAtlas | Search... | ||||||||||||||||||||||||
Phylogenomic databases | |||||||||||||||||||||||||
| eggNOG | COG0394. | ||||||||||||||||||||||||
| HOVERGEN | HBG007540. | ||||||||||||||||||||||||
| InParanoid | P24666. | ||||||||||||||||||||||||
| KO | K14394. | ||||||||||||||||||||||||
| OMA | WHEGEPA. | ||||||||||||||||||||||||
| PhylomeDB | P24666. | ||||||||||||||||||||||||
Enzyme and pathway databases | |||||||||||||||||||||||||
| Pathway_Interaction_DB | epha2_fwdpathway. EPHA2 forward signaling. pdgfrbpathway. PDGFR-beta signaling pathway. | ||||||||||||||||||||||||
| SignaLink | P24666. | ||||||||||||||||||||||||
Gene expression databases | |||||||||||||||||||||||||
| ArrayExpress | P24666. | ||||||||||||||||||||||||
| Bgee | P24666. | ||||||||||||||||||||||||
| CleanEx | HS_ACP1. | ||||||||||||||||||||||||
| Genevestigator | P24666. | ||||||||||||||||||||||||
| GermOnline | ENSG00000143727. Homo sapiens. | ||||||||||||||||||||||||
Family and domain databases | |||||||||||||||||||||||||
| InterPro | IPR023485. Ptyr_pPase_SF. IPR002115. Tyr_Pase_low_mol_wt_mml. IPR000106. Tyr_phospatase/Ars_reductase. IPR017867. Tyr_phospatase_low_mol_wt. [Graphical view] | ||||||||||||||||||||||||
| PANTHER | PTHR11717. PTHR11717. 1 hit. | ||||||||||||||||||||||||
| Pfam | PF01451. LMWPc. 1 hit. [Graphical view] | ||||||||||||||||||||||||
| PRINTS | PR00719. LMWPTPASE. PR00720. MAMMALPTPASE. | ||||||||||||||||||||||||
| SMART | SM00226. LMWPc. 1 hit. [Graphical view] | ||||||||||||||||||||||||
| SUPFAM | SSF52788. Tyr_Pase_low_mol_wt. 1 hit. | ||||||||||||||||||||||||
| ProtoNet | Search... | ||||||||||||||||||||||||
Other | |||||||||||||||||||||||||
| BindingDB | P24666. | ||||||||||||||||||||||||
| ChEMBL | CHEMBL4903. | ||||||||||||||||||||||||
| EvolutionaryTrace | P24666. | ||||||||||||||||||||||||
| GenomeRNAi | 52. | ||||||||||||||||||||||||
| NextBio | 205. | ||||||||||||||||||||||||
| SOURCE | Search... | ||||||||||||||||||||||||
Entry information
| Entry name | PPAC_HUMAN | ||||||||
| Accession | Primary (citable) accession number: P24666 Secondary accession number(s): A8K1L9 Q53RU0 | ||||||||
| Entry history |
| ||||||||
| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation program | Chordata Protein Annotation Program | ||||||||
| Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. | ||||||||
Relevant documents
| Human chromosome 2 Human chromosome 2: entries, gene names and cross-references to MIM |
| Human entries with polymorphisms or disease mutations List of human entries with polymorphisms or disease mutations |
| Human polymorphisms and disease mutations Index of human polymorphisms and disease mutations |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| PDB cross-references Index of Protein Data Bank (PDB) cross-references |
| SIMILARITY comments Index of protein domains and families |

Clusters with
