<p>Provides any useful information about the protein, mostly biological knowledge.</p><p><a href='../manual/function_section' target='_top'>More...</a></p>Functionⁱ

<p>Describes the catalytic activity of an enzyme, i.e. the chemical reaction it catalyzes. This information usually correlates with the presence of an EC (Enzyme Commission) number in the ‘Names and taxonomy’ section.</p><p><a href='../manual/catalytic_activity' target='_top'>More...</a></p>Catalytic activityⁱ

<p>Provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.</p><p><a href='../manual/cofactor' target='_top'>More...</a></p>Cofactorⁱ

<p>Describes an enzyme regulatory mechanism and reports the components which regulate (by activation or inhibition) the reaction.</p><p><a href='../manual/enzyme_regulation' target='_top'>More...</a></p>Enzyme regulationⁱ

<p>Describes the metabolic pathway(s) associated with a protein.</p><p><a href='../manual/pathway' target='_top'>More...</a></p>Pathwayⁱ

Sites

Feature key	Position(s)	Length	Description	Graphical view	Feature identifier	Actions
<p>Is used for enzymes and indicates the residues directly involved in catalysis.</p><p><a href='../manual/act_site' target='_top'>More...</a></p>Active sitei	21 – 21	1	Proton donor/acceptorBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	81 – 81	1	FADBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	113 – 113	1	SubstrateBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	153 – 153	1	FADBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	175 – 175	1	FADBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	182 – 182	1	FADBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	193 – 193	1	SubstrateBy similarity
<p>Describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.</p><p><a href='../manual/binding' target='_top'>More...</a></p>Binding sitei	285 – 285	1	SubstrateBy similarity

Regions

Feature key	Position(s)	Length	Description	Graphical view	Feature identifier	Actions
<p>Describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.</p><p><a href='../manual/np_bind' target='_top'>More...</a></p>Nucleotide bindingi	21 – 26	6	NADBy similarity
<p>Describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.</p><p><a href='../manual/np_bind' target='_top'>More...</a></p>Nucleotide bindingi	52 – 53	2	NAD and FADBy similarity
<p>Describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.</p><p><a href='../manual/np_bind' target='_top'>More...</a></p>Nucleotide bindingi	111 – 113	3	FADBy similarity
<p>Describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.</p><p><a href='../manual/np_bind' target='_top'>More...</a></p>Nucleotide bindingi	157 – 160	4	FADBy similarity

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:</p><p><a href='../manual/gene_ontology' target='_top'>More...</a></p>GO - Molecular functionⁱ

1. methylenetetrahydrofolate reductase (NAD(P)H) activity Source: UniProtKB-EC

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:</p><p><a href='../manual/gene_ontology' target='_top'>More...</a></p>GO - Biological processⁱ

1. methionine metabolic process Source: InterPro
2. tetrahydrofolate interconversion Source: UniProtKB-UniPathway

<p>UniProtKB Keywords constitute a <a target="_top" href="/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='../help/keywords' target='_top'>More...</a></p>Keywords - Molecular functionⁱ

<p>UniProtKB Keywords constitute a <a target="_top" href="/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='../help/keywords' target='_top'>More...</a></p>Keywords - Ligandⁱ

Enzyme and pathway databases

<p>Provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.</p><p><a href='../manual/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyⁱ

Organism-specific databases

<p>Describes post-translational modifications (PTMs) and/or processing events.</p><p><a href='../manual/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingⁱ

Molecule processing

Feature key	Position(s)	Length	Description	Graphical view	Feature identifier	Actions
<p>Describes the extent of a polypeptide chain in the mature protein following processing.</p><p><a href='../manual/chain' target='_top'>More...</a></p>Chaini	1 – 593	593	Methylenetetrahydrofolate reductase 1		PRO_0000190251	Add BLAST

Proteomic databases

<p>Provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.</p><p><a href='../manual/interaction_section' target='_top'>More...</a></p>Interactionⁱ

<p>Provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the ‘Function’ section).</p><p><a href='../manual/subunit_structure' target='_top'>More...</a></p>Subunit structureⁱ

<p>Provides information on the tertiary structure of a protein.</p><p><a href='../manual/structure_section' target='_top'>More...</a></p>Structureⁱ

3D structure databases

<p>Provides information on sequence similarities with other proteins and the domain(s) present in a protein.</p><p><a href='../manual/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsⁱ

<p>Provides information about the sequence similarity with other proteins.</p><p><a href='../manual/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesⁱ

Phylogenomic databases

Family and domain databases

<p>Displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including length and molecular weight.</p><p><a href='../manual/sequences_section' target='_top'>More...</a></p>Sequenceⁱ

<p>Indicates if the canonical sequence displayed by default in the entry is complete or not.</p><p><a href='../manual/sequence_status' target='_top'>More...</a></p>Sequence statusⁱ: Complete.

        10         20         30         40         50
MKVIEKILEA AGDGRTAFSF EYFPPKTEEG VENLFERMDR MVAHGPSFCD 
        60         70         80         90        100
ITWGAGGSTA DLTLEIANRM QNMVCVETMM HLTCTNMPVE KIDHALETIK 
       110        120        130        140        150
SNGIQNVLAL RGDPPHGQDK FVQVEGGFAC ALDLVQHIRA KYGDYFGITV 
       160        170        180        190        200
AGYPEAHPDA IQGEGGATLE AYSNDLAYLK RKVDAGADLI VTQLFYDTDI 
       210        220        230        240        250
FLKFVNDCRQ IGITCPIVPG IMPINNYKGF LRMTGFCKTK IPSEITAALD 
       260        270        280        290        300
PIKDNEEAVR QYGIHLGTEM CKKILATGIK TLHLYTLNMD KSAIGILMNL 
       310        320        330        340        350
GLIEESKVSR PLPWRPATNV FRVKEDVRPI FWANRPKSYL KRTLGWDQYP 
       360        370        380        390        400
HGRWGDSRNP SYGALTDHQF TRPRGRGKKL QEEWAVPLKS VEDISERFTN 
       410        420        430        440        450
FCQGKLTSSP WSELDGLQPE TKIIDDQLVN INQKGFLTIN SQPAVNGEKS 
       460        470        480        490        500
DSPTVGWGGP GGYVYQKAYL EFFCAKEKLD QLIEKIKAFP SLTYIAVNKD 
       510        520        530        540        550
GETFSNISPN AVNAVTWGVF PGKEIIQPTV VDHASFMVWK DEAFEIWTRG 
       560        570        580        590 
WGCMFPEGDS SRELLEKVQK TYYLVSLVDN DYVQGDLFAA FKI 

Sequence databases

Genome annotation databases

<p>Is used to point to information related to entries and found in data collections other than UniProtKB.</p><p><a href='../manual/cross_references_section' target='_top'>More...</a></p> Cross-referencesⁱ

Sequence databases

3D structure databases

Proteomic databases

Protocols and materials databases

Genome annotation databases

Organism-specific databases

Phylogenomic databases

Enzyme and pathway databases

Family and domain databases

<p>Contains the literature citations that are the sources of data used to annotate the entry. Each reference is numbered and contains several subsections allowing a precise description of a given citation.</p><p><a href='../manual/publications_section' target='_top'>More...</a></p>Publicationsⁱ

1. "Isolation, characterization, and functional expression of cDNAs encoding NADH-dependent methylenetetrahydrofolate reductase from higher plants."
   Roje S., Wang H., McNeil S.D., Raymond R.K., Appling D.R., Shachar-Hill Y., Bohnert H.J., Hanson A.D.
   J. Biol. Chem. 274:36089-36096(1999) [PubMed] [Europe PMC] [Abstract]
   Cited for: NUCLEOTIDE SEQUENCE [MRNA], FUNCTION, ENZYME REGULATION.

<p>Provides general information on the entry.</p><p><a href='../manual/entry_information_section' target='_top'>More...</a></p>Entry informationⁱ

<p>Contains any relevant information that doesn’t fit in any other defined sections</p><p><a href='../manual/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousⁱ

<p>UniProtKB Keywords constitute a <a target="_top" href="/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='../help/keywords' target='_top'>More...</a></p>Keywords - Technical termⁱ

Documents

1. PATHWAY comments
   Index of metabolic and biosynthesis pathways
2. SIMILARITY comments
   Index of protein domains and families

External Data

<p>Provides links to the UniProt Reference Clusters (<a href="/help/uniref">UniRef</a>). UniRef consists of clusters for UniProtKB sequences (including isoforms) and selected UniParc sequences, in order to obtain complete coverage of the sequence space at resolutions of 100%, 90% and 50% identity.</p><p><a href='../manual/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsⁱ