@prefix ex:<https://purl.expasy.org/sparql-examples/neXtProt/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema: <https://schema.org/> .
@prefix sh: <http://www.w3.org/ns/shacl#> .

ex:NXQ_00144 a sh:SPARQLExecutable,
        sh:SPARQLSelectExecutable ;
    rdfs:comment "Proteins that contains a sequence \"QHP\" where the Proline is amidated"@en ;
    sh:prefixes _:sparql_examples_prefixes ;
    sh:select """PREFIX : <http://nextprot.org/rdf/>
PREFIX nextprot_cv: <http://nextprot.org/rdf/terminology/>

SELECT DISTINCT ?entry WHERE {
?entry :isoform ?isoform.
?isoform :ptm ?ptm.
?ptm :term nextprot_cv:PTM-0257 . # Proline amide
?ptm :start ?ptmpos .
?isoform :sequence / :chain ?seq.
bind(substr(?seq, ?ptmpos-2, 3) as ?modseq)
filter ( regex(?modseq, "QHP") )
}""" ;
    schema:keywords "PTM",
        "sequence",
        "tutorial" ;
    schema:target <https://sparql.nextprot.org/sparql> .