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2.A.29.25.1
The mitochondrial presenilin-associated protein (PSAP; MTCH1) binds to the PDZ domain (a QFYI motif) C-terminus of presenilin. It contains 2 solcar repeats and is 389 aas long. It is most similar to 2.A.29.23.1 and 2.A.29.12.1. There are 2 human isoforms, mitochondrial carrier homologues, MTCH1 and MTCH2, possibly involved in apoptosis (Xu et al., 1999, 2002). Its transport function is unknown (Xu et al., 1999, 2002).  Surprisingly, this protein has been reported to be targetted to the outer mitochonrdial membrane (Gutiérrez-Aguilar and Baines 2013). Two proapoptotic PSAP isoforms generated by alternative splicing differ in the length of a hydrophilic loop located between two predicted transmembrane domains. Both isoforms are expressed in human and rat tissues. PSAP probably contains multiple mitochondrial targeting motifs dispersed along the protein (Lamarca et al. 2007).

Accession Number:Q9NZJ7
Protein Name:MTCH1 aka PSAP
Length:389
Molecular Weight:41544.00
Species:Homo sapiens (Human) [9606]
Number of TMSs:3
Location1 / Topology2 / Orientation3: Mitochondrion inner membrane1 / Multi-pass membrane protein2
Substrate

Cross database links:

RefSeq: NP_055156.1   
Entrez Gene ID: 23787   
Pfam: PF00153   
OMIM: 610449  gene
KEGG: hsa:23787   

Gene Ontology

GO:0016021 C:integral to membrane
GO:0005743 C:mitochondrial inner membrane
GO:0005515 F:protein binding
GO:0006919 P:activation of caspase activity
GO:0045161 P:neuronal ion channel clustering
GO:0043065 P:positive regulation of apoptosis
GO:0009966 P:regulation of signal transduction
GO:0055085 P:transmembrane transport

References (6)

[1] “The secreted protein discovery initiative (SPDI), a large-scale effort to identify novel human secreted and transmembrane proteins: a bioinformatics assessment.”  Clark H.F.et.al.   12975309
[2] “Complete sequencing and characterization of 21,243 full-length human cDNAs.”  Ota T.et.al.   14702039
[3] “The DNA sequence and analysis of human chromosome 6.”  Mungall A.J.et.al.   14574404
[4] “The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).”  The MGC Project Teamet.al.   15489334
[5] “Identification of a novel PSD-95/Dlg/ZO-1 (PDZ)-like protein interacting with the C terminus of presenilin-1.”  Xu X.et.al.   10551805
[6] “The novel presenilin-1-associated protein is a proapoptotic mitochondrial protein.”  Xu X.et.al.   12377771

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FASTA formatted sequence 
1:	MGASDPEVAP WARGGAAGMA GAGAGAGARG GAAAGVEARA RDPPPAHRAH PRHPRPAAQP 
61:	SARRMDGGSG GLGSGDNAPT TEALFVALGA GVTALSHPLL YVKLLIQVGH EPMPPTLGTN 
121:	VLGRKVLYLP SFFTYAKYIV QVDGKIGLFR GLSPRLMSNA LSTVTRGSMK KVFPPDEIEQ 
181:	VSNKDDMKTS LKKVVKETSY EMMMQCVSRM LAHPLHVISM RCMVQFVGRE AKYSGVLSSI 
241:	GKIFKEEGLL GFFVGLIPHL LGDVVFLWGC NLLAHFINAY LVDDSVSDTP GGLGNDQNPG 
301:	SQFSQALAIR SYTKFVMGIA VSMLTYPFLL VGDLMAVNNC GLQAGLPPYS PVFKSWIHCW 
361:	KYLSVQGQLF RGSSLLFRRV SSGSCFALE