Kazal type serine protease inhibitors and follistatin-like domains. Kazal inhibitors inhibit serine proteases, such as, trypsin, chyomotrypsin, avian ovomucoids, and elastases. The inhibitory domain has one reactive site peptide bond, which serves the cognate enzyme as substrate. The reactive site peptide bond is a combining loop which has an identical conformation in all Kazal inhibitors and in all enzyme/inhibitor complexes. These Kazal domains (small hydrophobic core of alpha/beta structure with 3 to 4 disulfide bonds) often occur in tandem arrays. Similar domains are also present in follistatin (FS) and follistatin-like family members, which play an important role in tissue specific regulation. The FS domain consists of an N-terminal beta hairpin (FOLN/EGF-like domain) and a Kazal-like domain and has five disulfide bonds. Although the Kazal-like FS substructure is similar to Kazal proteinase inhibitors, no FS domain has yet been shown to be a proteinase inhibitor. Follistatin-like family members include SPARC, also known as, BM-40 or osteonectin, the Gallus gallus Flik protein, as well as, agrin which has a long array of FS domains. The kazal-type inhibitor domain has also been detected in an extracellular loop region of solute carrier 21 (SLC21) family members (organic anion transporters) , which may regulate the specificity of anion uptake. The distant homolog, Ascidian trypsin inhibitor, is included in this CD.

                          10        20        30
                  ....*....|....*....|....*....|....*
gi 1907130265  35 CRPYLDSndKCTREYHPVCSTSGKTYCNKCTFCKA 69
Cdd:pfam00050   1 CSDYPSG--ACPRIYDPVCGTDGKTYSNECLFCAE 33

Kazal type serine protease inhibitors; Kazal type serine protease inhibitors and follistatin-like domains.

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....
gi 1907130265  119 PNQCTREWNPVCGTNGFTYSNECVFCNAKIAAKEKIDYRHFGPC 162
Cdd:smart00280   3 PEACPREYDPVCGSDGVTYSNECHLCKAACESGKSIEVKHDGPC 46

Kazal-type serine protease inhibitor domain; Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containing three disulphides. Alignment also includes a single domain from transporters in the OATP/PGT family.

                          10        20        30
                  ....*....|....*....|....*....|....*
gi 1907130265  35 CRPYLDSndKCTREYHPVCSTSGKTYCNKCTFCKA 69
Cdd:pfam00050   1 CSDYPSG--ACPRIYDPVCGTDGKTYSNECLFCAE 33

Kazal type serine protease inhibitors and follistatin-like domains. Kazal inhibitors inhibit serine proteases, such as, trypsin, chyomotrypsin, avian ovomucoids, and elastases. The inhibitory domain has one reactive site peptide bond, which serves the cognate enzyme as substrate. The reactive site peptide bond is a combining loop which has an identical conformation in all Kazal inhibitors and in all enzyme/inhibitor complexes. These Kazal domains (small hydrophobic core of alpha/beta structure with 3 to 4 disulfide bonds) often occur in tandem arrays. Similar domains are also present in follistatin (FS) and follistatin-like family members, which play an important role in tissue specific regulation. The FS domain consists of an N-terminal beta hairpin (FOLN/EGF-like domain) and a Kazal-like domain and has five disulfide bonds. Although the Kazal-like FS substructure is similar to Kazal proteinase inhibitors, no FS domain has yet been shown to be a proteinase inhibitor. Follistatin-like family members include SPARC, also known as, BM-40 or osteonectin, the Gallus gallus Flik protein, as well as, agrin which has a long array of FS domains. The kazal-type inhibitor domain has also been detected in an extracellular loop region of solute carrier 21 (SLC21) family members (organic anion transporters) , which may regulate the specificity of anion uptake. The distant homolog, Ascidian trypsin inhibitor, is included in this CD.

                          10        20
                  ....*....|....*....|....*
gi 1907130265  45 CTREYHPVCSTSGKTYCNKCTFCKA 69
Cdd:cd00104     1 CPKEYDPVCGSDGKTYSNECHLGCA 25

Kazal type serine protease inhibitors; Kazal type serine protease inhibitors and follistatin-like domains.

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....
gi 1907130265  119 PNQCTREWNPVCGTNGFTYSNECVFCNAKIAAKEKIDYRHFGPC 162
Cdd:smart00280   3 PEACPREYDPVCGSDGVTYSNECHLCKAACESGKSIEVKHDGPC 46

Kazal-type pancreatic secretory trypsin inhibitors (PSTI) and related proteins, including the second domain of the ovomucoid turkey inhibitor and the C-terminal domain of the esophagus cancer-related gene-2 protein (ECRG-2), are members of the superfamily of kazal-type proteinase inhibitors and follistatin-like proteins.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|.
gi 1907130265 122 CTREWNPVCGTNGFTYSNECVFCNAKIAAKEKIDYRHFGPC 162
Cdd:cd01327     5 CPKDYDPVCGTDGVTYSNECLLCAENLKRQTNIRIKHDGEC 45

Kazal type serine protease inhibitors; Kazal type serine protease inhibitors and follistatin-like domains.

                           10        20
                   ....*....|....*....|....*
gi 1907130265   45 CTREYHPVCSTSGKTYCNKCTFCKA 69
Cdd:smart00280   6 CPREYDPVCGSDGVTYSNECHLCKA 30

Kazal type serine protease inhibitors and follistatin-like domains. Kazal inhibitors inhibit serine proteases, such as, trypsin, chyomotrypsin, avian ovomucoids, and elastases. The inhibitory domain has one reactive site peptide bond, which serves the cognate enzyme as substrate. The reactive site peptide bond is a combining loop which has an identical conformation in all Kazal inhibitors and in all enzyme/inhibitor complexes. These Kazal domains (small hydrophobic core of alpha/beta structure with 3 to 4 disulfide bonds) often occur in tandem arrays. Similar domains are also present in follistatin (FS) and follistatin-like family members, which play an important role in tissue specific regulation. The FS domain consists of an N-terminal beta hairpin (FOLN/EGF-like domain) and a Kazal-like domain and has five disulfide bonds. Although the Kazal-like FS substructure is similar to Kazal proteinase inhibitors, no FS domain has yet been shown to be a proteinase inhibitor. Follistatin-like family members include SPARC, also known as, BM-40 or osteonectin, the Gallus gallus Flik protein, as well as, agrin which has a long array of FS domains. The kazal-type inhibitor domain has also been detected in an extracellular loop region of solute carrier 21 (SLC21) family members (organic anion transporters) , which may regulate the specificity of anion uptake. The distant homolog, Ascidian trypsin inhibitor, is included in this CD.

                          10        20
                  ....*....|....*....|....*
gi 1907130265  45 CTREYHPVCSTSGKTYCNKCTFCKA 69
Cdd:cd00104     1 CPKEYDPVCGSDGKTYSNECHLGCA 25