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37 /* This file is completely threadsafe - keep it that way! */
43 #include "gromacs/fileio/pdbio.h"
44 #include "gromacs/math/vec.h"
45 #include "gromacs/math/units.h"
48 #include "gromacs/utility/cstringutil.h"
51 #include "gromacs/topology/block.h"
52 #include "gromacs/utility/fatalerror.h"
53 #include "gromacs/utility/smalloc.h"
55 static int in_strings(char *key
, int nstr
, const char **str
)
59 for (j
= 0; (j
< nstr
); j
++)
61 if (strcmp(str
[j
], key
) == 0)
70 static gmx_bool
hbond(rvec x
[], int i
, int j
, real distance
)
72 real tol
= distance
*distance
;
75 rvec_sub(x
[i
], x
[j
], tmp
);
77 return (iprod(tmp
, tmp
) < tol
);
80 static void chk_allhb(t_atoms
*pdba
, rvec x
[], t_blocka
*hb
,
81 gmx_bool donor
[], gmx_bool accept
[], real dist
)
83 int i
, j
, k
, ii
, natom
;
86 snew(hb
->index
, natom
+1);
93 for (i
= 0; (i
< natom
); i
++)
97 for (j
= i
+1; (j
< natom
); j
++)
99 if ((accept
[j
]) && (hbond(x
, i
, j
, dist
)))
107 for (j
= i
+1; (j
< natom
); j
++)
109 if ((donor
[j
]) && (hbond(x
, i
, j
, dist
)))
120 static void pr_hbonds(FILE *fp
, t_blocka
*hb
, t_atoms
*pdba
)
124 fprintf(fp
, "Dumping all hydrogen bonds!\n");
125 for (i
= 0; (i
< hb
->nr
); i
++)
129 for (j
= j0
; (j
< j1
); j
++)
132 fprintf(fp
, "%5s%4d%5s - %5s%4d%5s\n",
133 *pdba
->resinfo
[pdba
->atom
[i
].resind
].name
,
134 pdba
->resinfo
[pdba
->atom
[i
].resind
].nr
, *pdba
->atomname
[i
],
135 *pdba
->resinfo
[pdba
->atom
[k
].resind
].name
,
136 pdba
->resinfo
[pdba
->atom
[k
].resind
].nr
, *pdba
->atomname
[k
]);
141 static gmx_bool
chk_hbonds(int i
, t_atoms
*pdba
, rvec x
[],
142 gmx_bool ad
[], gmx_bool hbond
[], rvec xh
,
143 real angle
, real dist
)
146 int j
, aj
, ri
, natom
;
152 ri
= pdba
->atom
[i
].resind
;
154 for (j
= 0; (j
< natom
); j
++)
156 /* Check whether the other atom is a donor/acceptor and not i */
157 if ((ad
[j
]) && (j
!= i
))
159 /* Check whether the other atom is on the same ring as well */
160 if ((pdba
->atom
[j
].resind
!= ri
) ||
161 ((strcmp(*pdba
->atomname
[j
], "ND1") != 0) &&
162 (strcmp(*pdba
->atomname
[j
], "NE2") != 0)))
165 d2
= distance2(x
[i
], x
[j
]);
166 rvec_sub(x
[i
], xh
, nh
);
167 rvec_sub(x
[aj
], xh
, oh
);
168 a
= RAD2DEG
* acos(cos_angle(nh
, oh
));
169 if ((d2
< dist2
) && (a
> angle
))
174 "HBOND between %s%d-%s and %s%d-%s is %g nm, %g deg\n",
175 *pdba
->resinfo
[pdba
->atom
[i
].resind
].name
,
176 pdba
->resinfo
[pdba
->atom
[i
].resind
].nr
, *pdba
->atomname
[i
],
177 *pdba
->resinfo
[pdba
->atom
[aj
].resind
].name
,
178 pdba
->resinfo
[pdba
->atom
[aj
].resind
].nr
, *pdba
->atomname
[aj
],
190 static void calc_ringh(rvec xattach
, rvec xb
, rvec xc
, rvec xh
)
195 /* Add a proton on a ring to atom attach at distance 0.1 nm */
196 rvec_sub(xattach
, xb
, tab
);
197 rvec_sub(xattach
, xc
, tac
);
198 rvec_add(tab
, tac
, xh
);
201 rvec_inc(xh
, xattach
);
204 void set_histp(t_atoms
*pdba
, rvec
*x
, real angle
, real dist
)
206 static const char *prot_acc
[] = {
207 "O", "OD1", "OD2", "OE1", "OE2", "OG", "OG1", "OH", "OW"
209 #define NPA asize(prot_acc)
210 static const char *prot_don
[] = {
211 "N", "NH1", "NH2", "NE", "ND1", "ND2", "NE2", "NZ", "OG", "OG1", "OH", "NE1", "OW"
213 #define NPD asize(prot_don)
215 gmx_bool
*donor
, *acceptor
;
216 gmx_bool
*hbond
, bHaveH
= FALSE
;
220 int i
, j
, nd
, na
, aj
, hisind
, his0
, type
= -1;
221 int nd1
, ne2
, cg
, cd2
, ce1
;
230 gmx_strcasecmp(*pdba
->resinfo
[pdba
->atom
[i
].resind
].name
, "HIS") != 0)
239 /* A histidine residue exists that requires automated assignment, so
240 * doing the analysis of donors and acceptors is worthwhile. */
242 "Analysing hydrogen-bonding network for automated assignment of histidine\n"
246 snew(acceptor
, natom
);
251 for (j
= 0; (j
< natom
); j
++)
253 if (in_strings(*pdba
->atomname
[j
], NPA
, prot_acc
) != -1)
258 if (in_strings(*pdba
->atomname
[j
], NPD
, prot_don
) != -1)
264 fprintf(stderr
, " %d donors and %d acceptors were found.\n", nd
, na
);
265 chk_allhb(pdba
, x
, hb
, donor
, acceptor
, dist
);
268 pr_hbonds(debug
, hb
, pdba
);
270 fprintf(stderr
, "There are %d hydrogen bonds\n", hb
->nra
);
272 /* Now do the HIS stuff */
276 if (gmx_strcasecmp(*pdba
->resinfo
[pdba
->atom
[i
].resind
].name
, "HIS") != 0)
282 if (pdba
->atom
[i
].resind
!= hisind
)
284 hisind
= pdba
->atom
[i
].resind
;
286 /* Find the atoms in the ring */
287 nd1
= ne2
= cg
= cd2
= ce1
= -1;
288 while (i
< natom
&& pdba
->atom
[i
].resind
== hisind
)
290 atomnm
= *pdba
->atomname
[i
];
291 if (strcmp(atomnm
, "CD2") == 0)
295 else if (strcmp(atomnm
, "CG") == 0)
299 else if (strcmp(atomnm
, "CE1") == 0)
303 else if (strcmp(atomnm
, "ND1") == 0)
307 else if (strcmp(atomnm
, "NE2") == 0)
315 if (!((cg
== -1 ) || (cd2
== -1) || (ce1
== -1) ||
316 (nd1
== -1) || (ne2
== -1)))
318 calc_ringh(x
[nd1
], x
[cg
], x
[ce1
], xh1
);
319 calc_ringh(x
[ne2
], x
[ce1
], x
[cd2
], xh2
);
321 bHDd
= chk_hbonds(nd1
, pdba
, x
, acceptor
, hbond
, xh1
, angle
, dist
);
322 chk_hbonds(nd1
, pdba
, x
, donor
, hbond
, xh1
, angle
, dist
);
323 bHEd
= chk_hbonds(ne2
, pdba
, x
, acceptor
, hbond
, xh2
, angle
, dist
);
324 chk_hbonds(ne2
, pdba
, x
, donor
, hbond
, xh2
, angle
, dist
);
341 fprintf(stderr
, "Will use %s for residue %d\n",
342 hh
[type
], pdba
->resinfo
[hisind
].nr
);
346 gmx_fatal(FARGS
, "Incomplete ring in HIS%d",
347 pdba
->resinfo
[hisind
].nr
);
350 snew(pdba
->resinfo
[hisind
].rtp
, 1);
351 *pdba
->resinfo
[hisind
].rtp
= strdup(hh
[type
]);